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Schmalstieg-Bahr K, Gladstone DJ, Hummers E, Suerbaum J, Healey JS, Zapf A, Köster D, Werhahn SM, Wachter R. Biomarkers for predicting atrial fibrillation: An explorative sub-analysis of the randomised SCREEN-AF trial. Eur J Gen Pract 2024; 30:2327367. [PMID: 38497412 PMCID: PMC10949835 DOI: 10.1080/13814788.2024.2327367] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2023] [Accepted: 02/27/2024] [Indexed: 03/19/2024] Open
Abstract
BACKGROUND Atrial fibrillation (AF) is a common treatable risk factor for stroke. Screening for paroxysmal AF in general practice is difficult, but biomarkers might help improve screening strategies. OBJECTIVES We investigated six blood biomarkers for predicting paroxysmal AF in general practice. METHODS This was a pre-specified sub-study of the SCREEN-AF RCT done in Germany. Between 12/2017-03/2019, we enrolled ambulatory individuals aged 75 years or older with a history of hypertension but without known AF. Participants in the intervention group received active AF screening with a wearable patch, continuous ECG monitoring for 2x2 weeks and usual care in the control group. The primary endpoint was ECG-confirmed AF within six months after randomisation. High-sensitive Troponin I (hsTnI), brain natriuretic peptide (BNP), N-terminal pro-B-type natriuretic peptide (NT-pro BNP), N-terminal pro atrial natriuretic peptide (NT-ANP), mid-regional pro atrial natriuretic peptide (MR-pro ANP) and C-reactive protein (CRP) plasma levels were investigated at randomisation for predicting AF within six months after randomisation. RESULTS Blood samples were available for 291 of 301 (96.7%) participants, including 8 with AF (3%). Five biomarkers showed higher median results in AF-patients: BNP 78 vs. 41 ng/L (p = 0.012), NT-pro BNP 273 vs. 186 ng/L (p = 0.029), NT-proANP 4.4 vs. 3.5 nmol/L (p = 0.027), MR-pro ANP 164 vs. 125 pmol/L (p = 0.016) and hsTnI 7.4 vs. 3.9 ng/L (p = 0.012). CRP levels were not different between groups (2.8 vs 1.9 mg/L, p = 0.1706). CONCLUSION Natriuretic peptide levels and hsTnI are higher in patients with AF than without and may help select patients for AF screening, but larger trials are needed.
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Affiliation(s)
- Katharina Schmalstieg-Bahr
- Department of General Practice and Primary Care, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
- Department of General Practice, University Medical Center Göttingen, Göttingen, Germany
| | - David J. Gladstone
- Division of Neurology, Department of Medicine, University of Toronto, Toronto, Ontario, Canada
- Hurvitz Brain Sciences Program, Sunnybrook Research Institute, and Division of Neurology, Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada
| | - Eva Hummers
- Department of General Practice, University Medical Center Göttingen, Göttingen, Germany
- DZHK (German Centre for Cardiovascular Research), Partner Site Göttingen, Göttingen, Germany
| | - Johanna Suerbaum
- DZHK (German Centre for Cardiovascular Research), Partner Site Göttingen, Göttingen, Germany
- Department of Cardiology, University Medical Center Göttingen, Göttingen, Germany
| | - Jeff S. Healey
- Population Health Research Institute, McMaster University, Hamilton, Ontario, Canada
| | - Antonia Zapf
- Institute of Medical Biometry and Epidemiology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Denise Köster
- Institute of Medical Biometry and Epidemiology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Stefanie M. Werhahn
- Department of Cardiology, University Medical Center Göttingen, Göttingen, Germany
| | - Rolf Wachter
- DZHK (German Centre for Cardiovascular Research), Partner Site Göttingen, Göttingen, Germany
- Department of Cardiology, University Medical Center Göttingen, Göttingen, Germany
- Department of Cardiology, University Hospital Leipzig, Leipzig, Germany
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Decker SM, Bruza P, Zhang R, Williams BB, Jarvis LA, Pogue BW, Gladstone DJ. Technical note: Visual, rapid, scintillation point dosimetry for in vivo MV photon beam radiotherapy treatments. Med Phys 2024. [PMID: 38598093 DOI: 10.1002/mp.17071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2023] [Revised: 03/07/2024] [Accepted: 03/26/2024] [Indexed: 04/11/2024] Open
Abstract
BACKGROUND While careful planning and pre-treatment checks are performed to ensure patient safety during external beam radiation therapy (EBRT), inevitable daily variations mean that in vivo dosimetry (IVD) is the only way to attain the true delivered dose. Several countries outside the US require daily IVD for quality assurance. However, elsewhere, the manual labor and time considerations of traditional in vivo dosimeters may be preventing frequent use of IVD in the clinic. PURPOSE This study expands upon previous research using plastic scintillator discs for optical dosimetry for electron therapy treatments. We present the characterization of scintillator discs for in vivo x-ray dosimetry and describe additional considerations due to geometric complexities. METHODS Plastic scintillator discs were coated with reflective white paint on all sides but the front surface. An anti-reflective, matte coating was applied to the transparent face to minimize specular reflection. A time-gated iCMOS camera imaged the discs under various irradiation conditions. In post-processing, background-subtracted images of the scintillators were fit with Gaussian-convolved ellipses to extract several parameters, including integral output, and observation angle. RESULTS Dose linearity and x-ray energy independence were observed, consistent with ideal characteristics for a dosimeter. Dose measurements exhibited less than 5% variation for incident beam angles between 0° and 75° at the anterior surface and 0-60∘ $^\circ $ at the posterior surface for exit beam dosimetry. Varying the angle between the disc surface and the camera lens did not impact the integral output for the same dose up to 55°. Past this point, up to 75°, there is a sharp falloff in response; however, a correction can be used based on the detected width of the disc. The reproducibility of the integral output for a single disc is 2%, and combined with variations from the gantry angle, we report the accuracy of the proposed scintillator disc dosimeters as ±5.4%. CONCLUSIONS Plastic scintillator discs have characteristics that are well-suited for in vivo optical dosimetry for x-ray radiotherapy treatments. Unlike typical point dosimeters, there is no inherent readout time delay, and an optical recording of the measurement is saved after treatment for future reference. While several factors influence the integral output for the same dose, they have been quantified here and may be corrected in post-processing.
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Affiliation(s)
- Savannah M Decker
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire, USA
| | - Petr Bruza
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire, USA
| | - Rongxiao Zhang
- Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire, USA
| | | | - Lesley A Jarvis
- Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire, USA
- Dartmouth Cancer Center, Dartmouth Health, Lebanon, New Hampshire, USA
| | - Brian W Pogue
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire, USA
| | - David J Gladstone
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire, USA
- Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire, USA
- Dartmouth Cancer Center, Dartmouth Health, Lebanon, New Hampshire, USA
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Vasyltsiv R, Rahman M, Harms J, Clark M, Gladstone DJ, Pogue BW, Zhang R, Bruza P. Imaging and characterization of optical emission from ex vivotissue during conventional and UHDR PBS proton therapy. Phys Med Biol 2024; 69:075011. [PMID: 38422545 PMCID: PMC10945384 DOI: 10.1088/1361-6560/ad2ee6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2023] [Revised: 02/21/2024] [Accepted: 02/29/2024] [Indexed: 03/02/2024]
Abstract
Objective. Imaging of optical photons emitted from tissue during radiotherapy is a promising technique for real-time visualization of treatment delivery, offering applications in dose verification, treatment monitoring, and retrospective treatment plan comparison. This research aims to explore the feasibility of intensified imaging of tissue luminescence during proton therapy (PT), under both conventional and ultra-high dose rate (UHDR) conditions.Approach. Conventional and UHDR pencil beam scanning (PBS) PT irradiation of freshex vivoporcine tissue and tissue-mimicking plastic phantom was imaged using intensified complementary metal-oxide-semiconductor(CMOS) cameras. The optical emission from tissue was characterized during conventional irradiation using both blue and red-sensitive intensifiers to ensure adequate spectral coverage. Spectral characterization was performed using bandpass filters between the lens and sensor. Imaging of conventional proton fields (240 MeV, 10 nA) was performed at 100 Hz frame rate, while UHDR PBS proton delivery (250 MeV, 99 nA) was recorded at 1 kHz frame rate. Dependence of optical emission yield on proton energy was studied using an optical tissue-mimicking plastic phantom and a range shifter. Finally, we demonstrated fast beam tracking capability of fast camera towardsin vivomonitoring of FLASH PT.Main results. Under conventional treatment dose rates optical emission was imaged with single spot resolution. Spot profiles were found to agree with the treatment planning system calculation within >90% for all spectral bands and spot intensity was found to vary with spectral filtration. The resultant polychromatic emission presented a maximum intensity at 650 nm and decreasing signal at lower wavelengths, which is consistent with expected attenuation patterns of high fat and muscle tissue. For UHDR beam imaging, optical yield increased with higher proton energy. Imaging at 1 kHz allowed continuous monitoring of delivery during porcine tissue irradiation, with clear identification of individual dwell positions. The number of dwell positions matched the treatment plan in total and per row showing adequate temporal capability of iCMOS imaging.Significance. For the first time, this study characterizes optical emission from tissue during PT and demonstrates our capability of fast optical tracking of pencil proton beam on the tissue anatomy in both conventional and UHDR setting. Similar to the Cherenkov imaging in radiotherapy, this imaging modality could enable a seamless, independent validation of PT treatments.
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Affiliation(s)
- Roman Vasyltsiv
- Thayer School of Engineering, Dartmouth College, Hanover, NH, United States of America
| | - Mahbubur Rahman
- UT Southwestern Medical Center, Dallas, TX, United States of America
| | - Joseph Harms
- Department of Radiation Oncology, University of Alabama at Birmingham, Birmingham, AL, United States of America
| | - Megan Clark
- Thayer School of Engineering, Dartmouth College, Hanover, NH, United States of America
| | - David J Gladstone
- Thayer School of Engineering, Dartmouth College, Hanover, NH, United States of America
| | - Brian W Pogue
- Thayer School of Engineering, Dartmouth College, Hanover, NH, United States of America
- Department of Medical Physics, University of Wisconsin-Madison, Madison, WI, United States of America
| | - Rongxiao Zhang
- Thayer School of Engineering, Dartmouth College, Hanover, NH, United States of America
- Department of Radiation Oncology, New York Medical College, Valhalla, NY, United States of America
| | - Petr Bruza
- Thayer School of Engineering, Dartmouth College, Hanover, NH, United States of America
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Dai T, Sloop AM, Rahman MR, Sunnerberg JP, Clark MA, Young R, Adamczyk S, Von Voigts-Rhetz P, Patane C, Turk M, Jarvis L, Pogue BW, Gladstone DJ, Bruza P, Zhang R. First Monte Carlo beam model for ultra-high dose rate radiotherapy with a compact electron LINAC. Med Phys 2024. [PMID: 38493501 DOI: 10.1002/mp.17031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2023] [Revised: 03/04/2024] [Accepted: 03/04/2024] [Indexed: 03/19/2024] Open
Abstract
BACKGROUND FLASH radiotherapy based on ultra-high dose rate (UHDR) is actively being studied by the radiotherapy community. Dedicated UHDR electron devices are currently a mainstay for FLASH studies. PURPOSE To present the first Monte Carlo (MC) electron beam model for the UHDR capable Mobetron (FLASH-IQ) as a dose calculation and treatment planning platform for preclinical research and FLASH-radiotherapy (RT) clinical trials. METHODS The initial beamline geometry of the Mobetron was provided by the manufacturer, with the first-principal implementation realized in the Geant4-based GAMOS MC toolkit. The geometry and electron source characteristics, such as energy spectrum and beamline parameters, were tuned to match the central-axis percentage depth dose (PDD) and lateral profiles for the pristine beam measured during machine commissioning. The thickness of the small foil in secondary scatter affected the beam model dominantly and was fine tuned to achieve the best agreement with commissioning data. Validation of the MC beam modeling was performed by comparing the calculated PDDs and profiles with EBT-XD radiochromic film measurements for various combinations of applicators and inserts. RESULTS The nominal 9 MeV electron FLASH beams were best represented by a Gaussian energy spectrum with mean energy of 9.9 MeV and variance (σ) of 0.2 MeV. Good agreement between the MC beam model and commissioning data were demonstrated with maximal discrepancy < 3% for PDDs and profiles. Hundred percent gamma pass rate was achieved for all PDDs and profiles with the criteria of 2 mm/3%. With the criteria of 2 mm/2%, maximum, minimum and mean gamma pass rates were (100.0%, 93.8%, 98.7%) for PDDs and (100.0%, 96.7%, 99.4%) for profiles, respectively. CONCLUSIONS A validated MC beam model for the UHDR capable Mobetron is presented for the first time. The MC model can be utilized for direct dose calculation or to generate beam modeling input required for treatment planning systems for FLASH-RT planning. The beam model presented in this work should facilitate translational and clinical FLASH-RT for trials conducted on the Mobetron FLASH-IQ platform.
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Affiliation(s)
- Tianyuan Dai
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire, USA
- Department of Radiation Oncology Physics and Technology, Shandong Cancer Hospital and Institute, Shandong First Medical University and Shandong Academy of Medical Sciences, Jinan, Shandong, China
| | - Austin M Sloop
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire, USA
| | | | - Jacob P Sunnerberg
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire, USA
| | - Megan A Clark
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire, USA
| | - Ralph Young
- IntraOp Medical Corporation, Sunnyvale, California, USA
| | | | | | - Chris Patane
- IntraOp Medical Corporation, Sunnyvale, California, USA
| | - Michael Turk
- IntraOp Medical Corporation, Sunnyvale, California, USA
| | - Lesley Jarvis
- Department of Medicine, Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire, USA
- Dartmouth Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire, USA
| | - Brian W Pogue
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire, USA
- Dartmouth Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire, USA
- Department of Medical Physics, Wisconsin Institutes for Medical Research, University of Wisconsin, Madison, Wisconsin, USA
| | - David J Gladstone
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire, USA
- Department of Medicine, Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire, USA
- Dartmouth Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire, USA
| | - Petr Bruza
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire, USA
| | - Rongxiao Zhang
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire, USA
- Department of Medicine, Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire, USA
- Department of Radiation Medicine, New York Medical College, Valhalla, New York, USA
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5
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Sajobi TT, Arimoro OI, Ademola A, Singh N, Bala F, Almekhlafi MA, Deschaintre Y, Coutts SB, Thirunavukkarasu S, Khosravani H, Appireddy R, Moreau F, Gubitz GJ, Tkach A, Catanese L, Dowlatshahi D, Medvedev G, Mandzia J, Pikula A, Shankar JS, Williams H, Field TS, Manosalva A, Siddiqui M, Zafar A, Imoukhuede O, Hunter G, Demchuk AM, Mishra SM, Gioia LC, Jalini S, Cayer C, Phillips SJ, Elamin E, Shoamanesh A, Subramaniam S, Kate MP, Jacquin G, Camden MC, Benali F, Alhabli I, Horn M, Stotts G, Hill MD, Gladstone DJ, Poppe AY, Sehgal A, Zhang Q, Lethebe B, Doram C, Shamy M, Kenney C, Buck BH, Swartz RH, Menon BK. Quality of Life After Intravenous Thrombolysis for Acute Ischemic Stroke: Results From the AcT Randomized Controlled Trial. Stroke 2024; 55:524-531. [PMID: 38275116 DOI: 10.1161/strokeaha.123.044690] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Accepted: 11/30/2023] [Indexed: 01/27/2024]
Abstract
BACKGROUND Recent evidence from thrombolysis trials indicates the noninferiority of intravenous tenecteplase to intravenous alteplase with respect to good functional outcomes in patients with acute stroke. We examined whether the health-related quality of life (HRQOL) of patients with acute stroke differs by the type of thrombolysis treatment received. In addition, we examined the association between the modified Rankin Scale score 0 to 1 and HRQOL and patient-reported return to prebaseline stroke functioning at 90 days. METHODS Data were from all patients included in the AcT trial (Alteplase Compared to Tenecteplase), a pragmatic, registry-linked randomized trial comparing tenecteplase with alteplase. HRQOL at 90-day post-randomization was assessed using the 5-item EuroQOL questionnaire (EQ5D), which consists of 5 items and a visual analog scale (VAS). EQ5D index values were estimated from the EQ5D items using the time tradeoff approach based on Canadian norms. Tobit regression and quantile regression models were used to evaluate the adjusted effect of tenecteplase versus alteplase treatment on the EQ5D index values and VAS score, respectively. The association between return to prebaseline stroke functioning and the modified Rankin Scale score 0 to 1 and HRQOL was quantified using correlation coefficient (r) with 95% CI. RESULTS Of 1577 included in the intention-to-treat analysis patients, 1503 (95.3%) had complete data on the EQ5D. Of this, 769 (51.2%) were administered tenecteplase and 717 (47.7%) were female. The mean EQ5D VAS score and EQ5D index values were not significantly higher for those who received intravenous tenecteplase compared with those who received intravenous alteplase (P=0.10). Older age (P<0.01), more severe stroke assessed using the National Institutes of Health Stroke Scale (P<0.01), and longer stroke onset-to-needle time (P=0.004) were associated with lower EQ5D index and VAS scores. There was a strong association (r, 0.85 [95% CI, 0.81-0.89]) between patient-reported return to prebaseline functioning and modified Rankin Scale score 0 to 1 Similarly, there was a moderate association between return to prebaseline functioning and EQ5D index (r, 0.45 [95% CI, 0.40-0.49]) and EQ5D VAS scores (r, 0.42 [95% CI, 0.37-0.46]). CONCLUSIONS Although there is no differential effect of thrombolysis type on patient-reported global HRQOL and EQ 5D-5L index values in patients with acute stroke, sex- and age-related differences in HRQOL were noted in this study. REGISTRATION URL: https://www.clinicaltrials.gov; Unique identifier: NCT03889249.
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Affiliation(s)
- Tolulope T Sajobi
- Department of Community Health Sciences, University of Calgary, AB, Canada (T.T.S., O.I.A., A.A., M.A.A., S.B.C., A.M.D., M.D.H., B.L., B.K.M.)
- Department of Clinical Neurosciences (T.T.S., A.A., M.A.A., S.B.C., A.M.D., S.S., F. Benali, I.A., M.H., M.D.H., A. Sehgal, Q.Z., C.D., C.K., B.K.M.), Cumming School of Medicine, University of Calgary, AB, Canada
| | - Olayinka I Arimoro
- Department of Community Health Sciences, University of Calgary, AB, Canada (T.T.S., O.I.A., A.A., M.A.A., S.B.C., A.M.D., M.D.H., B.L., B.K.M.)
| | - Ayoola Ademola
- Department of Community Health Sciences, University of Calgary, AB, Canada (T.T.S., O.I.A., A.A., M.A.A., S.B.C., A.M.D., M.D.H., B.L., B.K.M.)
- Department of Clinical Neurosciences (T.T.S., A.A., M.A.A., S.B.C., A.M.D., S.S., F. Benali, I.A., M.H., M.D.H., A. Sehgal, Q.Z., C.D., C.K., B.K.M.), Cumming School of Medicine, University of Calgary, AB, Canada
| | - Nishita Singh
- Max Rady College of Medicine, University of Manitoba, Winnipeg, Canada (N.S., J.S.S.)
- University of Manitoba, Winnipeg, Canada (N.S., J.S.S.)
| | - Fouzi Bala
- Department of Diagnostic and Interventional Neuroradiology, Tours University Hospital, France (F. Bala)
| | - Mohammed A Almekhlafi
- Department of Community Health Sciences, University of Calgary, AB, Canada (T.T.S., O.I.A., A.A., M.A.A., S.B.C., A.M.D., M.D.H., B.L., B.K.M.)
- Department of Clinical Neurosciences (T.T.S., A.A., M.A.A., S.B.C., A.M.D., S.S., F. Benali, I.A., M.H., M.D.H., A. Sehgal, Q.Z., C.D., C.K., B.K.M.), Cumming School of Medicine, University of Calgary, AB, Canada
- Department of Radiology (M.A.A., S.B.C., A.M.D., M.D.H., B.K.M.), Cumming School of Medicine, University of Calgary, AB, Canada
- Hotchkiss Brain Institute, Calgary, AB, Canada (M.A.A., S.B.C., A.M.D., M.D.H., B.K.M.)
| | - Yan Deschaintre
- Département of Neurosciences, Université de Montréal, QC, Canada (Y.D., L.C.G., G.J., A.Y.P.)
- Centre Hospitalier de l'Université de Montréal, QC, Canada (Y.D., L.C.G., G.J., A.Y.P.)
| | - Shelagh B Coutts
- Department of Community Health Sciences, University of Calgary, AB, Canada (T.T.S., O.I.A., A.A., M.A.A., S.B.C., A.M.D., M.D.H., B.L., B.K.M.)
- Department of Clinical Neurosciences (T.T.S., A.A., M.A.A., S.B.C., A.M.D., S.S., F. Benali, I.A., M.H., M.D.H., A. Sehgal, Q.Z., C.D., C.K., B.K.M.), Cumming School of Medicine, University of Calgary, AB, Canada
- Department of Radiology (M.A.A., S.B.C., A.M.D., M.D.H., B.K.M.), Cumming School of Medicine, University of Calgary, AB, Canada
- Hotchkiss Brain Institute, Calgary, AB, Canada (M.A.A., S.B.C., A.M.D., M.D.H., B.K.M.)
| | - Sibi Thirunavukkarasu
- Division of Neurology, Department of Medicine, University of Alberta, Edmonton, Canada (S.T., S.M.M., M.P.K., B.H.B.)
| | - Houman Khosravani
- Division of Neurology, Department of Medicine, Hurvitz Brain Sciences Program, Sunnybrook Health Sciences Centre, University of Toronto, ON, Canada (H.K., D.J.G., R.H.S.)
| | - Ramana Appireddy
- Division of Neurology, Department of Medicine, Queen's University, Kingston, ON, Canada (R.A., S.J.)
| | | | - Gordon J Gubitz
- Queen Elizabeth Health Sciences Centre, Halifax, NS, Canada (G.J.G., S.J.P., A. Shoamanesh)
| | | | - Luciana Catanese
- Hamilton Health Sciences Centre, McMaster University, Hamilton, ON, Canada (L.C.)
| | - Dar Dowlatshahi
- Department of Medicine, Ottawa Heart Research Institute, University of Ottawa, ON, Canada (D.D., M. Shamy)
| | - George Medvedev
- Department of Medicine, University of British Columbia & Fraser Health Authority, New Westminster, BC, Canada (G.M., G.S.)
- University of British Columbia, Fraser Health Authority, New Westminster, BC, Canada (G.M., G.S.)
| | - Jennifer Mandzia
- London Health Sciences Centre and Western University, ON, Canada (J.M.)
| | | | - Jai Shiva Shankar
- Max Rady College of Medicine, University of Manitoba, Winnipeg, Canada (N.S., J.S.S.)
- University of Manitoba, Winnipeg, Canada (N.S., J.S.S.)
| | | | - Thalia S Field
- Vancouver Stroke Program, Division of Neurology, The University of British Columbia, Vancouver, Canada (T.S.F.)
| | | | | | - Atif Zafar
- St. Michael's Hospital, Toronto, ON, Canada (A.Z.)
| | | | - Gary Hunter
- University of Saskatchewan, Saskatoon, Canada (G.H.)
| | - Andrew M Demchuk
- Department of Community Health Sciences, University of Calgary, AB, Canada (T.T.S., O.I.A., A.A., M.A.A., S.B.C., A.M.D., M.D.H., B.L., B.K.M.)
- Department of Clinical Neurosciences (T.T.S., A.A., M.A.A., S.B.C., A.M.D., S.S., F. Benali, I.A., M.H., M.D.H., A. Sehgal, Q.Z., C.D., C.K., B.K.M.), Cumming School of Medicine, University of Calgary, AB, Canada
- Department of Radiology (M.A.A., S.B.C., A.M.D., M.D.H., B.K.M.), Cumming School of Medicine, University of Calgary, AB, Canada
| | - Sachin M Mishra
- Hotchkiss Brain Institute, Calgary, AB, Canada (M.A.A., S.B.C., A.M.D., M.D.H., B.K.M.)
- Division of Neurology, Department of Medicine, University of Alberta, Edmonton, Canada (S.T., S.M.M., M.P.K., B.H.B.)
| | - Laura C Gioia
- Département of Neurosciences, Université de Montréal, QC, Canada (Y.D., L.C.G., G.J., A.Y.P.)
- Centre Hospitalier de l'Université de Montréal, QC, Canada (Y.D., L.C.G., G.J., A.Y.P.)
| | - Shirin Jalini
- Division of Neurology, Department of Medicine, Queen's University, Kingston, ON, Canada (R.A., S.J.)
| | - Caroline Cayer
- Centre de recherche du CHUS, Centre intégré Universitaire de Santé et des Services Sociaux de l'Estrie, Sherbrooke, QC, Canada (C.C.)
| | - Stephen J Phillips
- Queen Elizabeth Health Sciences Centre, Halifax, NS, Canada (G.J.G., S.J.P., A. Shoamanesh)
| | | | - Ashkan Shoamanesh
- Queen Elizabeth Health Sciences Centre, Halifax, NS, Canada (G.J.G., S.J.P., A. Shoamanesh)
| | - Suresh Subramaniam
- Department of Clinical Neurosciences (T.T.S., A.A., M.A.A., S.B.C., A.M.D., S.S., F. Benali, I.A., M.H., M.D.H., A. Sehgal, Q.Z., C.D., C.K., B.K.M.), Cumming School of Medicine, University of Calgary, AB, Canada
| | - Mahesh P Kate
- Division of Neurology, Department of Medicine, University of Alberta, Edmonton, Canada (S.T., S.M.M., M.P.K., B.H.B.)
| | - Gregory Jacquin
- Département of Neurosciences, Université de Montréal, QC, Canada (Y.D., L.C.G., G.J., A.Y.P.)
- Centre Hospitalier de l'Université de Montréal, QC, Canada (Y.D., L.C.G., G.J., A.Y.P.)
| | - Marie-Christine Camden
- Enfant-Jésus Hospital, Centre Hospitalier Universitaire de Québec, Laval University, Canada (M.-C.C.)
| | - Faysal Benali
- Department of Clinical Neurosciences (T.T.S., A.A., M.A.A., S.B.C., A.M.D., S.S., F. Benali, I.A., M.H., M.D.H., A. Sehgal, Q.Z., C.D., C.K., B.K.M.), Cumming School of Medicine, University of Calgary, AB, Canada
| | - Ibrahim Alhabli
- Department of Clinical Neurosciences (T.T.S., A.A., M.A.A., S.B.C., A.M.D., S.S., F. Benali, I.A., M.H., M.D.H., A. Sehgal, Q.Z., C.D., C.K., B.K.M.), Cumming School of Medicine, University of Calgary, AB, Canada
| | - MacKenzie Horn
- Department of Clinical Neurosciences (T.T.S., A.A., M.A.A., S.B.C., A.M.D., S.S., F. Benali, I.A., M.H., M.D.H., A. Sehgal, Q.Z., C.D., C.K., B.K.M.), Cumming School of Medicine, University of Calgary, AB, Canada
| | - Grant Stotts
- Department of Medicine, University of British Columbia & Fraser Health Authority, New Westminster, BC, Canada (G.M., G.S.)
- University of British Columbia, Fraser Health Authority, New Westminster, BC, Canada (G.M., G.S.)
| | - Michael D Hill
- Department of Community Health Sciences, University of Calgary, AB, Canada (T.T.S., O.I.A., A.A., M.A.A., S.B.C., A.M.D., M.D.H., B.L., B.K.M.)
- Department of Clinical Neurosciences (T.T.S., A.A., M.A.A., S.B.C., A.M.D., S.S., F. Benali, I.A., M.H., M.D.H., A. Sehgal, Q.Z., C.D., C.K., B.K.M.), Cumming School of Medicine, University of Calgary, AB, Canada
- Department of Radiology (M.A.A., S.B.C., A.M.D., M.D.H., B.K.M.), Cumming School of Medicine, University of Calgary, AB, Canada
- Hotchkiss Brain Institute, Calgary, AB, Canada (M.A.A., S.B.C., A.M.D., M.D.H., B.K.M.)
| | - David J Gladstone
- Division of Neurology, Department of Medicine, Hurvitz Brain Sciences Program, Sunnybrook Health Sciences Centre, University of Toronto, ON, Canada (H.K., D.J.G., R.H.S.)
| | - Alexandre Y Poppe
- Département of Neurosciences, Université de Montréal, QC, Canada (Y.D., L.C.G., G.J., A.Y.P.)
- Centre Hospitalier de l'Université de Montréal, QC, Canada (Y.D., L.C.G., G.J., A.Y.P.)
| | - Arshia Sehgal
- Department of Clinical Neurosciences (T.T.S., A.A., M.A.A., S.B.C., A.M.D., S.S., F. Benali, I.A., M.H., M.D.H., A. Sehgal, Q.Z., C.D., C.K., B.K.M.), Cumming School of Medicine, University of Calgary, AB, Canada
| | - Qiao Zhang
- Department of Clinical Neurosciences (T.T.S., A.A., M.A.A., S.B.C., A.M.D., S.S., F. Benali, I.A., M.H., M.D.H., A. Sehgal, Q.Z., C.D., C.K., B.K.M.), Cumming School of Medicine, University of Calgary, AB, Canada
| | - Brendan Lethebe
- Department of Community Health Sciences, University of Calgary, AB, Canada (T.T.S., O.I.A., A.A., M.A.A., S.B.C., A.M.D., M.D.H., B.L., B.K.M.)
| | - Craig Doram
- Department of Clinical Neurosciences (T.T.S., A.A., M.A.A., S.B.C., A.M.D., S.S., F. Benali, I.A., M.H., M.D.H., A. Sehgal, Q.Z., C.D., C.K., B.K.M.), Cumming School of Medicine, University of Calgary, AB, Canada
| | - Michel Shamy
- Department of Medicine, Ottawa Heart Research Institute, University of Ottawa, ON, Canada (D.D., M. Shamy)
| | - Carol Kenney
- Department of Clinical Neurosciences (T.T.S., A.A., M.A.A., S.B.C., A.M.D., S.S., F. Benali, I.A., M.H., M.D.H., A. Sehgal, Q.Z., C.D., C.K., B.K.M.), Cumming School of Medicine, University of Calgary, AB, Canada
| | - Brian H Buck
- Division of Neurology, Department of Medicine, University of Alberta, Edmonton, Canada (S.T., S.M.M., M.P.K., B.H.B.)
| | - Richard H Swartz
- Division of Neurology, Department of Medicine, Hurvitz Brain Sciences Program, Sunnybrook Health Sciences Centre, University of Toronto, ON, Canada (H.K., D.J.G., R.H.S.)
| | - Bijoy K Menon
- Department of Community Health Sciences, University of Calgary, AB, Canada (T.T.S., O.I.A., A.A., M.A.A., S.B.C., A.M.D., M.D.H., B.L., B.K.M.)
- Department of Clinical Neurosciences (T.T.S., A.A., M.A.A., S.B.C., A.M.D., S.S., F. Benali, I.A., M.H., M.D.H., A. Sehgal, Q.Z., C.D., C.K., B.K.M.), Cumming School of Medicine, University of Calgary, AB, Canada
- Department of Radiology (M.A.A., S.B.C., A.M.D., M.D.H., B.K.M.), Cumming School of Medicine, University of Calgary, AB, Canada
- Hotchkiss Brain Institute, Calgary, AB, Canada (M.A.A., S.B.C., A.M.D., M.D.H., B.K.M.)
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6
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Kamel H, Longstreth WT, Tirschwell DL, Kronmal RA, Marshall RS, Broderick JP, Aragón García R, Plummer P, Sabagha N, Pauls Q, Cassarly C, Dillon CR, Di Tullio MR, Hod EA, Soliman EZ, Gladstone DJ, Healey JS, Sharma M, Chaturvedi S, Janis LS, Krishnaiah B, Nahab F, Kasner SE, Stanton RJ, Kleindorfer DO, Starr M, Winder TR, Clark WM, Miller BR, Elkind MSV. Apixaban to Prevent Recurrence After Cryptogenic Stroke in Patients With Atrial Cardiopathy: The ARCADIA Randomized Clinical Trial. JAMA 2024; 331:573-581. [PMID: 38324415 PMCID: PMC10851142 DOI: 10.1001/jama.2023.27188] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Accepted: 12/13/2023] [Indexed: 02/09/2024]
Abstract
Importance Atrial cardiopathy is associated with stroke in the absence of clinically apparent atrial fibrillation. It is unknown whether anticoagulation, which has proven benefit in atrial fibrillation, prevents stroke in patients with atrial cardiopathy and no atrial fibrillation. Objective To compare anticoagulation vs antiplatelet therapy for secondary stroke prevention in patients with cryptogenic stroke and evidence of atrial cardiopathy. Design, Setting, and Participants Multicenter, double-blind, phase 3 randomized clinical trial of 1015 participants with cryptogenic stroke and evidence of atrial cardiopathy, defined as P-wave terminal force greater than 5000 μV × ms in electrocardiogram lead V1, serum N-terminal pro-B-type natriuretic peptide level greater than 250 pg/mL, or left atrial diameter index of 3 cm/m2 or greater on echocardiogram. Participants had no evidence of atrial fibrillation at the time of randomization. Enrollment and follow-up occurred from February 1, 2018, through February 28, 2023, at 185 sites in the National Institutes of Health StrokeNet and the Canadian Stroke Consortium. Interventions Apixaban, 5 mg or 2.5 mg, twice daily (n = 507) vs aspirin, 81 mg, once daily (n = 508). Main Outcomes and Measures The primary efficacy outcome in a time-to-event analysis was recurrent stroke. All participants, including those diagnosed with atrial fibrillation after randomization, were analyzed according to the groups to which they were randomized. The primary safety outcomes were symptomatic intracranial hemorrhage and other major hemorrhage. Results With 1015 of the target 1100 participants enrolled and mean follow-up of 1.8 years, the trial was stopped for futility after a planned interim analysis. The mean (SD) age of participants was 68.0 (11.0) years, 54.3% were female, and 87.5% completed the full duration of follow-up. Recurrent stroke occurred in 40 patients in the apixaban group (annualized rate, 4.4%) and 40 patients in the aspirin group (annualized rate, 4.4%) (hazard ratio, 1.00 [95% CI, 0.64-1.55]). Symptomatic intracranial hemorrhage occurred in 0 patients taking apixaban and 7 patients taking aspirin (annualized rate, 1.1%). Other major hemorrhages occurred in 5 patients taking apixaban (annualized rate, 0.7%) and 5 patients taking aspirin (annualized rate, 0.8%) (hazard ratio, 1.02 [95% CI, 0.29-3.52]). Conclusions and Relevance In patients with cryptogenic stroke and evidence of atrial cardiopathy without atrial fibrillation, apixaban did not significantly reduce recurrent stroke risk compared with aspirin. Trial Registration ClinicalTrials.gov Identifier: NCT03192215.
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Affiliation(s)
- Hooman Kamel
- Clinical and Translational Neuroscience Unit, Department of Neurology and Feil Family Brain and Mind Research Institute, Weill Cornell Medicine, New York, New York
| | - W. T. Longstreth
- Department of Neurology, University of Washington, Seattle
- Department of Medicine, University of Washington, Seattle
- Department of Epidemiology, University of Washington, Seattle
| | | | | | - Randolph S. Marshall
- Department of Neurology, Vagelos College of Physicians and Surgeons, Columbia University, New York, New York
| | - Joseph P. Broderick
- Department of Neurology and Rehabilitation Medicine, University of Cincinnati College of Medicine, Cincinnati, Ohio
| | - Rebeca Aragón García
- Department of Neurology, Vagelos College of Physicians and Surgeons, Columbia University, New York, New York
| | - Pamela Plummer
- Department of Neurology and Rehabilitation Medicine, University of Cincinnati College of Medicine, Cincinnati, Ohio
| | - Noor Sabagha
- Department of Neurology and Rehabilitation Medicine, University of Cincinnati College of Medicine, Cincinnati, Ohio
| | - Qi Pauls
- Department of Public Health Sciences, Medical University of South Carolina, Charleston
| | - Christy Cassarly
- Department of Public Health Sciences, Medical University of South Carolina, Charleston
| | - Catherine R. Dillon
- Department of Public Health Sciences, Medical University of South Carolina, Charleston
| | - Marco R. Di Tullio
- Division of Cardiology, Vagelos College of Physicians and Surgeons, Columbia University, New York, New York
| | - Eldad A. Hod
- Department of Pathology, Vagelos College of Physicians and Surgeons, Columbia University, New York, New York
| | - Elsayed Z. Soliman
- Epidemiological Cardiology Research Center, Department of Internal Medicine, Wake Forest School of Medicine, Winston-Salem, North Carolina
| | - David J. Gladstone
- Sunnybrook Research Institute, Hurvitz Brain Sciences Program, Sunnybrook Health Sciences Centre, and Division of Neurology, Department of Medicine, University of Toronto, Toronto, Ontario, Canada
| | - Jeff S. Healey
- Population Health Research Institute, McMaster University, Hamilton, Ontario, Canada
| | - Mukul Sharma
- Population Health Research Institute, McMaster University, Hamilton, Ontario, Canada
| | - Seemant Chaturvedi
- Department of Neurology, University of Maryland, and Baltimore VA Hospital, Baltimore
| | - L. Scott Janis
- National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland
| | - Balaji Krishnaiah
- Department of Neurology, University of Tennessee Health Sciences Center, Memphis
| | - Fadi Nahab
- Departments of Neurology and Pediatrics, Emory University, Atlanta, Georgia
| | - Scott E. Kasner
- Department of Neurology, Perelman School of Medicine, University of Pennsylvania, Philadelphia
| | - Robert J. Stanton
- Department of Neurology and Rehabilitation Medicine, University of Cincinnati College of Medicine, Cincinnati, Ohio
| | | | - Matthew Starr
- Department of Neurology, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania
| | | | - Wayne M. Clark
- Department of Neurology, Oregon Health & Science University, Portland
| | | | - Mitchell S. V. Elkind
- Department of Neurology, Vagelos College of Physicians and Surgeons, Columbia University, New York, New York
- Department of Epidemiology, Mailman School of Public Health, Columbia University, New York, New York
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7
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Thomas W, Sunnerberg J, Reed M, Gladstone DJ, Zhang R, Harms J, Swartz HM, Pogue BW. Proton and Electron Ultrahigh-Dose-Rate Isodose Irradiations Produce Differences in Reactive Oxygen Species Yields. Int J Radiat Oncol Biol Phys 2024; 118:262-267. [PMID: 37558097 PMCID: PMC10843497 DOI: 10.1016/j.ijrobp.2023.07.042] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2023] [Revised: 07/10/2023] [Accepted: 07/29/2023] [Indexed: 08/11/2023]
Abstract
Purpose: Investigations into ultra-high dose rate (UHDR) radiotherapy have dramatically risen because of the observed normal tissue sparing FLASH effect without sacrificing tumor control. The purpose of this study was to provide a direct beamline comparison of protons and electrons to determine where UHDR to conventional dose rates (CDR) changes affect the resultant radiochemistry. Methods and Materials: We used well characterized assays of reactive oxygen species (ROS) and oxygen consumption to assess the radiolysis in protein solutions. Three optical reporters related to ROS (CellROX Deep Red, reflects highly reactive radicals; Amplex Red reflects H2O2; and Oxyphor reflects partial pressure loss (ΔpO2)). A Varian ProBeam proton cyclotron and a converted Varian Trilogy electron linac were used for irradiation at both their CDR and UHDR capable level, to assess the assay change per unit dose. Results: For both protons and electrons an expected reduction in ROS was noted going from CDR to UHDR, and results interpreted as a reduction in the ratio of UHDR/CDR yield. The CellROX assay showed no difference between beamlines, each showing ~80% reduction in ROS from CDR to UHDR. The Amplex assay showed the largest inter-beamline difference, with ~5% loss using protons vs ~69% loss with electrons, in protein solution. The Oxyphor assay of ΔpO2 showed a small difference in CDR to UHDR with a 23% loss with protons and 43% loss with electrons. Conclusion: Interpretation of ROS assays and oxygen consumption is notoriously challenging. These assays might be interpreted by their most activating species’ lifetime. The assay for highly reactive OH●, appeared independent of beamline, whereas the assays for the longer lived H2O2 species and ΔpO2 assay showed differences between beamlines via the UHDR/CDR ratio. This work can be used for FLASH hypothesis testing by comparing these assays to isodose biological FLASH effects in vivo.
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Affiliation(s)
- William Thomas
- Department of Medical Physics, University of Wisconsin-Madison, Madison, Wisconsin
| | - Jacob Sunnerberg
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire
| | - Matthew Reed
- Department of Medical Physics, University of Wisconsin-Madison, Madison, Wisconsin
| | - David J Gladstone
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire; Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire
| | - Rongxiao Zhang
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire; Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire
| | - Joseph Harms
- Department of Radiation Oncology, University of Alabama at Birmingham, Birmingham, Alabama
| | - Harold M Swartz
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire; Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire
| | - Brian W Pogue
- Department of Medical Physics, University of Wisconsin-Madison, Madison, Wisconsin; Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire.
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8
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Tavakkoli AD, Clark MA, Kheirollah A, Sloop AM, Soderholm HE, Daniel NJ, Petusseau AF, Huang YH, Thomas CR, Jarvis LA, Zhang R, Pogue BW, Gladstone DJ, Hoopes PJ. Anesthetic oxygen use and sex are critical factors in the FLASH sparing effect. bioRxiv 2023:2023.11.04.565626. [PMID: 37961549 PMCID: PMC10635148 DOI: 10.1101/2023.11.04.565626] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2023]
Abstract
Introduction Ultra-high dose-rate (UHDR) radiation has been reported to spare normal tissue compared to conventional dose-rate (CDR) radiation. However, reproducibility of the FLASH effect remains challenging due to varying dose ranges, radiation beam structure, and in-vivo endpoints. A better understanding of these inconsistencies may shed light on the mechanism of FLASH sparing. Here, we evaluate whether sex and/or use of 100% oxygen as carrier gas during irradiation contribute to the variability of the FLASH effect. Methods C57BL/6 mice (24 male, 24 female) were anesthetized using isoflurane mixed with either room air or 100% oxygen. Subsequently, the mice received 27 Gy of either 9 MeV electron UHDR or CDR to a 1.6 cm2 diameter area of the right leg skin using the Mobetron linear accelerator. The primary post-radiation endpoint was time to full thickness skin ulceration. In a separate cohort of mice (4 male, 4 female) skin oxygenation was measured using PdG4 Oxyphor under identical anesthesia conditions. Results In the UHDR group, time to ulceration was significantly shorter in mice that received 100% oxygen compared to room air, and amongst them female mice ulcerated sooner compared to males. However, no significant difference was observed between male and female UHDR mice that received room air. Oxygen measurements showed significantly higher tissue oxygenation using 100% oxygen as the anesthesia carrier gas compared to room air, and female mice showed higher levels of tissue oxygenation compared to males under 100% oxygen. Conclusion The FLASH sparing effect is significantly reduced using oxygen during anesthesia compared to room air. The FLASH sparing was significantly lower in female mice compared to males. Both tissue oxygenation and sex are likely sources of variability in UHDR studies. These results suggest an oxygen-based mechanism for FLASH, as well as a key role for sex in the FLASH skin sparing effect.
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Affiliation(s)
| | | | | | | | | | | | | | | | - Charles R. Thomas
- Department of Radiation Oncology, Dartmouth-Hitchcock Medical Center
| | - Lesley A. Jarvis
- Department of Radiation Oncology, Dartmouth-Hitchcock Medical Center
| | - Rongxiao Zhang
- Department of Radiation Medicine, New York Medical College
| | - Brian W. Pogue
- Department of Medical Physics, University of Wisconsin School of Medicine
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9
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Pogue BW, Decker SM, Zhang R, Bruza P, Gladstone DJ, Jarvis LA. Cherenkov and Plan Integration for Real-Time Delivery Verification: The Opportunity for Automated Visualization and Guidance of All Treatments in EBRT. Int J Radiat Oncol Biol Phys 2023; 117:e706. [PMID: 37786068 DOI: 10.1016/j.ijrobp.2023.06.2198] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/04/2023]
Abstract
PURPOSE/OBJECTIVE(S) Initiatives in the national radiation oncology incident learning system (RO-ILS) have been exceptionally useful in discovery of factors that lead to incidents and learning of best practices that can help make the national practice of RO safer as a whole. Incident learning systems come from the flight industry, where both visual cues and instrument control are essential parts of implementation, and similarly both human and instrument tools are used in RO. However, numerous RO studies have reported that human factors are a leading cause of incidents discovered and that timelines, such as QA, setup, delivery, and verification are areas where most incidents are found. Tools such as Cherenkov imaging and SGRT can be used to automate many of the riskiest human decisions and/or providing both human vision and instrument-guided oversight in these areas of treatment delivery process. MATERIALS/METHODS The value of continuous online imaging is reviewed and the two parts have been tested towards complete automation. The conceptual framework of comparing images to the patient treatment plan is outlined with software examples. Development towards a combined SGRT & Cherenkov imaging system that could achieve fully automated incident detection is outlined. RESULTS Cherenkov imaging has shown direct visualization of many instances of beam delivery to patients that were sub-optimal. These are seen mostly in isolated cases of normal tissue in the beam where it was not expected, such as limbs, chin, contralateral breast or axilla. Incorrect placement of bolus is also readily visualized. Comparisons can be made on a day-to-day basis, but also on a delivery to plan basis if the plan was incorporated into the treatment delivery process. Analysis of the incidents seen indicates that there are automatable metrics of image quality that could have detected them. Overall, if the system detection of variations were fully automated, these could be detected without human intervention. CONCLUSION The capabilities for reducing nearly all human error in setup and delivery are available or emerging, and Cherenkov imaging is perhaps one of the most direct ways to capture and computationally analyze the treatment in real time. These tools require further integration with automated analysis and plan integration, but the initial steps are well underway and individual parts are now possible with advances in R&D of the system integration.
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Affiliation(s)
- B W Pogue
- University of Wisconsin-Madison, Madison, WI
| | - S M Decker
- Thayer School of Engineering, Dartmouth College, Hanover, NH
| | - R Zhang
- Thayer School of Engineering, Dartmouth College, Hanover, NH
| | - P Bruza
- Thayer School of Engineering, Dartmouth College, Hanover, NH
| | - D J Gladstone
- Thayer School of Engineering, Dartmouth College, Hanover, NH
| | - L A Jarvis
- Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, NH
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10
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Rahman M, Kozelka J, Hildreth J, Schönfeld A, Sloop AM, Ashraf MR, Bruza P, Gladstone DJ, Pogue BW, Simon WE, Zhang R. Characterization of a diode dosimeter for UHDR FLASH radiotherapy. Med Phys 2023; 50:5875-5883. [PMID: 37249058 DOI: 10.1002/mp.16474] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2022] [Revised: 04/17/2023] [Accepted: 04/18/2023] [Indexed: 05/31/2023] Open
Abstract
BACKGROUND Ultra-high dose rate (UHDR) FLASH beams typically deliver dose at rates of >40 Gy/sec. Characterization of these beams with respect to dose, mean dose rate, and dose per pulse requires dosimeters which exhibit high temporal resolution and fast readout capabilities. PURPOSE A diode EDGE Detector with a newly designed electrometer has been characterized for use in an UHDR electron beam and demonstrated appropriateness for UHDR FLASH radiotherapy dosimetry. METHODS Dose linearity, mean dose rate, and dose per pulse dependencies of the EDGE Detector were quantified and compared with dosimeters including a W1 scintillator detector, radiochromic film, and ionization chamber that were irradiated with a 10 MeV UHDR beam. The dose, dose rate, and dose per pulse were controlled via an in-house developed scintillation-based feedback mechanism, repetition rate of the linear accelerator, and source-to-surface distance, respectively. Depth-dose profiles and temporal profiles at individual pulse resolution were compared to the film and scintillation measurements, respectively. The radiation-induced change in response sensitivity was quantified via irradiation of ∼5kGy. RESULTS The EDGE Detector agreed with film measurements in the measured range with varying dose (up to 70 Gy), dose rate (nearly 200 Gy/s), and dose per pulse (up to 0.63 Gy/pulse) on average to within 2%, 5%, and 1%, respectively. The detector also agreed with W1 scintillation detector on average to within 2% for dose per pulse (up to 0.78 Gy/pulse). The EDGE Detector signal was proportional to ion chamber (IC) measured dose, and mean dose rate in the bremsstrahlung tail to within 0.4% and 0.2% respectively. The EDGE Detector measured percent depth dose (PDD) agreed with film to within 3% and per pulse output agreed with W1 scintillator to within -6% to +5%. The radiation-induced response decrease was 0.4% per kGy. CONCLUSIONS The EDGE Detector demonstrated dose linearity, mean dose rate independence, and dose per pulse independence for UHDR electron beams. It can quantify the beam spatially, and temporally at sub millisecond resolution. It's robustness and individual pulse detectability of treatment deliveries can potentially lead to its implementation for in vivo FLASH dosimetry, and dose monitoring.
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Affiliation(s)
- Mahbubur Rahman
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire, USA
- UT Southwestern Medical Center, Dallas, Texas, USA
| | | | | | | | - Austin M Sloop
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire, USA
| | - M Ramish Ashraf
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire, USA
- Stanford University, Stanford, California, USA
| | - Petr Bruza
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire, USA
| | - David J Gladstone
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire, USA
- Department of Medicine, Radiation Oncology, Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire, USA
- Dartmouth Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire, USA
| | - Brian W Pogue
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire, USA
- Dartmouth Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire, USA
- Department of Surgery, Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire, USA
- Department of Medical Physics, Wisconsin Institutes for Medical Research, University of Wisconsin, Madison, Wisconsin, USA
| | | | - Rongxiao Zhang
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire, USA
- Department of Medicine, Radiation Oncology, Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire, USA
- Department of Radiation Medicine, Westchester Medical Center, New York Medical College,Valhalla, New York, USA
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11
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Duval KEA, Aulwes E, Zhang R, Rahman M, Ashraf MR, Sloop A, Sunnerberg J, Williams BB, Cao X, Bruza P, Kheirollah A, Tavakkoli A, Jarvis LA, Schaner PE, Swartz HM, Gladstone DJ, Pogue BW, Hoopes PJ. Comparison of Tumor Control and Skin Damage in a Mouse Model after Ultra-High Dose Rate Irradiation and Conventional Irradiation. Radiat Res 2023; 200:223-231. [PMID: 37590482 PMCID: PMC10551764 DOI: 10.1667/rade-23-00057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2023] [Accepted: 07/07/2023] [Indexed: 08/19/2023]
Abstract
Recent studies suggest ultra-high dose rate radiation treatment (UHDR-RT) reduces normal tissue damage compared to conventional radiation treatment (CONV-RT) at the same dose. In this study, we compared first, the kinetics and degree of skin damage in wild-type C57BL/6 mice, and second, tumor treatment efficacy in GL261 and B16F10 dermal tumor models, at the same UHDR-RT and CONV-RT doses. Flank skin of wild-type mice received UHDR-RT or CONV-RT at 25 Gy and 30 Gy. Normal skin damage was tracked by clinical observation to determine the time to moist desquamation, an endpoint which was verified by histopathology. Tumors were inoculated on the right flank of the mice, then received UHDR-RT or CONV-RT at 1 × 11 Gy, 1 × 15, 1 × 25, 3 × 6 and 3 × 8 Gy, and time to tumor tripling volume was determined. Tumors also received 1 × 11, 1 × 15, 3 × 6 and 3 × 8 Gy doses for assessment of CD8+/CD4+ tumor infiltrate and genetic expression 96 h postirradiation. All irradiations of the mouse tumor or flank skin were performed with megavoltage electron beams (10 MeV, 270 Gy/s for UHDR-RT and 9 MeV, 0.12 Gy/s for CONV-RT) delivered via a clinical linear accelerator. Tumor control was statistically equal for similar doses of UHDR-RT and CONV-RT in B16F10 and GL261 murine tumors. There were variable qualitative differences in genetic expression of immune and cell damage-associated pathways between UHDR and CONV irradiated B16F10 tumors. Compared to CONV-RT, UHDR-RT resulted in an increased latent period to skin desquamation after a single 25 Gy dose (7 days longer). Time to moist skin desquamation did not significantly differ between UHDR-RT and CONV-RT after a 30 Gy dose. The histomorphological characteristics of skin damage were similar for UHDR-RT and CONV-RT. These studies demonstrated similar tumor control responses for equivalent single and fractionated radiation doses, with variable difference in expression of tumor progression and immune related gene pathways. There was a modest UHDR-RT skin sparing effect after a 1 × 25 Gy dose but not after a 1 × 30 Gy dose.
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Affiliation(s)
- Kayla E. A. Duval
- Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire
| | - Ethan Aulwes
- Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire
| | - Rongxiao Zhang
- Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire
- Dartmouth Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire
| | - Mahbubur Rahman
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire
| | - M. Ramish Ashraf
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire
| | - Austin Sloop
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire
| | - Jacob Sunnerberg
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire
| | - Benjamin B. Williams
- Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire
- Dartmouth Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire
| | - Xu Cao
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire
| | - Petr Bruza
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire
| | | | - Armin Tavakkoli
- Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire
| | - Lesley A. Jarvis
- Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire
- Dartmouth Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire
| | - Philip E. Schaner
- Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire
- Dartmouth Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire
| | - Harold M. Swartz
- Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire
| | - David J. Gladstone
- Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire
- Dartmouth Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire
| | - Brian W. Pogue
- Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire
- Dartmouth Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire
- Department of Medical Physics, University of Wisconsin, Madison, Wisconsin
| | - P. Jack Hoopes
- Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire
- Dartmouth Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire
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12
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Sunnerberg JP, Zhang R, Gladstone DJ, Swartz HM, Gui J, Pogue BW. Mean dose rate in ultra-high dose rate electron irradiation is a significant predictor for O 2consumption and H 2O 2yield. Phys Med Biol 2023; 68:165014. [PMID: 37463588 PMCID: PMC10405361 DOI: 10.1088/1361-6560/ace877] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2023] [Revised: 06/27/2023] [Accepted: 07/18/2023] [Indexed: 07/20/2023]
Abstract
Objective. The objective of this study was to investigate the impact of mean and instantaneous dose rates on the production of reactive oxygen species (ROS) during ultra-high dose rate (UHDR) radiotherapy. The study aimed to determine whether either dose rate type plays a role in driving the FLASH effect, a phenomenon where UHDR radiotherapy reduces damage to normal tissues while maintaining tumor control.Approach. Assays of hydrogen peroxide (H2O2) production and oxygen consumption (ΔpO2) were conducted using UHDR electron irradiation. Aqueous solutions of 4% albumin were utilized as the experimental medium. The study compared the effects of varying mean dose rates and instantaneous dose rates on ROS yields. Instantaneous dose rate was varied by changing the source-to-surface distance (SSD), resulting in instantaneous dose rates ranging from 102to 106Gy s-1. Mean dose rate was manipulated by altering the pulse frequency of the linear accelerator (linac) and by changing the SSD, ranging from 0.14 to 1500 Gy s-1.Main results. The study found that both ΔH2O2and ΔpO2decreased as the mean dose rate increased. Multivariate analysis indicated that instantaneous dose rates also contributed to this effect. The variation in ΔpO2was dependent on the initial oxygen concentration in the solution. Based on the analysis of dose rate variation, the study estimated that 7.51 moles of H2O2were produced for every mole of O2consumed.Significance. The results highlight the significance of mean dose rate as a predictor of ROS production during UHDR radiotherapy. As the mean dose rate increased, there was a decrease in oxygen consumption and in H2O2production. These findings have implications for understanding the FLASH effect and its potential optimization. The study sheds light on the role of dose rate parameters and their impact on radiochemical outcomes, contributing to the advancement of UHDR radiotherapy techniques.
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Affiliation(s)
- Jacob P Sunnerberg
- Thayer School of Engineering at Dartmouth College, Hanover, NH, United States of America
| | - Rongxiao Zhang
- Thayer School of Engineering at Dartmouth College, Hanover, NH, United States of America
- Dartmouth-Hitchcock Medical Center, Lebanon, NH, United States of America
| | - David J Gladstone
- Thayer School of Engineering at Dartmouth College, Hanover, NH, United States of America
- Dartmouth-Hitchcock Medical Center, Lebanon, NH, United States of America
| | - Harold M Swartz
- Geisel School of Medicine at Dartmouth College, Hanover, NH, United States of America
| | - Jiang Gui
- Geisel School of Medicine at Dartmouth College, Hanover, NH, United States of America
| | - Brian W Pogue
- Thayer School of Engineering at Dartmouth College, Hanover, NH, United States of America
- University of Wisconsin—Madison, Madison, WI, United States of America
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13
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Zou W, Zhang R, Schüler E, Taylor PA, Mascia AE, Diffenderfer ES, Zhao T, Ayan AS, Sharma M, Yu SJ, Lu W, Bosch WR, Tsien C, Surucu M, Pollard-Larkin JM, Schuemann J, Moros EG, Bazalova-Carter M, Gladstone DJ, Li H, Simone CB, Petersson K, Kry SF, Maity A, Loo BW, Dong L, Maxim PG, Xiao Y, Buchsbaum JC. Framework for Quality Assurance of Ultrahigh Dose Rate Clinical Trials Investigating FLASH Effects and Current Technology Gaps. Int J Radiat Oncol Biol Phys 2023; 116:1202-1217. [PMID: 37121362 PMCID: PMC10526970 DOI: 10.1016/j.ijrobp.2023.04.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2023] [Revised: 03/28/2023] [Accepted: 04/17/2023] [Indexed: 05/02/2023]
Abstract
FLASH radiation therapy (FLASH-RT), delivered with ultrahigh dose rate (UHDR), may allow patients to be treated with less normal tissue toxicity for a given tumor dose compared with currently used conventional dose rate. Clinical trials are being carried out and are needed to test whether this improved therapeutic ratio can be achieved clinically. During the clinical trials, quality assurance and credentialing of equipment and participating sites, particularly pertaining to UHDR-specific aspects, will be crucial for the validity of the outcomes of such trials. This report represents an initial framework proposed by the NRG Oncology Center for Innovation in Radiation Oncology FLASH working group on quality assurance of potential UHDR clinical trials and reviews current technology gaps to overcome. An important but separate consideration is the appropriate design of trials to most effectively answer clinical and scientific questions about FLASH. This paper begins with an overview of UHDR RT delivery methods. UHDR beam delivery parameters are then covered, with a focus on electron and proton modalities. The definition and control of safe UHDR beam delivery and current and needed dosimetry technologies are reviewed and discussed. System and site credentialing for large, multi-institution trials are reviewed. Quality assurance is then discussed, and new requirements are presented for treatment system standard analysis, patient positioning, and treatment planning. The tables and figures in this paper are meant to serve as reference points as we move toward FLASH-RT clinical trial performance. Some major questions regarding FLASH-RT are discussed, and next steps in this field are proposed. FLASH-RT has potential but is associated with significant risks and complexities. We need to redefine optimization to focus not only on the dose but also on the dose rate in a manner that is robust and understandable and that can be prescribed, validated, and confirmed in real time. Robust patient safety systems and access to treatment data will be critical as FLASH-RT moves into the clinical trials.
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Affiliation(s)
- Wei Zou
- Department of Radiation Oncology, University of Pennsylvania, Philadelphia, PA, USA.
| | - Rongxiao Zhang
- Department of Radiation Oncology, Geisel School of Medicine, Dartmouth College, Hanover, NH, USA
| | - Emil Schüler
- Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Paige A Taylor
- Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | | | - Eric S Diffenderfer
- Department of Radiation Oncology, University of Pennsylvania, Philadelphia, PA, USA
| | - Tianyu Zhao
- Department of Radiation Oncology, Washington University, St. Louis, MO, USA
| | - Ahmet S Ayan
- Department of Radiation Oncology, Ohio State University, Columbus, OH, USA
| | - Manju Sharma
- Department of Radiation Oncology, University of California San Francisco, San Francisco, CA, USA
| | - Shu-Jung Yu
- Department of Radiation Oncology, Stanford University School of Medicine, Stanford, CA, USA
| | - Weiguo Lu
- Department of Radiation Oncology, University of Texas Southwestern, Dallas, TX, USA
| | - Walter R Bosch
- Department of Radiation Oncology, Washington University, St. Louis, MO, USA
| | - Christina Tsien
- Department of Radiation Oncology, McGill University Health Center, Montreal, QC, Canada
| | - Murat Surucu
- Department of Radiation Oncology, Stanford University School of Medicine, Stanford, CA, USA
| | - Julianne M Pollard-Larkin
- Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Jan Schuemann
- Department of Radiation Oncology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
| | - Eduardo G Moros
- Department of Radiation Oncology, Moffitt Cancer Center, Tampa, FL, USA
| | | | - David J Gladstone
- Department of Radiation Oncology, Geisel School of Medicine, Dartmouth College, Hanover, NH, USA
| | - Heng Li
- Department of Radiation Oncology, Johns Hopkins University, Baltimore, MD, USA
| | - Charles B Simone
- Department of Radiation Oncology, New York Proton Center, New York, NY, USA
| | - Kristoffer Petersson
- Department of Radiation Oncology, MRC Oxford Institute for Radiation Oncology, University of Oxford, Oxford, UK
| | - Stephen F Kry
- Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Amit Maity
- Department of Radiation Oncology, University of Pennsylvania, Philadelphia, PA, USA
| | - Billy W Loo
- Department of Radiation Oncology, Stanford University School of Medicine, Stanford, CA, USA
| | - Lei Dong
- Department of Radiation Oncology, University of Pennsylvania, Philadelphia, PA, USA
| | - Peter G Maxim
- Department of Radiation Oncology, University of California Irvine, Irvine, CA, USA
| | - Ying Xiao
- Department of Radiation Oncology, University of Pennsylvania, Philadelphia, PA, USA
| | - Jeffrey C Buchsbaum
- Radiation Research Program, Division of Cancer Treatment and Diagnosis, National Cancer Institute, National Institute of Health, Bethesda, MD, USA
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Pogue BW, Gladstone DJ, Zhang R. Education case report: CAMPEP Medical Physics PhD education program within Engineering. J Appl Clin Med Phys 2023; 24:e14037. [PMID: 37211701 PMCID: PMC10243322 DOI: 10.1002/acm2.14037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2023] [Revised: 04/24/2023] [Accepted: 05/04/2023] [Indexed: 05/23/2023] Open
Abstract
Medical physics doctoral programs have large variations in organization, administration and financing. Blending a medical physics stream into an engineering graduate program has advantages of pre-existing financial and educational infrastructures. A case study of the accredited program at Dartmouth was carried out, analyzing operational, financial, educational and outcome features. The support structures provided by each institutional partner were outlined, including engineering school, graduate school, and radiation oncology. The initiatives undertaken by founding faculty were reviewed, along with allocated resources, financial model, and peripheral entrepreneurship activities, each with quantitative outcome metrics. Currently 14 PhD students are enrolled, supported by 22 faculty across both engineering and clinical departments. The total peer-reviewed publications are ≈75/year, while the conventional medical physics fraction of this is about 14/year. Following program formation, a significant rise was seen in jointly published papers between engineering and medical physics faculty, up from 5.6 to 13.3 papers/year, with students publishing an average of 11.3/person with 5.7/person as first author. Student support was predominantly via federal grants, with a stable $5.5million/year, using about $610K/year supporting student stipends and tuition. First year funding, recruiting and staff support were via engineering school. Faculty teaching effort was supported by agreement with each home department, and student services were provided by engineering and graduate schools. Student outcomes were exceptional, with high numbers of presentations, awards, and residency placements at research universities. The lack of financial and student support in medical physics can be mitigated by this hybrid design of blending medical physics doctoral students into an engineering graduate program, providing complementary strengths. Future growth in medical physics programs might consider following this pathway, strengthening research collaborations for clinical physics and engineering faculty, as long as there is vested commitment to teach by the faculty and department leadership.
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Affiliation(s)
- Brian W. Pogue
- Thayer School of EngineeringDartmouth CollegeHanoverNew HampshireUSA
- Department of Medical PhysicsUniversity of Wisconsin‐MadisonMadisonWisconsinUSA
| | - David J. Gladstone
- Thayer School of EngineeringDartmouth CollegeHanoverNew HampshireUSA
- Department of MedicineGeisel School of MedicineHanoverNew HampshireUSA
| | - Rongxiao Zhang
- Thayer School of EngineeringDartmouth CollegeHanoverNew HampshireUSA
- Department of MedicineGeisel School of MedicineHanoverNew HampshireUSA
- Radiation MedicineNew York Medical CollegeValhallaNew YorkUSA
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Wilson G, Sharma M, Eagles D, Nemnom MJ, Sivilotti MLA, Émond M, Stiell IG, Stotts G, Lee J, Worster A, Morris J, Cheung KW, Jin AY, Oczkowski WJ, Sahlas DJ, Murray HE, Mackey A, Verreault S, Camden MC, Yip S, Teal P, Gladstone DJ, Boulos MI, Chagnon N, Shouldice E, Atzema C, Slaoui T, Teitlebaum J, Wells GA, Nath A, Perry JJ. Ninety-Day Stroke or Transient Ischemic Attack Recurrence in Patients Prescribed Anticoagulation in the Emergency Department With Atrial Fibrillation and a New Transient Ischemic Attack or Minor Stroke. J Am Heart Assoc 2023; 12:e026681. [PMID: 37026540 DOI: 10.1161/jaha.122.026681] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 04/08/2023]
Abstract
Background For patients with atrial fibrillation seen in the emergency department (ED) following a transient ischemic attack (TIA) or minor stroke, the impact of initiating oral anticoagulation immediately rather than deferring the decision to outpatient follow-up is unknown. Methods and Results We conducted a planned secondary data analysis of a prospective cohort of 11 507 adults in 13 Canadian EDs between 2006 and 2018. Patients were eligible if they were aged 18 years or older, with a final diagnosis of TIA or minor stroke with previously documented or newly diagnosed atrial fibrillation. The primary outcome was subsequent stroke, recurrent TIA, or all-cause mortality within 90 days of the index TIA diagnosis. Secondary outcomes included stroke, recurrent TIA, or death and rates of major bleeding. Of 11 507 subjects with TIA/minor stroke, atrial fibrillation was identified in 11.2% (1286, mean age, 77.3 [SD 11.1] years, 52.4% male). Over half (699; 54.4%) were already taking anticoagulation, 89 (6.9%) were newly prescribed anticoagulation in the ED. By 90 days, 4.0% of the atrial fibrillation cohort had experienced a subsequent stroke, 6.5% subsequent TIA, and 2.6% died. Results of a multivariable logistic regression indicate no association between prescribed anticoagulation in the ED and these 90-day outcomes (composite odds ratio, 1.37 [95% CI, 0.74-2.52]). Major bleeding was found in 5 patients, none of whom were in the ED-initiated anticoagulation group. Conclusions Initiating oral anticoagulation in the ED following new TIA was not associated with lower recurrence rates of neurovascular events or all-cause mortality in patients with atrial fibrillation.
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Affiliation(s)
- Graham Wilson
- Department of Emergency Medicine University of Ottawa Ottawa Ontario Canada
| | - Mukul Sharma
- Division of Neurology McMaster University Hamilton Ontario Canada
| | - Debra Eagles
- Department of Emergency Medicine University of Ottawa Ottawa Ontario Canada
- Ottawa Hospital Research Institute Ottawa Ontario Canada
| | | | | | - Marcel Émond
- CHU de Québec, Hôpital de l'Enfant-Jésus Québec City Québec Canada
- Division of Emergency Medicine Université Laval Québec City Québec Canada
| | - Ian G Stiell
- Department of Emergency Medicine University of Ottawa Ottawa Ontario Canada
- Ottawa Hospital Research Institute Ottawa Ontario Canada
| | - Grant Stotts
- Division of Neurology, Department of Medicine University of Ottawa Ottawa Ontario Canada
| | - Jacques Lee
- Schwartz/Reisman Emergency Medicine Institute, Mount Sinai Hospital Toronto Ontario Canada
- Department of Emergency Medicine, Sunnybrook Health Sciences Centre Toronto Ontario Canada
| | | | - Judy Morris
- Hôpital du Sacré-Cœur de Montréal Université de Montréal Montréal Québec Canada
| | - Ka Wai Cheung
- University of British Columbia Vancouver British Columbia Canada
| | - Albert Y Jin
- Division of Neurology Queen's University Kingston Ontario Canada
| | | | | | - Heather E Murray
- Department of Emergency Medicine Queen's University Kingston Ontario Canada
| | - Ariane Mackey
- CHU de Québec, Hôpital de l'Enfant-Jésus Québec City Québec Canada
- Division of Neurology Laval University Québec City Québec Canada
| | - Steve Verreault
- CHU de Québec, Hôpital de l'Enfant-Jésus Québec City Québec Canada
- Division of Neurology Laval University Québec City Québec Canada
| | - Marie Christine Camden
- CHU de Québec, Hôpital de l'Enfant-Jésus Québec City Québec Canada
- Division of Neurology Laval University Québec City Québec Canada
| | - Samuel Yip
- Division of Neurology University of British Columbia Vancouver British Columbia Canada
| | - Philip Teal
- Division of Neurology University of British Columbia Vancouver British Columbia Canada
| | - David J Gladstone
- Sunnybrook Research Institute and Division of Neurology, Department of Medicine, Sunnybrook Health Sciences Centre and University of Toronto Toronto Ontario Canada
| | - Mark I Boulos
- Sunnybrook Research Institute and Division of Neurology, Department of Medicine, Sunnybrook Health Sciences Centre and University of Toronto Toronto Ontario Canada
| | - Nicolas Chagnon
- Department of Emergency Medicine Montfort Hospital and University of Ottawa Ottawa Ontario Canada
| | | | - Clare Atzema
- Department of Emergency Medicine, Sunnybrook Health Sciences Centre Toronto Ontario Canada
| | - Tarik Slaoui
- Hôpital du Sacré-Cœur de Montréal Université de Montréal Montréal Québec Canada
| | - Jeanne Teitlebaum
- Hôpital du Sacré-Cœur de Montréal Université de Montréal Montréal Québec Canada
| | - George A Wells
- Ottawa Hospital Research Institute Ottawa Ontario Canada
| | - Avik Nath
- Department of Emergency Medicine University of Ottawa Ottawa Ontario Canada
| | - Jeffrey J Perry
- Department of Emergency Medicine University of Ottawa Ottawa Ontario Canada
- Ottawa Hospital Research Institute Ottawa Ontario Canada
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16
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Hunt B, Gill GS, Alexander DA, Streeter SS, Gladstone DJ, Russo GA, Zaki BI, Pogue BW, Zhang R. Fast Deformable Image Registration for Real-Time Target Tracking During Radiation Therapy Using Cine MRI and Deep Learning. Int J Radiat Oncol Biol Phys 2023; 115:983-993. [PMID: 36309075 DOI: 10.1016/j.ijrobp.2022.09.086] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2022] [Revised: 08/10/2022] [Accepted: 09/07/2022] [Indexed: 11/07/2022]
Abstract
PURPOSE We developed a deep learning (DL) model for fast deformable image registration using 2-dimensional sagittal cine magnetic resonance imaging (MRI) acquired during radiation therapy and evaluated its potential for real-time target tracking compared with conventional image registration methods. METHODS AND MATERIALS Our DL model uses a pair of cine MRI images as input and provides a motion vector field (MVF) as output. The MVF is then applied to align the input images. A retrospective study was conducted to train and evaluate our model using cine MRI data from patients undergoing treatment for abdominal and thoracic tumors. For each treatment fraction, MR-linear accelerator delivery log files, tracking videos, and cine image files were analyzed. Individual MRI frames were temporally sampled to construct a large set of image registration pairs used to evaluate multiple methods. The DL model was optimized using 5-fold cross validation, and model outputs (transformed images and MVFs) using test set images were saved for comparison with 3 conventional registration methods (affine, b-spline, and demons). Evaluation metrics were 3-fold: (1) registration error, (2) MVF stability (both spatial and temporal), and (3) average computation time. RESULTS We analyzed >21 hours of cine MRI (>629,000 frames) acquired during 86 treatment fractions from 21 patients. In a test set of 10,320 image registration pairs, DL registration outperformed conventional methods in both registration error (affine, b-spline, demons, DL; root mean square error: 0.067, 0.040, 0.036, 0.032; paired t test demons vs DL: t[20] = 4.2, P < .001) and computation time per frame (51, 1150, 4583, 8 ms). Among deformable methods, spatial stability of resulting MVFs was comparable; however, the DL model had significantly improved temporal consistency. CONCLUSIONS DL-based image registration can leverage large-scale MR cine data sets to outperform conventional registration methods and is a promising solution for real-time deformable motion estimation in radiation therapy.
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Affiliation(s)
- Brady Hunt
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire; Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire; Dartmouth Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire.
| | - Gobind S Gill
- Dartmouth Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire
| | | | - Samuel S Streeter
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire
| | - David J Gladstone
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire; Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire; Dartmouth Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire
| | - Gregory A Russo
- Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire; Dartmouth Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire
| | - Bassem I Zaki
- Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire; Dartmouth Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire
| | - Brian W Pogue
- Department of Medical Physics, University of Wisconsin-Madison, Madison, Wisconsin
| | - Rongxiao Zhang
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire; Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire; Dartmouth Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire
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17
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Rahman M, Zhang R, Gladstone DJ, Williams BB, Chen E, Dexter CA, Thompson L, Bruza P, Pogue BW. Failure Mode and Effects Analysis for Experimental Use of FLASH on a Clinical Accelerator. Pract Radiat Oncol 2023; 13:153-165. [PMID: 36375771 PMCID: PMC10373055 DOI: 10.1016/j.prro.2022.10.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2022] [Revised: 08/21/2022] [Accepted: 10/07/2022] [Indexed: 11/13/2022]
Abstract
PURPOSE The use of a linear accelerator (LINAC) in ultrahigh-dose-rate (UHDR) mode can provide a conduit for wider access to UHDR FLASH effects, sparing normal tissue, but care needs to be taken in the use of such systems to ensure errors are minimized. The failure mode and effects analysis was carried out in a team that has been involved in converting a LINAC between clinical use and UHDR experimental mode for more than 1 year after the proposed methods of TG100. METHODS AND MATERIALS A team of 9 professionals with extensive experience were polled to outline the process map and workflow for analysis, and developed fault trees for potential errors, as well as failure modes that would result. The team scored the categories of severity magnitude, occurrence likelihood, and detectability potential in a scale of 1 to 10, so that a risk priority number (RPN = severity×occurrence×detectability) could be assessed for each. RESULTS A total of 46 potential failure modes were identified, including 5 with an RPN >100. These failure modes involved (1) patient set up, (2) gating mechanisms in delivery, and (3) detector in the beam stop mechanism. The identified methods to mitigate errors included the (1) use of a checklist post conversion, (2) use of robust radiation detectors, (3) automation of quality assurance and beam consistency checks, and (4) implementation of surface guidance during beam delivery. CONCLUSIONS The failure mode and effects analysis process was considered critically important in this setting of a new use of a LINAC, and the expert team developed a higher level of confidence in the ability to safely move UHDR LINAC use toward expanded research access.
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Affiliation(s)
- Mahbubur Rahman
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire; University of Texas Southwestern Medical Center, Dallas, Texas.
| | - Rongxiao Zhang
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire; Department of Medicine, Radiation Oncology, Geisel School of Medicine, Dartmouth College Hanover, New Hampshire; Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire
| | - David J Gladstone
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire; Department of Medicine, Radiation Oncology, Geisel School of Medicine, Dartmouth College Hanover, New Hampshire; Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire
| | - Benjamin B Williams
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire; Department of Medicine, Radiation Oncology, Geisel School of Medicine, Dartmouth College Hanover, New Hampshire; Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire
| | - Erli Chen
- Cheshire Medical Center, Keene, New Hampshire
| | - Chad A Dexter
- Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire
| | - Lawrence Thompson
- Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire
| | - Petr Bruza
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire
| | - Brian W Pogue
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire; Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire; Department of Surgery, Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire; Department of Medical Physics, Wisconsin Institutes for Medical Research, University of Wisconsin, Madison, Wisconsin
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18
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Wickramasinghe VA, Decker SM, Streeter SS, Sloop AM, Petusseau AF, Alexander DA, Bruza P, Gladstone DJ, Zhang R, Pogue BW. Color-resolved Cherenkov imaging allows for differential signal detection in blood and melanin content. J Biomed Opt 2023; 28:036005. [PMID: 36923987 PMCID: PMC10008915 DOI: 10.1117/1.jbo.28.3.036005] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/13/2022] [Accepted: 02/15/2023] [Indexed: 06/18/2023]
Abstract
Significance High-energy x-ray delivery from a linear accelerator results in the production of spectrally continuous broadband Cherenkov light inside tissue. In the absence of attenuation, there is a linear relationship between Cherenkov emission and deposited dose; however, scattering and absorption result in the distortion of this linear relationship. As Cherenkov emission exits the absorption by tissue dominates the observed Cherenkov emission spectrum. Spectroscopic interpretation of this effects may help to better relate Cherenkov emission to ionizing radiation dose delivered during radiotherapy. Aim In this study, we examined how color Cherenkov imaging intensity variations are caused by absorption from both melanin and hemoglobin level variations, so that future Cherenkov emission imaging might be corrected for linearity to delivered dose. Approach A custom, time-gated, three-channel intensified camera was used to image the red, green, and blue wavelengths of Cherenkov emission from tissue phantoms with synthetic melanin layers and varying blood concentrations. Our hypothesis was that spectroscopic separation of Cherenkov emission would allow for the identification of attenuated signals that varied in response to changes in blood content versus melanin content, because of their different characteristic absorption spectra. Results Cherenkov emission scaled with dose linearly in all channels. Absorption in the blue and green channels increased with increasing oxy-hemoglobin in the blood to a greater extent than in the red channel. Melanin was found to absorb with only slight differences between all channels. These spectral differences can be used to derive dose from measured Cherenkov emission. Conclusions Color Cherenkov emission imaging may be used to improve the optical measurement and determination of dose delivered in tissues. Calibration for these factors to minimize the influence of the tissue types and skin tones may be possible using color camera system information based upon the linearity of the observed signals.
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Affiliation(s)
| | - Savannah M. Decker
- Dartmouth College, Thayer School of Engineering, Hanover, New Hampshire, United States
| | - Samuel S. Streeter
- Dartmouth College, Thayer School of Engineering, Hanover, New Hampshire, United States
| | - Austin M. Sloop
- Dartmouth College, Thayer School of Engineering, Hanover, New Hampshire, United States
| | - Arthur F. Petusseau
- Dartmouth College, Thayer School of Engineering, Hanover, New Hampshire, United States
| | - Daniel A. Alexander
- Dartmouth College, Thayer School of Engineering, Hanover, New Hampshire, United States
| | - Petr Bruza
- Dartmouth College, Thayer School of Engineering, Hanover, New Hampshire, United States
| | - David J. Gladstone
- Dartmouth College, Thayer School of Engineering, Hanover, New Hampshire, United States
- Dartmouth College, Geisel School of Medicine, Department of Medicine, Hanover, New Hampshire, United States
| | - Rongxiao Zhang
- Dartmouth College, Thayer School of Engineering, Hanover, New Hampshire, United States
- Dartmouth College, Geisel School of Medicine, Department of Medicine, Hanover, New Hampshire, United States
| | - Brian W. Pogue
- Dartmouth College, Thayer School of Engineering, Hanover, New Hampshire, United States
- University of Wisconsin–Madison, Department of Medical Physics, Madison, Wisconsin, United States
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19
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Al-Ajlan FS, Gladstone DJ, Song D, Thorpe KE, Swartz RH, Butcher KS, Del Campo M, Dowlatshahi D, Gensicke H, Lee GJ, Flaherty ML, Hill MD, Aviv RI, Demchuk AM. Time Course of Early Hematoma Expansion in Acute Spot-Sign Positive Intracerebral Hemorrhage: Prespecified Analysis of the SPOTLIGHT Randomized Clinical Trial. Stroke 2023; 54:715-721. [PMID: 36756899 DOI: 10.1161/strokeaha.121.038475] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
Abstract
BACKGROUND In the SPOTLIGHT trial (Spot Sign Selection of Intracerebral Hemorrhage to Guide Hemostatic Therapy), patients with a computed tomography (CT) angiography spot-sign positive acute intracerebral hemorrhage were randomized to rFVIIa (recombinant activated factor VIIa; 80 μg/kg) or placebo within 6 hours of onset, aiming to limit hematoma expansion. Administration of rFVIIa did not significantly reduce hematoma expansion. In this prespecified analysis, we aimed to investigate the impact of delays from baseline imaging to study drug administration on hematoma expansion. METHODS Hematoma volumes were measured on the baseline CT, early post-dose CT, and 24 hours CT scans. Total hematoma volume (intracerebral hemorrhage+intraventricular hemorrhage) change between the 3 scans was calculated as an estimate of how much hematoma expansion occurred before and after studying drug administration. RESULTS Of the 50 patients included in the trial, 44 had an early post-dose CT scan. Median time (interquartile range) from onset to baseline CT was 1.4 hours (1.2-2.6). Median time from baseline CT to study drug was 62.5 (55-80) minutes, and from study drug to early post-dose CT was 19 (14.5-30) minutes. Median (interquartile range) total hematoma volume increased from baseline CT to early post-dose CT by 10.0 mL (-0.7 to 18.5) in the rFVIIa arm and 5.4 mL (1.8-8.3) in the placebo arm (P=0.96). Median volume change between the early post-dose CT and follow-up scan was 0.6 mL (-2.6 to 8.3) in the rFVIIa arm and 0.7 mL (-1.6 to 2.1) in the placebo arm (P=0.98). Total hematoma volume decreased between the early post-dose CT and 24-hour scan in 44.2% of cases (rFVIIa 38.9% and placebo 48%). The adjusted hematoma growth in volume immediately post dose for FVIIa was 0.998 times that of placebo ([95% CI, 0.71-1.43]; P=0.99). The hourly growth in FFVIIa was 0.998 times that for placebo ([95% CI, 0.994-1.003]; P=0.50; Table 3). CONCLUSIONS In the SPOTLIGHT trial, the adjusted hematoma volume growth was not associated with Factor VIIa treatment. Most hematoma expansion occurred between the baseline CT and the early post-dose CT, limiting any potential treatment effect of hemostatic therapy. Future hemostatic trials must treat intracerebral hemorrhage patients earlier from onset, with minimal delay between baseline CT and drug administration. REGISTRATION URL: https://www. CLINICALTRIALS gov; Unique identifier: NCT01359202.
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Affiliation(s)
- Fahad S Al-Ajlan
- Department of Neurosciences (Neurology), King Faisal Specialist Hospital and Research Center, Alfaisal University, Riyadh, Saudi Arabia (F.S.A.-A.)
| | - David J Gladstone
- Sunnybrook Research Institute, Hurvitz Brain Sciences Program and Department of Medicine, Sunnybrook Health Sciences Centre (D.J.G., R.H.S.).,Department of Medicine (Neurology), University of Toronto, Canada (D.J.G., R.H.S., M.D.C.)
| | - Dongbeom Song
- Calgary Stroke Program, Department of Clinical Neurosciences, Department of Radiology, Hotchkiss Brain Institute, Cumming School of Medicine, University of Calgary, Canada (D.S., G.J.L., M.D.H., A.M.D.)
| | - Kevin E Thorpe
- Applied Health Research Centre, Li Ka Shing Knowledge Institute, St. Michael's Hospital, Dalla Lana School of Public Health, University of Toronto, Canada (K.E.T.)
| | - Rick H Swartz
- Sunnybrook Research Institute, Hurvitz Brain Sciences Program and Department of Medicine, Sunnybrook Health Sciences Centre (D.J.G., R.H.S.).,Department of Medicine (Neurology), University of Toronto, Canada (D.J.G., R.H.S., M.D.C.)
| | - Kenneth S Butcher
- Prince of Wales Clinical School, University of New South Wales, Sydney, AustraliaDepartment of Medicine (Neurology), University of Alberta, Edmonton, Canada (K.S.B.)
| | - Martin Del Campo
- Department of Medicine (Neurology), University of Toronto, Canada (D.J.G., R.H.S., M.D.C.)
| | - Dar Dowlatshahi
- Department of Medicine (Neurology), University of Ottawa and Ottawa Hospital Research Institute, Canada (D.D.)
| | - Henrik Gensicke
- Stroke Center and Neurology, University Hospital Basel, Switzerland (H.G.)
| | - Gloria Jooyoung Lee
- Calgary Stroke Program, Department of Clinical Neurosciences, Department of Radiology, Hotchkiss Brain Institute, Cumming School of Medicine, University of Calgary, Canada (D.S., G.J.L., M.D.H., A.M.D.)
| | - Matthew L Flaherty
- Department of Neurology, University of Cincinnati, OH (M.L.F., R.I.A.). Division of Neuroradiology and Department of Medical Imaging, Sunnybrook Health Sciences Centre, University of Toronto, Canada
| | - Michael D Hill
- Calgary Stroke Program, Department of Clinical Neurosciences, Department of Radiology, Hotchkiss Brain Institute, Cumming School of Medicine, University of Calgary, Canada (D.S., G.J.L., M.D.H., A.M.D.)
| | - Richard I Aviv
- Department of Neurology, University of Cincinnati, OH (M.L.F., R.I.A.). Division of Neuroradiology and Department of Medical Imaging, Sunnybrook Health Sciences Centre, University of Toronto, Canada
| | - Andrew M Demchuk
- Calgary Stroke Program, Department of Clinical Neurosciences, Department of Radiology, Hotchkiss Brain Institute, Cumming School of Medicine, University of Calgary, Canada (D.S., G.J.L., M.D.H., A.M.D.)
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20
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Ferguson E, Yadav K, Sharma M, Sivilotti MLA, Émond M, Stiell IG, Stotts G, Lee JS, Worster A, Morris J, Cheung KW, Jin AY, Oczkowski WJ, Sahlas DJ, Murray HE, Mackey A, Verreault S, Camden MC, Yip S, Teal P, Gladstone DJ, Boulos MI, Chagnon N, Shouldice E, Atzema C, Slaoui T, Teitelbaum J, Nemnom MJ, Wells GA, Nath A, Perry JJ. Prospective Validation of Computed Tomography to Identify Patients at High Risk for Stroke After Transient Ischemic Attack or Minor Stroke. Stroke 2023; 54:1030-1036. [PMID: 36779338 DOI: 10.1161/strokeaha.121.038000] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/14/2023]
Abstract
BACKGROUND Computed tomography (CT) findings of acute and chronic ischemia are associated with subsequent stroke risk in patients with transient ischemic attack. We sought to validate these associations in a large prospective cohort of patients with transient ischemic attack or minor stroke. METHODS This prospective cohort study enrolled emergency department patients from 13 hospitals with transient ischemic attack who had CT imaging. Primary outcome was stroke within 90 days. Secondary outcomes were stroke within 2 or 7 days. CT findings were abstracted from radiology reports and classified for the presence of acute ischemia, chronic ischemia, or microangiopathy. Multivariable logistic regression was used to test associations with primary and secondary end points. RESULTS From 8670 prospectively enrolled patients between May 2010 and May 2017, 8382 had a CT within 24 hours. From this total population, 4547 (54%) patients had evidence of acute ischemia, chronic ischemia, or microangiopathy on CT, of whom 175 had a subsequent stroke within 90 days (3.8% subsequent stroke rate; adjusted odds ratio [aOR], 2.33 [95% CI, 1.62-3.36]). This was in comparison to those with CT imaging without ischemia. Findings associated with an increased risk of stroke at 90 days were isolated acute ischemia (6.0%; aOR, 2.42 [95% CI, 1.03-5.66]), acute ischemia with microangiopathy (10.7%; aOR, 3.34 [95% CI, 1.57-7.14]), chronic ischemia with microangiopathy (5.2%; aOR, 1.83 [95% CI, 1.34-2.50]), and acute ischemia with chronic ischemia and microangiopathy (10.9%; aOR, 3.49 [95% CI, 1.54-7.91]). Acute ischemia with chronic ischemia and microangiopathy were most strongly associated with subsequent stroke within 2 days (aOR, 4.36 [95% CI, 1.31-14.54]) and 7 days (aOR, 4.50 [95% CI, 1.73-11.69]). CONCLUSIONS In patients with transient ischemic attack or minor stroke, CT evidence of acute ischemia with chronic ischemia or microangiopathy significantly increases the risk of subsequent stroke within 90 days of index visit. The combination of all 3 findings results in the greatest early risk.
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Affiliation(s)
- Emma Ferguson
- Department of Emergency Medicine, University of Ottawa, Ontario, Canada. (E.F., K.Y., I.G.S., A.N., J.J.P.)
| | - Krishan Yadav
- Department of Emergency Medicine, University of Ottawa, Ontario, Canada. (E.F., K.Y., I.G.S., A.N., J.J.P.).,Ottawa Hospital Research Institute, Ontario, Canada (K.Y., I.G.S., M.-J.N., J.J.P.)
| | - Mukul Sharma
- Division of Neurology, McMaster University, Hamilton, Ontario, Canada (M.S., W.J.O., D.J.S.)
| | - Marco L A Sivilotti
- Department of Emergency Medicine, Queen's University, Kingston, Ontario, Canada. (M.L.A.S., H.E.M.)
| | - Marcel Émond
- CHU de Québec, Hôpital de l'Enfant-Jésus, Canada (M.É., A.M., S.V., M.-C.C.).,Division of Emergency Medicine, Laval University, Quebec City, Quebec, Canada. (M.É.)
| | - Ian G Stiell
- Department of Emergency Medicine, University of Ottawa, Ontario, Canada. (E.F., K.Y., I.G.S., A.N., J.J.P.).,Ottawa Hospital Research Institute, Ontario, Canada (K.Y., I.G.S., M.-J.N., J.J.P.)
| | - Grant Stotts
- Division of Neurology, Department of Medicine, University of Ottawa, Ontario, Canada. (G.S.)
| | - Jacques S Lee
- Schwartz\Reisman Emergency Medicine Institute, Mount Sinai Hospital, Toronto, Ontario, Canada (J.S.L.)
| | - Andrew Worster
- Department of Medicine, Division of Emergency Medicine, McMaster University, Hamilton, Ontario, Canada (A.W.)
| | - Judy Morris
- Hôpital du Sacré-Cœur de Montréal, Université de Montréal, Quebec, Canada (J.M., T.S., J.T.)
| | - Ka Wai Cheung
- Department of Emergency Medicine, University of British Columbia, Vancouver, Canada. (K.W.C.)
| | - Albert Y Jin
- Division of Neurology, Queen's University, Kingston, Ontario, Canada. (A.Y.J.)
| | - Wieslaw J Oczkowski
- Division of Neurology, McMaster University, Hamilton, Ontario, Canada (M.S., W.J.O., D.J.S.)
| | - Demetrios J Sahlas
- Division of Neurology, McMaster University, Hamilton, Ontario, Canada (M.S., W.J.O., D.J.S.)
| | - Heather E Murray
- Department of Emergency Medicine, Queen's University, Kingston, Ontario, Canada. (M.L.A.S., H.E.M.)
| | - Ariane Mackey
- CHU de Québec, Hôpital de l'Enfant-Jésus, Canada (M.É., A.M., S.V., M.-C.C.).,Division of Neurology, Laval University, Quebec City, Quebec, Canada. (A.M., S.V., M.-C.C.)
| | - Steve Verreault
- CHU de Québec, Hôpital de l'Enfant-Jésus, Canada (M.É., A.M., S.V., M.-C.C.).,Division of Neurology, Laval University, Quebec City, Quebec, Canada. (A.M., S.V., M.-C.C.)
| | - Marie-Christine Camden
- CHU de Québec, Hôpital de l'Enfant-Jésus, Canada (M.É., A.M., S.V., M.-C.C.).,Division of Neurology, Laval University, Quebec City, Quebec, Canada. (A.M., S.V., M.-C.C.)
| | - Samuel Yip
- Division of Neurology, University of British Columbia, Vancouver, Canada. (S.Y., P.T.)
| | - Philip Teal
- Division of Neurology, University of British Columbia, Vancouver, Canada. (S.Y., P.T.)
| | - David J Gladstone
- Sunnybrook Research Institute and Division of Neurology, Department of Medicine, Sunnybrook Health Sciences Centre and University of Toronto, Ontario, Canada. (D.J.G., M.I.B.)
| | - Mark I Boulos
- Sunnybrook Research Institute and Division of Neurology, Department of Medicine, Sunnybrook Health Sciences Centre and University of Toronto, Ontario, Canada. (D.J.G., M.I.B.)
| | - Nicolas Chagnon
- Department of Emergency Medicine, Montfort Hospital, University of Ottawa, Ontario, Canada. (N.C.)
| | | | - Clare Atzema
- Sunnybrook Research Institute, ICES, Toronto Canada (C.A.).,Division of Emergency Medicine, Department of Medicine, Sunnybrook Health Sciences Centre and University of Toronto, Ontario, Canada. (C.A.)
| | - Tarik Slaoui
- Hôpital du Sacré-Cœur de Montréal, Université de Montréal, Quebec, Canada (J.M., T.S., J.T.)
| | - Jeanne Teitelbaum
- Hôpital du Sacré-Cœur de Montréal, Université de Montréal, Quebec, Canada (J.M., T.S., J.T.)
| | - Marie-Joe Nemnom
- Ottawa Hospital Research Institute, Ontario, Canada (K.Y., I.G.S., M.-J.N., J.J.P.)
| | - George A Wells
- University of Ottawa Heart Institute, Ottawa, Ontario, Canada (G.A.W.)
| | - Avik Nath
- Department of Emergency Medicine, University of Ottawa, Ontario, Canada. (E.F., K.Y., I.G.S., A.N., J.J.P.)
| | - Jeffrey J Perry
- Department of Emergency Medicine, University of Ottawa, Ontario, Canada. (E.F., K.Y., I.G.S., A.N., J.J.P.).,Ottawa Hospital Research Institute, Ontario, Canada (K.Y., I.G.S., M.-J.N., J.J.P.)
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21
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Alexander DA, Decker SM, Jermyn M, Bruza P, Zhang R, Chen E, McGlynn TL, Rosselot RA, Lee J, Rose ML, Williams BB, Pogue BW, Gladstone DJ, Jarvis LA. One Year of Clinic-Wide Cherenkov Imaging for Discovery of Quality Improvement Opportunities in Radiation Therapy. Pract Radiat Oncol 2023; 13:71-81. [PMID: 35777728 PMCID: PMC10984217 DOI: 10.1016/j.prro.2022.06.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2022] [Revised: 05/20/2022] [Accepted: 06/07/2022] [Indexed: 01/10/2023]
Abstract
PURPOSE Cherenkov imaging is clinically available as a radiation therapy treatment verification tool. The aim of this work was to discover the benefits of always-on Cherenkov imaging as a novel incident detection and quality improvement system through review of all imaging at our center. METHODS AND MATERIALS Multicamera Cherenkov imaging systems were permanently installed in 3 treatment bunkers, imaging continuously over a year. Images were acquired as part of normal treatment procedures and reviewed for potential treatment delivery anomalies. RESULTS In total, 622 unique patients were evaluated for this study. We identified 9 patients with treatment anomalies occurring over their course of treatment, which were only detected with Cherenkov imaging. Categorizing each event indicated issues arising in simulation, planning, pretreatment review, and treatment delivery, and none of the incidents were detected before this review by conventional measures. The incidents identified in this study included dose to unintended areas in planning, dose to unintended areas due to positioning at treatment, and nonideal bolus placement during setup. CONCLUSIONS Cherenkov imaging was shown to provide a unique method of detecting radiation therapy incidents that would have otherwise gone undetected. Although none of the events detected in this study reached the threshold of reporting, they identified opportunities for practice improvement and demonstrated added value of Cherenkov imaging in quality assurance programs.
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Affiliation(s)
- Daniel A Alexander
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire.
| | - Savannah M Decker
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire; Dose Optics LLC, Lebanon, New Hampshire
| | - Michael Jermyn
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire; Dose Optics LLC, Lebanon, New Hampshire
| | - Petr Bruza
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire; Dose Optics LLC, Lebanon, New Hampshire
| | - Rongxiao Zhang
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire; Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire; Dartmouth Cancer Center, Lebanon, New Hampshire
| | - Erli Chen
- Cheshire Medical Center, Keene, New Hampshire
| | | | | | - Jae Lee
- Dartmouth Cancer Center, Lebanon, New Hampshire
| | | | - Benjamin B Williams
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire; Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire; Dartmouth Cancer Center, Lebanon, New Hampshire
| | - Brian W Pogue
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire; Dose Optics LLC, Lebanon, New Hampshire; Department of Medical Physics, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin
| | - David J Gladstone
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire; Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire
| | - Lesley A Jarvis
- Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire; Dartmouth Cancer Center, Lebanon, New Hampshire
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22
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Miao T, Zhang R, Jermyn M, Bruza P, Zhu T, Pogue BW, Gladstone DJ, Williams BB. Computational dose visualization & comparison in total skin electron treatment suggests superior coverage by the rotational versus the Stanford technique. J Med Imaging Radiat Sci 2022; 53:612-622. [PMID: 36045017 PMCID: PMC10152509 DOI: 10.1016/j.jmir.2022.08.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2022] [Revised: 07/16/2022] [Accepted: 08/11/2022] [Indexed: 12/24/2022]
Abstract
INTRODUCTION/BACKGROUND The goal of Total Skin Electron Therapy (TSET) is to achieve a uniform surface dose, although assessment of this is never really done and typically limited points are sampled. A computational treatment simulation approach was developed to estimate dose distributions over the body surface, to compare uniformity of (i) the 6 pose Stanford technique and (ii) the rotational technique. METHODS The relative angular dose distributions from electron beam irradiation was calculated by Monte Carlo simulation for cylinders with a range of diameters, approximating body part curvatures. These were used to project dose onto a 3D body model of the TSET patient's skin surfaces. Computer animation methods were used to accumulate the dose values, for display and analysis of the homogeneity of coverage. RESULTS The rotational technique provided more uniform coverage than the Stanford technique. Anomalies of under dose were observed in lateral abdominal regions, above the shoulders and in the perineum. The Stanford technique had larger areas of low dose laterally. In the rotational technique, 90% of the patient's skin was within ±10% of the prescribed dose, while this percentage decreased to 60% or 85% for the Stanford technique, varying with patient body mass. Interestingly, the highest discrepancy was most apparent in high body mass patients, which can be attributed to the loss of tangent dose at low angles of curvature. DISCUSSION/CONCLUSION This simulation and visualization approach is a practical means to analyze TSET dose, requiring only optical surface body topography scans. Under- and over-exposed body regions can be found, and irradiation could be customized to each patient. Dose Area Histogram (DAH) distribution analysis showed the rotational technique to have better uniformity, with most areas within 10% of the umbilicus value. Future use of this approach to analyze dose coverage is possible as a routine planning tool.
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Affiliation(s)
- Tianshun Miao
- Thayer School of Engineering, Dartmouth College, Hanover NH, 03755, USA
| | - Rongxiao Zhang
- Thayer School of Engineering, Dartmouth College, Hanover NH, 03755, USA; Department of Medicine, Radiation Oncology, Norris Cotton Cancer Center, Dartmouth Hitchcock Medical Center, Lebanon, NH 03766, USA
| | - Michael Jermyn
- Thayer School of Engineering, Dartmouth College, Hanover NH, 03755, USA; DoseOptics, LLC, Lebanon NH 03755 USA
| | - Petr Bruza
- Thayer School of Engineering, Dartmouth College, Hanover NH, 03755, USA; DoseOptics, LLC, Lebanon NH 03755 USA
| | - Timothy Zhu
- Department of Radiation Oncology, Perelman School of Medicine, University of Pennsylvania, Philadelphia PA, 19104 USA
| | - Brian W Pogue
- Thayer School of Engineering, Dartmouth College, Hanover NH, 03755, USA; DoseOptics, LLC, Lebanon NH 03755 USA; Department of Medical Physics, University of Wisconsin-Madison, Wisconsin WI 53705 USA.
| | - David J Gladstone
- Thayer School of Engineering, Dartmouth College, Hanover NH, 03755, USA; Department of Medicine, Radiation Oncology, Norris Cotton Cancer Center, Dartmouth Hitchcock Medical Center, Lebanon, NH 03766, USA
| | - Benjamin B Williams
- Thayer School of Engineering, Dartmouth College, Hanover NH, 03755, USA; Department of Medicine, Radiation Oncology, Norris Cotton Cancer Center, Dartmouth Hitchcock Medical Center, Lebanon, NH 03766, USA
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23
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Li Z, Marion D, Blair J, Soliman EZ, Gladstone DJ, Kamel H, Manuel D, Edwards JD. Association between markers of left atrial cardiopathy and cognitive decline in the absence of atrial fibrillation. Alzheimers Dement 2022. [DOI: 10.1002/alz.062384] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Zhe Li
- University of Ottawa Heart Institute Ottawa ON Canada
| | | | - Jessica Blair
- The University of Alabama at Birmingham Birmingham AL USA
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24
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Hartford AC, Gill GS, Ravi D, Tosteson TD, Li Z, Russo G, Eskey CJ, Jarvis LA, Simmons NE, Evans LT, Williams BB, Gladstone DJ, Roberts DW, Buckey JC. Sensitizing brain metastases to stereotactic radiosurgery using hyperbaric oxygen: A proof-of-principle study. Radiother Oncol 2022; 177:179-184. [PMID: 36404528 PMCID: PMC10827304 DOI: 10.1016/j.radonc.2022.10.024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2021] [Revised: 09/30/2022] [Accepted: 10/21/2022] [Indexed: 11/07/2022]
Abstract
PURPOSE Increased oxygen levels may enhance the radiosensitivity of brain metastases treated with stereotactic radiosurgery (SRS). This project administered hyperbaric oxygen (HBO) prior to SRS to assess feasibility, safety, and response. METHODS 38 patients were studied, 19 with 25 brain metastases treated with HBO prior to SRS, and 19 historical controls with 27 metastases, matched for histology, GPA, resection status, and lesion size. Outcomes included time from HBO to SRS, quality-of-life (QOL) measures, local control, distant (brain) metastases, radionecrosis, and overall survival. RESULTS The average time from HBO chamber to SRS beam-on was 8.3 ± 1.7 minutes. Solicited adverse events (AEs) were comparable between HBO and control patients; no grade III or IV serious AEs were observed. Radionecrosis-free survival (RNFS), radionecrosis-free survival before whole-brain radiation therapy (WBRT) (RNBWFS), local recurrence-free survival before WBRT (LRBWFS), distant recurrence-free survival before WBRT (DRBWFS), and overall survival (OS) were not significantly different for HBO patients and controls on Kaplan-Meier analysis, though at 1-year estimated survival rates trended in favor of SRS + HBO: RNFS - 83% vs 60%; RNBWFS - 78% vs 60%; LRBWFS - 95% vs 78%; DRBWFS - 61% vs 57%; and OS - 73% vs 56%. Multivariate Cox models indicated no significant association between HBO treatment and hazards of RN, local or distant recurrence, or mortality; however, these did show statistically significant associations (p < 0.05) for: local recurrence with higher volume, radionecrosis with tumor resection, overall survival with resection, and overall survival with higher GPA. CONCLUSION Addition of HBO to SRS for brain metastases is feasible without evident decrement in radiation necrosis and other clinical outcomes.
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Affiliation(s)
- Alan C Hartford
- Dartmouth-Hitchcock Medical Center, One Medical Center Drive, Lebanon, NH 03756, USA.
| | - Gobind S Gill
- Dartmouth-Hitchcock Medical Center, One Medical Center Drive, Lebanon, NH 03756, USA
| | - Divya Ravi
- Dartmouth Cancer Center, One Medical Center Drive, Lebanon, NH 03756, USA
| | - Tor D Tosteson
- Dartmouth Cancer Center, One Medical Center Drive, Lebanon, NH 03756, USA.
| | - Zhongze Li
- Dartmouth Cancer Center, One Medical Center Drive, Lebanon, NH 03756, USA
| | - Gregory Russo
- Dartmouth-Hitchcock Medical Center, One Medical Center Drive, Lebanon, NH 03756, USA
| | - Clifford J Eskey
- Dartmouth-Hitchcock Medical Center, One Medical Center Drive, Lebanon, NH 03756, USA
| | - Lesley A Jarvis
- Dartmouth-Hitchcock Medical Center, One Medical Center Drive, Lebanon, NH 03756, USA
| | - Nathan E Simmons
- Dartmouth-Hitchcock Medical Center, One Medical Center Drive, Lebanon, NH 03756, USA
| | - Linton T Evans
- Dartmouth-Hitchcock Medical Center, One Medical Center Drive, Lebanon, NH 03756, USA
| | - Benjamin B Williams
- Dartmouth-Hitchcock Medical Center, One Medical Center Drive, Lebanon, NH 03756, USA
| | - David J Gladstone
- Dartmouth Cancer Center, One Medical Center Drive, Lebanon, NH 03756, USA
| | - David W Roberts
- Dartmouth Cancer Center, One Medical Center Drive, Lebanon, NH 03756, USA
| | - Jay C Buckey
- Dartmouth-Hitchcock Medical Center, One Medical Center Drive, Lebanon, NH 03756, USA
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25
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Tsivgoulis G, Palaiodimou L, Triantafyllou S, Köhrmann M, Dilaveris P, Tsioufis K, Magiorkinis G, Krogias C, Schellinger PD, Caso V, Paciaroni M, Sharma M, Lemmens R, Gladstone DJ, Sanna T, Wachter R, Filippatos G, Katsanos AH. Prolonged cardiac monitoring for stroke prevention: A systematic review and meta-analysis of randomized-controlled clinical trials. Eur Stroke J 2022; 8:106-116. [PMID: 37021198 PMCID: PMC10069201 DOI: 10.1177/23969873221139410] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2022] [Accepted: 10/27/2022] [Indexed: 11/22/2022] Open
Abstract
Introduction: Prolonged cardiac monitoring (PCM) substantially improves the detection of subclinical atrial fibrillation (AF) among patients with history of ischemic stroke (IS), leading to prompt initiation of anticoagulants. However, whether PCM may lead to IS prevention remains equivocal. Patients and methods: In this systematic review and meta-analysis, randomized-controlled clinical trials (RCTs) reporting IS rates among patients with known cardiovascular risk factors, including but not limited to history of IS, who received PCM for more than 7 days versus more conservative cardiac rhythm monitoring methods were pooled. Results: Seven RCTs were included comprising a total of 9048 patients with at least one known cardiovascular risk factor that underwent cardiac rhythm monitoring. PCM was associated with reduction of IS occurrence compared to conventional monitoring (Risk Ratio: 0.76; 95% CI: 0.59–0.96; I2 = 0%). This association was also significant in the subgroup of RCTs investigating implantable cardiac monitoring (Risk Ratio: 0.75; 95% CI: 0.58–0.97; I2 = 0%). However, when RCTs assessing PCM in both primary and secondary prevention settings were excluded or when RCTs investigating PCM with a duration of 7 days or less were included, the association between PCM and reduction of IS did not retain its statistical significance. Regarding the secondary outcomes, PCM was related to higher likelihood for AF detection and anticoagulant initiation. No association was documented between PCM and IS/transient ischemic attack occurrence, all-cause mortality, intracranial hemorrhage, or major bleeding. Conclusion: PCM may represent an effective stroke prevention strategy in selected patients. Additional RCTs are warranted to validate the robustness of the reported associations.
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Affiliation(s)
- Georgios Tsivgoulis
- Second Department of Neurology, “Attikon” University Hospital, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece
- Department of Neurology, University of Tennessee Health Science Center, Memphis, TN, USA
| | - Lina Palaiodimou
- Second Department of Neurology, “Attikon” University Hospital, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece
| | - Sokratis Triantafyllou
- Second Department of Neurology, “Attikon” University Hospital, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece
| | - Martin Köhrmann
- Department of Neurology, Universitätsklinikum Essen, Essen, Germany
| | - Polychronis Dilaveris
- First Department of Cardiology, National and Kapodistrian University of Athens, School of Medicine, Hippokration Hospital, Athens, Greece
| | - Konstantinos Tsioufis
- First Department of Cardiology, National and Kapodistrian University of Athens, School of Medicine, Hippokration Hospital, Athens, Greece
| | - Gkikas Magiorkinis
- Department of Hygiene, Epidemiology and Medical Statistics, Medical School, National and Kapodistrian University of Athens, Athens, Greece
| | - Christos Krogias
- Department of Neurology, St. Josef-Hospital, Ruhr University, Bochum, Germany
| | - Peter D Schellinger
- Department of Neurology and Neurogeriatry, Johannes Wesling Medical Center, Ruhr University Bochum, Minden, Germany
| | - Valeria Caso
- Stroke Unit, Santa Maria Della Misericordia Hospital, University of Perugia, Perugia, Italy
| | - Maurizio Paciaroni
- Stroke Unit, Santa Maria Della Misericordia Hospital, University of Perugia, Perugia, Italy
| | - Mukul Sharma
- Division of Neurology, McMaster University and Population Health Research Institute, Hamilton, ON, Canada
| | - Robin Lemmens
- Department of Neurosciences, Experimental Neurology and Leuven Research Institute for Neuroscience and Disease (LIND), KU Leuven - University of Leuven, Leuven, Belgium
- Center for Brain & Disease Research, Laboratory of Neurobiology, Leuven, Belgium
- Department of Neurology, University Hospitals Leuven, Leuven, Belgium
| | - David J Gladstone
- Sunnybrook Research Institute and Hurvitz Brain Sciences Program, Sunnybrook Health Sciences Centre, Toronto, ON, Canada
- Department of Medicine, University of Toronto, Toronto, ON, Canada
| | - Tommaso Sanna
- Fondazione Policlinico Gemelli IRCCS, Rome, Italy
- Catholic University of the Sacred Heart, Institute of Cardiology, Rome, Italy
| | - Rolf Wachter
- Department of Cardiology, University Hospital Leipzig, Leipzig, Germany
- Clinic for Cardiology and Pneumology, University Medicine Göttingen, Germany
- German Centre for Cardiovascular Research (DZHK), Partner Site Göttingen, Germany
| | - Gerasimos Filippatos
- Second Department of Cardiology, National and Kapodistrian University of Athens, School of Medicine, Athens, Greece
| | - Aristeidis H Katsanos
- Division of Neurology, McMaster University and Population Health Research Institute, Hamilton, ON, Canada
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Decker SM, Alexander DA, Bruza P, Zhang R, Chen E, Jarvis LA, Gladstone DJ, Pogue BW. Performance comparison of quantitative metrics for analysis of in vivo Cherenkov imaging incident detection during radiotherapy. Br J Radiol 2022; 95:20211346. [PMID: 35834415 PMCID: PMC10996952 DOI: 10.1259/bjr.20211346] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2021] [Revised: 06/06/2022] [Accepted: 06/10/2022] [Indexed: 11/05/2022] Open
Abstract
OBJECTIVES Examine the responses of multiple image similarity metrics to detect patient positioning errors in radiotherapy observed through Cherenkov imaging, which may be used to optimize automated incident detection. METHODS An anthropomorphic phantom mimicking patient vasculature, a biological marker seen in Cherenkov images, was simulated for a breast radiotherapy treatment. The phantom was systematically shifted in each translational direction, and Cherenkov images were captured during treatment delivery at each step. The responses of mutual information (MI) and the γ passing rate (%GP) were compared to that of existing field-shape matching image metrics, the Dice coefficient, and mean distance to conformity (MDC). Patient images containing other incidents were analyzed to verify the best detection algorithm for different incident types. RESULTS Positional shifts in all directions were registered by both MI and %GP, degrading monotonically as the shifts increased. Shifts in intensity, which may result from erythema or bolus-tissue air gaps, were detected most by %GP. However, neither metric detected beam-shape misalignment, such as that caused by dose to unintended areas, as well as currently employed metrics (Dice and MDC). CONCLUSIONS This study indicates that different radiotherapy incidents may be detected by comparing both inter- and intrafractional Cherenkov images with a corresponding image similarity metric, varying with the type of incident. Future work will involve determining appropriate thresholds per metric for automatic flagging. ADVANCES IN KNOWLEDGE Classifying different algorithms for the detection of various radiotherapy incidents allows for the development of an automatic flagging system, eliminating the burden of manual review of Cherenkov images.
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Affiliation(s)
- Savannah M Decker
- Thayer School of Engineering, Dartmouth College,
Hanover, New Hampshire, United
States
| | - Daniel A Alexander
- Thayer School of Engineering, Dartmouth College,
Hanover, New Hampshire, United
States
- DoseOptics LLC, Lebanon, New
Hampshire, United States
| | - Petr Bruza
- Thayer School of Engineering, Dartmouth College,
Hanover, New Hampshire, United
States
- DoseOptics LLC, Lebanon, New
Hampshire, United States
| | - Rongxiao Zhang
- Thayer School of Engineering, Dartmouth College,
Hanover, New Hampshire, United
States
- Geisel School of Medicine, Dartmouth College,
Hanover, New Hampshire, United
States
- Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical
Center, Lebanon, New Hampshire,
United States
| | - Erli Chen
- Cheshire Medical Center, Keene
NH, United States
| | - Lesley A Jarvis
- Geisel School of Medicine, Dartmouth College,
Hanover, New Hampshire, United
States
- Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical
Center, Lebanon, New Hampshire,
United States
| | - David J Gladstone
- Thayer School of Engineering, Dartmouth College,
Hanover, New Hampshire, United
States
| | - Brian W Pogue
- Thayer School of Engineering, Dartmouth College,
Hanover, New Hampshire, United
States
- DoseOptics LLC, Lebanon, New
Hampshire, United States
- Department of Medical Physics, University of
Wisconsin-Madison, Madison,
Wisconsin, United States
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27
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Menon BK, Buck BH, Singh N, Deschaintre Y, Almekhlafi MA, Coutts SB, Thirunavukkarasu S, Khosravani H, Appireddy R, Moreau F, Gubitz G, Tkach A, Catanese L, Dowlatshahi D, Medvedev G, Mandzia J, Pikula A, Shankar J, Williams H, Field TS, Manosalva A, Siddiqui M, Zafar A, Imoukhuede O, Hunter G, Demchuk AM, Mishra S, Gioia LC, Jalini S, Cayer C, Phillips S, Elamin E, Shoamanesh A, Subramaniam S, Kate M, Jacquin G, Camden MC, Benali F, Alhabli I, Bala F, Horn M, Stotts G, Hill MD, Gladstone DJ, Poppe A, Sehgal A, Zhang Q, Lethebe BC, Doram C, Ademola A, Shamy M, Kenney C, Sajobi TT, Swartz RH. Intravenous tenecteplase compared with alteplase for acute ischaemic stroke in Canada (AcT): a pragmatic, multicentre, open-label, registry-linked, randomised, controlled, non-inferiority trial. Lancet 2022; 400:161-169. [PMID: 35779553 DOI: 10.1016/s0140-6736(22)01054-6] [Citation(s) in RCA: 114] [Impact Index Per Article: 57.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/23/2022] [Revised: 05/30/2022] [Accepted: 06/08/2022] [Indexed: 12/11/2022]
Abstract
BACKGROUND Intravenous thrombolysis with alteplase bolus followed by infusion is a global standard of care for patients with acute ischaemic stroke. We aimed to determine whether tenecteplase given as a single bolus might increase reperfusion compared with this standard of care. METHODS In this multicentre, open-label, parallel-group, registry-linked, randomised, controlled trial (AcT), patients were enrolled from 22 primary and comprehensive stroke centres across Canada. Patients were eligible for inclusion if they were aged 18 years or older, with a diagnosis of ischaemic stroke causing disabling neurological deficit, presenting within 4·5 h of symptom onset, and eligible for thrombolysis per Canadian guidelines. Eligible patients were randomly assigned (1:1), using a previously validated minimal sufficient balance algorithm to balance allocation by site and a secure real-time web-based server, to either intravenous tenecteplase (0·25 mg/kg to a maximum of 25 mg) or alteplase (0·9 mg/kg to a maximum of 90mg; 0·09 mg/kg as a bolus and then a 60 min infusion of the remaining 0·81 mg/kg). The primary outcome was the proportion of patients who had a modified Rankin Scale (mRS) score of 0-1 at 90-120 days after treatment, assessed via blinded review in the intention-to-treat (ITT) population (ie, all patients randomly assigned to treatment who did not withdraw consent). Non-inferiority was met if the lower 95% CI of the difference in the proportion of patients who met the primary outcome between the tenecteplase and alteplase groups was more than -5%. Safety was assessed in all patients who received any of either thrombolytic agent and who were reported as treated. The trial is registered with ClinicalTrials.gov, NCT03889249, and is closed to accrual. FINDINGS Between Dec 10, 2019, and Jan 25, 2022, 1600 patients were enrolled and randomly assigned to tenecteplase (n=816) or alteplase (n=784), of whom 1577 were included in the ITT population (n=806 tenecteplase; n=771 alteplase). The median age was 74 years (IQR 63-83), 755 (47·9%) of 1577 patients were female and 822 (52·1%) were male. As of data cutoff (Jan 21, 2022), 296 (36·9%) of 802 patients in the tenecteplase group and 266 (34·8%) of 765 in the alteplase group had an mRS score of 0-1 at 90-120 days (unadjusted risk difference 2·1% [95% CI - 2·6 to 6·9], meeting the prespecified non-inferiority threshold). In safety analyses, 27 (3·4%) of 800 patients in the tenecteplase group and 24 (3·2%) of 763 in the alteplase group had 24 h symptomatic intracerebral haemorrhage and 122 (15·3%) of 796 and 117 (15·4%) of 763 died within 90 days of starting treatment INTERPRETATION: Intravenous tenecteplase (0·25 mg/kg) is a reasonable alternative to alteplase for all patients presenting with acute ischaemic stroke who meet standard criteria for thrombolysis. FUNDING Canadian Institutes of Health Research, Alberta Strategy for Patient Oriented Research Support Unit.
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Affiliation(s)
- Bijoy K Menon
- Department of Clinical Neurosciences, University of Calgary, Calgary, AB, Canada; Department of Radiology, University of Calgary, Calgary, AB, Canada; Cumming School of Medicine and Department of Community Health Sciences, University of Calgary, Calgary, AB, Canada; Hotchkiss Brain Institute, Calgary, Canada.
| | - Brian H Buck
- Division of Neurology, Department of Medicine, University of Alberta, Edmonton, AB, Canada
| | - Nishita Singh
- Department of Clinical Neurosciences, University of Calgary, Calgary, AB, Canada
| | - Yan Deschaintre
- Department of Neurosciences, Université de Montréal, Montreal, QC, Canada; Centre Hospitalier de l'Université de Montréal (CHUM), Montreal, QC, Canada
| | - Mohammed A Almekhlafi
- Department of Clinical Neurosciences, University of Calgary, Calgary, AB, Canada; Department of Radiology, University of Calgary, Calgary, AB, Canada; Cumming School of Medicine and Department of Community Health Sciences, University of Calgary, Calgary, AB, Canada; Hotchkiss Brain Institute, Calgary, Canada
| | - Shelagh B Coutts
- Department of Clinical Neurosciences, University of Calgary, Calgary, AB, Canada; Department of Radiology, University of Calgary, Calgary, AB, Canada; Cumming School of Medicine and Department of Community Health Sciences, University of Calgary, Calgary, AB, Canada; Hotchkiss Brain Institute, Calgary, Canada
| | - Sibi Thirunavukkarasu
- Division of Neurology, Department of Medicine, University of Alberta, Edmonton, AB, Canada
| | - Houman Khosravani
- Department of Medicine (Division of Neurology), Hurvitz Brain Sciences Program, Sunnybrook Health Sciences Centre, University of Toronto, Toronto, ON, Canada
| | - Ramana Appireddy
- Division of Neurology, Department of Medicine, Queen's University, Kingston, ON, Canada
| | | | - Gord Gubitz
- Queen Elizabeth Health Sciences Centre, Halifax, NS, Canada
| | | | - Luciana Catanese
- Hamilton Health Sciences Centre and McMaster University, Hamilton, ON, Canada
| | - Dar Dowlatshahi
- Department of Medicine, University of Ottawa and the Ottawa Heart Research Institute, Ottawa, ON, Canada
| | - George Medvedev
- University of British Columbia and the Fraser Health Authority, New Westminster, BC, Canada
| | - Jennifer Mandzia
- London Health Sciences Centre and Western University, London, ON, Canada
| | - Aleksandra Pikula
- Toronto Western Hospital and the University of Toronto, Toronto, ON, Canada
| | - Jai Shankar
- University of Manitoba, Winnipeg, MB, Canada
| | | | - Thalia S Field
- Vancouver Stroke Program and the Division of Neurology, University of British Columbia, Vancouver, BC, Canada
| | | | | | - Atif Zafar
- St Michael's Hospital, Toronto, ON, Canada
| | | | - Gary Hunter
- University of Saskatchewan, Saskatoon, SK, Canada
| | - Andrew M Demchuk
- Department of Clinical Neurosciences, University of Calgary, Calgary, AB, Canada; Department of Radiology, University of Calgary, Calgary, AB, Canada; Cumming School of Medicine and Department of Community Health Sciences, University of Calgary, Calgary, AB, Canada; Hotchkiss Brain Institute, Calgary, Canada
| | - Sachin Mishra
- Division of Neurology, Department of Medicine, University of Alberta, Edmonton, AB, Canada
| | - Laura C Gioia
- Department of Neurosciences, Université de Montréal, Montreal, QC, Canada; Centre Hospitalier de l'Université de Montréal (CHUM), Montreal, QC, Canada
| | - Shirin Jalini
- Division of Neurology, Department of Medicine, Queen's University, Kingston, ON, Canada
| | - Caroline Cayer
- Centre de recherche du CHUS, Centre intégré Universitaire de Santé et des Services Sociaux de l'Estrie, Sherbrooke, QC, Canada
| | | | | | - Ashkan Shoamanesh
- Hamilton Health Sciences Centre and McMaster University, Hamilton, ON, Canada
| | - Suresh Subramaniam
- Department of Clinical Neurosciences, University of Calgary, Calgary, AB, Canada
| | - Mahesh Kate
- Division of Neurology, Department of Medicine, University of Alberta, Edmonton, AB, Canada
| | - Gregory Jacquin
- Department of Neurosciences, Université de Montréal, Montreal, QC, Canada; Centre Hospitalier de l'Université de Montréal (CHUM), Montreal, QC, Canada
| | - Marie-Christine Camden
- Enfant-Jésus Hospital, Centre Hospitalier Universitaire de Québec, Laval University, Québec City, QC, Canada
| | - Faysal Benali
- Department of Clinical Neurosciences, University of Calgary, Calgary, AB, Canada
| | - Ibrahim Alhabli
- Department of Clinical Neurosciences, University of Calgary, Calgary, AB, Canada
| | - Fouzi Bala
- Department of Clinical Neurosciences, University of Calgary, Calgary, AB, Canada
| | - MacKenzie Horn
- Department of Clinical Neurosciences, University of Calgary, Calgary, AB, Canada
| | - Grant Stotts
- Department of Medicine, University of Ottawa and the Ottawa Heart Research Institute, Ottawa, ON, Canada
| | - Michael D Hill
- Department of Clinical Neurosciences, University of Calgary, Calgary, AB, Canada; Department of Radiology, University of Calgary, Calgary, AB, Canada; Cumming School of Medicine and Department of Community Health Sciences, University of Calgary, Calgary, AB, Canada; Hotchkiss Brain Institute, Calgary, Canada
| | - David J Gladstone
- Department of Medicine (Division of Neurology), Hurvitz Brain Sciences Program, Sunnybrook Health Sciences Centre, University of Toronto, Toronto, ON, Canada
| | - Alexandre Poppe
- Department of Neurosciences, Université de Montréal, Montreal, QC, Canada; Centre Hospitalier de l'Université de Montréal (CHUM), Montreal, QC, Canada
| | - Arshia Sehgal
- Department of Clinical Neurosciences, University of Calgary, Calgary, AB, Canada
| | - Qiao Zhang
- Department of Clinical Neurosciences, University of Calgary, Calgary, AB, Canada
| | - Brendan Cord Lethebe
- Cumming School of Medicine and Department of Community Health Sciences, University of Calgary, Calgary, AB, Canada
| | - Craig Doram
- Department of Clinical Neurosciences, University of Calgary, Calgary, AB, Canada
| | - Ayoola Ademola
- Department of Clinical Neurosciences, University of Calgary, Calgary, AB, Canada; Cumming School of Medicine and Department of Community Health Sciences, University of Calgary, Calgary, AB, Canada
| | - Michel Shamy
- Department of Medicine, University of Ottawa and the Ottawa Heart Research Institute, Ottawa, ON, Canada
| | - Carol Kenney
- Department of Clinical Neurosciences, University of Calgary, Calgary, AB, Canada
| | - Tolulope T Sajobi
- Department of Clinical Neurosciences, University of Calgary, Calgary, AB, Canada; Cumming School of Medicine and Department of Community Health Sciences, University of Calgary, Calgary, AB, Canada
| | - Richard H Swartz
- Department of Medicine (Division of Neurology), Hurvitz Brain Sciences Program, Sunnybrook Health Sciences Centre, University of Toronto, Toronto, ON, Canada
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28
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Zhang R, Rahman M, Bruza P, Thomas CR, Jarvis LA, Hoopes PJ, Gladstone DJ, Pogue BW. Electron flash-RT program in clinical setting for human translation. J Clin Oncol 2022. [DOI: 10.1200/jco.2022.40.16_suppl.e13596] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
e13596 Background: A FLASH-RT program was established at Dartmouth-Hitchcock Medical Center in minimally-modified clinical setting by joint efforts of biomedical engineering, radiation oncology, radiation biology and medical physics teams. Various projects on dosimetry, chemical sensing, molecular profiling, software/hardware development, and translational studies have been conducted. The aim is to share logistical considerations and experience on running a FLASH-RT program to support institution-wide academic activities with an ultimate goal of treating human patients with FLASH-RT in 2022. Methods: A linac was converted in the clinical setting by qualified engineers to deliver an ultra-high dose rate (UHDR) electron beam. Routine safety and dosimetry checks were done by physicists for every reversible conversion. Long-term record-keeping and retrospective surveys were carried out to demonstrate the feasibility, safety, stability and accuracy of this dual-purpose (FLASH and conventional RT) approach. Comprehensive failure mode and effects analysis (FMEA) has been completed to systematically evaluate safety related considerations. A treatment planning system (TPS) has been developed in Varian Eclipse to facilitated comparative studies. The FLASH-capable linac has been utilized as shared resource to support institution-wide academic activities as well as normal clinical treatments. Results: With its safety (no accident or FLASH-related malfunction), flexibility (> 100 conversions in 2 years), reliability (̃6000 hours in flash mode and ̃5x105 Gy accumulative dose delivered at isocenter) and accuracy (̃5% conversion-to-conversion variations) demonstrated by commissioning, long-term user experience and comprehensive FMEA analysis, the FLASH-RT platform has been actively utilized for researches in six major categories 1) FLASH beam dosimetry; 2) real-time beam delivery monitoring and control; 3) oximetry and chemical sensing; 4) preclinical/translational small/large animal treatment with tumor control and normal tissue complication endpoints, 5) treatment plan and delivery optimization; 6) the design of phase I/II trials. Key findings in each category will be reported. Conclusions: A FLASH-RT program in clinical setting is established at Dartmouth with joint efforts, promoting collaborative projects to advance FLASH-RT to clinical treatment. The system has been reliably utilized for over two years for mechanistic as well as translational studies and support a phase I/II trial treating cutaneous lymphoma with eFLASH-RT.
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Affiliation(s)
| | | | | | - Charles R. Thomas
- Geisel School of Medicine at Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, NH
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29
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Tsivgoulis G, Triantafyllou S, Palaiodimou L, Grory BM, Deftereos S, Köhrmann M, Dilaveris P, Ricci B, Tsioufis K, Cutting S, Magiorkinis G, Krogias C, Schellinger PD, Dardiotis E, Rodriguez-Campello A, Cuadrado-Godia E, Aguiar de Sousa D, Sharma M, Gladstone DJ, Sanna T, Wachter R, Furie KL, Alexandrov AV, Yaghi S, Katsanos AH. Prolonged Cardiac Monitoring and Stroke Recurrence: A Meta-analysis. Neurology 2022; 98:e1942-e1952. [PMID: 35264426 DOI: 10.1212/wnl.0000000000200227] [Citation(s) in RCA: 27] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2021] [Accepted: 02/01/2022] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND AND OBJECTIVES Prolonged poststroke cardiac rhythm monitoring (PCM) reveals a substantial proportion of patients with ischemic stroke (IS) with atrial fibrillation (AF) not detected by conventional rhythm monitoring strategies. We evaluated the association between PCM and the institution of stroke preventive strategies and stroke recurrence. METHODS We searched MEDLINE and SCOPUS databases to identify studies reporting stroke recurrence rates in patients with history of recent IS or TIA receiving PCM compared with patients receiving conventional cardiac rhythm monitoring. Pairwise meta-analyses were performed under the random effects model. To explore for differences between the monitoring strategies, we combined direct and indirect evidence for any given pair of monitoring devices assessed within a randomized controlled trial (RCT). RESULTS We included 8 studies (5 RCTs, 3 observational; 2,994 patients). Patients receiving PCM after their index event had a higher rate of AF detection and anticoagulant initiation in RCTs (risk ratio [RR] 3.91, 95% CI 2.54-6.03; RR 2.16, 95% CI 1.66-2.80, respectively) and observational studies (RR 2.06, 95% CI 1.57-2.70; RR 2.01, 95% CI 1.43-2.83, respectively). PCM was associated with a lower risk of recurrent stroke during follow-up in observational studies (RR 0.29, 95% CI 0.15-0.59), but not in RCTs (RR 0.72, 95% CI 0.49-1.07). In indirect analyses of RCTs, the likelihood of AF detection and anticoagulation initiation was higher for implantable loop recorders compared with Holter monitors and external loop recorders. DISCUSSION PCM after an IS or TIA can lead to higher rates of AF detection and anticoagulant initiation. There is no solid RCT evidence supporting that PCM may be associated with lower stroke recurrence risk.
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Affiliation(s)
- Georgios Tsivgoulis
- From the Second Department of Neurology (G.T., S.T., L.P., A.H.K.) and Second Department of Cardiology (S.D.), School of Medicine, "Attikon" Hospital, First Department of Cardiology (P.D., K.T.), School of Medicine, Hippokration Hospital, and Hygiene, Epidemiology and Medical Statistics, Medical School (G.M.), National and Kapodistrian University of Athens, Greece; Department of Neurology (G.T., A.V.A.), University of Tennessee Health Science Center, Memphis; Duke University School of Medicine (B.M.G.), Durham, NC; Department of Neurology (M.K.), Universitätsklinikum Essen, Germany; Department of Neurology (B.R., S.C., K.L.F.), Alpert Medical School, Brown University, Providence, RI; Department of Neurology (C.K.), St. Josef-Hospital, Ruhr University, Bochum; Departments of Neurology and Neurogeriatry (P.D.S.), Johannes Wesling Medical Center, Ruhr University Bochum, Minden, Germany; Department of Neurology (E.D.), University of Thessaly, Larissa, Greece; Stroke Unit (A.R.-C., E.C.-G.), Department of Neurology, Group of Research on Neurovascular Diseases, Hospital Del Mar Medical Research Institute. DCEX, Universitat Pompeu Fabra, Universitat Autonoma de Barcelona, Spain; Department of Neurosciences (Neurology) (D.A.d.S.), Hospital de Santa Maria, University of Lisbon, Portugal; Division of Neurology (M.S., A.H.K.), McMaster University and Population Health Research Institute, Hamilton; Sunnybrook Research Institute and Hurvitz Brain Sciences Program (D.J.G.), Sunnybrook Health Sciences Centre, and Department of Medicine, University of Toronto, Canada; Fondazione Policlinico Gemelli IRCCS (T.S.); Catholic University of the Sacred Heart (T.S.), Institute of Cardiology, Rome, Italy; Clinic and Policlinic for Cardiology (R.W.), University Hospital Leipzig, Germany; and Department of Neurology (S.Y.), New York University School of Medicine, NY
| | - Sokratis Triantafyllou
- From the Second Department of Neurology (G.T., S.T., L.P., A.H.K.) and Second Department of Cardiology (S.D.), School of Medicine, "Attikon" Hospital, First Department of Cardiology (P.D., K.T.), School of Medicine, Hippokration Hospital, and Hygiene, Epidemiology and Medical Statistics, Medical School (G.M.), National and Kapodistrian University of Athens, Greece; Department of Neurology (G.T., A.V.A.), University of Tennessee Health Science Center, Memphis; Duke University School of Medicine (B.M.G.), Durham, NC; Department of Neurology (M.K.), Universitätsklinikum Essen, Germany; Department of Neurology (B.R., S.C., K.L.F.), Alpert Medical School, Brown University, Providence, RI; Department of Neurology (C.K.), St. Josef-Hospital, Ruhr University, Bochum; Departments of Neurology and Neurogeriatry (P.D.S.), Johannes Wesling Medical Center, Ruhr University Bochum, Minden, Germany; Department of Neurology (E.D.), University of Thessaly, Larissa, Greece; Stroke Unit (A.R.-C., E.C.-G.), Department of Neurology, Group of Research on Neurovascular Diseases, Hospital Del Mar Medical Research Institute. DCEX, Universitat Pompeu Fabra, Universitat Autonoma de Barcelona, Spain; Department of Neurosciences (Neurology) (D.A.d.S.), Hospital de Santa Maria, University of Lisbon, Portugal; Division of Neurology (M.S., A.H.K.), McMaster University and Population Health Research Institute, Hamilton; Sunnybrook Research Institute and Hurvitz Brain Sciences Program (D.J.G.), Sunnybrook Health Sciences Centre, and Department of Medicine, University of Toronto, Canada; Fondazione Policlinico Gemelli IRCCS (T.S.); Catholic University of the Sacred Heart (T.S.), Institute of Cardiology, Rome, Italy; Clinic and Policlinic for Cardiology (R.W.), University Hospital Leipzig, Germany; and Department of Neurology (S.Y.), New York University School of Medicine, NY
| | - Lina Palaiodimou
- From the Second Department of Neurology (G.T., S.T., L.P., A.H.K.) and Second Department of Cardiology (S.D.), School of Medicine, "Attikon" Hospital, First Department of Cardiology (P.D., K.T.), School of Medicine, Hippokration Hospital, and Hygiene, Epidemiology and Medical Statistics, Medical School (G.M.), National and Kapodistrian University of Athens, Greece; Department of Neurology (G.T., A.V.A.), University of Tennessee Health Science Center, Memphis; Duke University School of Medicine (B.M.G.), Durham, NC; Department of Neurology (M.K.), Universitätsklinikum Essen, Germany; Department of Neurology (B.R., S.C., K.L.F.), Alpert Medical School, Brown University, Providence, RI; Department of Neurology (C.K.), St. Josef-Hospital, Ruhr University, Bochum; Departments of Neurology and Neurogeriatry (P.D.S.), Johannes Wesling Medical Center, Ruhr University Bochum, Minden, Germany; Department of Neurology (E.D.), University of Thessaly, Larissa, Greece; Stroke Unit (A.R.-C., E.C.-G.), Department of Neurology, Group of Research on Neurovascular Diseases, Hospital Del Mar Medical Research Institute. DCEX, Universitat Pompeu Fabra, Universitat Autonoma de Barcelona, Spain; Department of Neurosciences (Neurology) (D.A.d.S.), Hospital de Santa Maria, University of Lisbon, Portugal; Division of Neurology (M.S., A.H.K.), McMaster University and Population Health Research Institute, Hamilton; Sunnybrook Research Institute and Hurvitz Brain Sciences Program (D.J.G.), Sunnybrook Health Sciences Centre, and Department of Medicine, University of Toronto, Canada; Fondazione Policlinico Gemelli IRCCS (T.S.); Catholic University of the Sacred Heart (T.S.), Institute of Cardiology, Rome, Italy; Clinic and Policlinic for Cardiology (R.W.), University Hospital Leipzig, Germany; and Department of Neurology (S.Y.), New York University School of Medicine, NY
| | - Brian Mac Grory
- From the Second Department of Neurology (G.T., S.T., L.P., A.H.K.) and Second Department of Cardiology (S.D.), School of Medicine, "Attikon" Hospital, First Department of Cardiology (P.D., K.T.), School of Medicine, Hippokration Hospital, and Hygiene, Epidemiology and Medical Statistics, Medical School (G.M.), National and Kapodistrian University of Athens, Greece; Department of Neurology (G.T., A.V.A.), University of Tennessee Health Science Center, Memphis; Duke University School of Medicine (B.M.G.), Durham, NC; Department of Neurology (M.K.), Universitätsklinikum Essen, Germany; Department of Neurology (B.R., S.C., K.L.F.), Alpert Medical School, Brown University, Providence, RI; Department of Neurology (C.K.), St. Josef-Hospital, Ruhr University, Bochum; Departments of Neurology and Neurogeriatry (P.D.S.), Johannes Wesling Medical Center, Ruhr University Bochum, Minden, Germany; Department of Neurology (E.D.), University of Thessaly, Larissa, Greece; Stroke Unit (A.R.-C., E.C.-G.), Department of Neurology, Group of Research on Neurovascular Diseases, Hospital Del Mar Medical Research Institute. DCEX, Universitat Pompeu Fabra, Universitat Autonoma de Barcelona, Spain; Department of Neurosciences (Neurology) (D.A.d.S.), Hospital de Santa Maria, University of Lisbon, Portugal; Division of Neurology (M.S., A.H.K.), McMaster University and Population Health Research Institute, Hamilton; Sunnybrook Research Institute and Hurvitz Brain Sciences Program (D.J.G.), Sunnybrook Health Sciences Centre, and Department of Medicine, University of Toronto, Canada; Fondazione Policlinico Gemelli IRCCS (T.S.); Catholic University of the Sacred Heart (T.S.), Institute of Cardiology, Rome, Italy; Clinic and Policlinic for Cardiology (R.W.), University Hospital Leipzig, Germany; and Department of Neurology (S.Y.), New York University School of Medicine, NY
| | - Spyridon Deftereos
- From the Second Department of Neurology (G.T., S.T., L.P., A.H.K.) and Second Department of Cardiology (S.D.), School of Medicine, "Attikon" Hospital, First Department of Cardiology (P.D., K.T.), School of Medicine, Hippokration Hospital, and Hygiene, Epidemiology and Medical Statistics, Medical School (G.M.), National and Kapodistrian University of Athens, Greece; Department of Neurology (G.T., A.V.A.), University of Tennessee Health Science Center, Memphis; Duke University School of Medicine (B.M.G.), Durham, NC; Department of Neurology (M.K.), Universitätsklinikum Essen, Germany; Department of Neurology (B.R., S.C., K.L.F.), Alpert Medical School, Brown University, Providence, RI; Department of Neurology (C.K.), St. Josef-Hospital, Ruhr University, Bochum; Departments of Neurology and Neurogeriatry (P.D.S.), Johannes Wesling Medical Center, Ruhr University Bochum, Minden, Germany; Department of Neurology (E.D.), University of Thessaly, Larissa, Greece; Stroke Unit (A.R.-C., E.C.-G.), Department of Neurology, Group of Research on Neurovascular Diseases, Hospital Del Mar Medical Research Institute. DCEX, Universitat Pompeu Fabra, Universitat Autonoma de Barcelona, Spain; Department of Neurosciences (Neurology) (D.A.d.S.), Hospital de Santa Maria, University of Lisbon, Portugal; Division of Neurology (M.S., A.H.K.), McMaster University and Population Health Research Institute, Hamilton; Sunnybrook Research Institute and Hurvitz Brain Sciences Program (D.J.G.), Sunnybrook Health Sciences Centre, and Department of Medicine, University of Toronto, Canada; Fondazione Policlinico Gemelli IRCCS (T.S.); Catholic University of the Sacred Heart (T.S.), Institute of Cardiology, Rome, Italy; Clinic and Policlinic for Cardiology (R.W.), University Hospital Leipzig, Germany; and Department of Neurology (S.Y.), New York University School of Medicine, NY
| | - Martin Köhrmann
- From the Second Department of Neurology (G.T., S.T., L.P., A.H.K.) and Second Department of Cardiology (S.D.), School of Medicine, "Attikon" Hospital, First Department of Cardiology (P.D., K.T.), School of Medicine, Hippokration Hospital, and Hygiene, Epidemiology and Medical Statistics, Medical School (G.M.), National and Kapodistrian University of Athens, Greece; Department of Neurology (G.T., A.V.A.), University of Tennessee Health Science Center, Memphis; Duke University School of Medicine (B.M.G.), Durham, NC; Department of Neurology (M.K.), Universitätsklinikum Essen, Germany; Department of Neurology (B.R., S.C., K.L.F.), Alpert Medical School, Brown University, Providence, RI; Department of Neurology (C.K.), St. Josef-Hospital, Ruhr University, Bochum; Departments of Neurology and Neurogeriatry (P.D.S.), Johannes Wesling Medical Center, Ruhr University Bochum, Minden, Germany; Department of Neurology (E.D.), University of Thessaly, Larissa, Greece; Stroke Unit (A.R.-C., E.C.-G.), Department of Neurology, Group of Research on Neurovascular Diseases, Hospital Del Mar Medical Research Institute. DCEX, Universitat Pompeu Fabra, Universitat Autonoma de Barcelona, Spain; Department of Neurosciences (Neurology) (D.A.d.S.), Hospital de Santa Maria, University of Lisbon, Portugal; Division of Neurology (M.S., A.H.K.), McMaster University and Population Health Research Institute, Hamilton; Sunnybrook Research Institute and Hurvitz Brain Sciences Program (D.J.G.), Sunnybrook Health Sciences Centre, and Department of Medicine, University of Toronto, Canada; Fondazione Policlinico Gemelli IRCCS (T.S.); Catholic University of the Sacred Heart (T.S.), Institute of Cardiology, Rome, Italy; Clinic and Policlinic for Cardiology (R.W.), University Hospital Leipzig, Germany; and Department of Neurology (S.Y.), New York University School of Medicine, NY
| | - Polychronis Dilaveris
- From the Second Department of Neurology (G.T., S.T., L.P., A.H.K.) and Second Department of Cardiology (S.D.), School of Medicine, "Attikon" Hospital, First Department of Cardiology (P.D., K.T.), School of Medicine, Hippokration Hospital, and Hygiene, Epidemiology and Medical Statistics, Medical School (G.M.), National and Kapodistrian University of Athens, Greece; Department of Neurology (G.T., A.V.A.), University of Tennessee Health Science Center, Memphis; Duke University School of Medicine (B.M.G.), Durham, NC; Department of Neurology (M.K.), Universitätsklinikum Essen, Germany; Department of Neurology (B.R., S.C., K.L.F.), Alpert Medical School, Brown University, Providence, RI; Department of Neurology (C.K.), St. Josef-Hospital, Ruhr University, Bochum; Departments of Neurology and Neurogeriatry (P.D.S.), Johannes Wesling Medical Center, Ruhr University Bochum, Minden, Germany; Department of Neurology (E.D.), University of Thessaly, Larissa, Greece; Stroke Unit (A.R.-C., E.C.-G.), Department of Neurology, Group of Research on Neurovascular Diseases, Hospital Del Mar Medical Research Institute. DCEX, Universitat Pompeu Fabra, Universitat Autonoma de Barcelona, Spain; Department of Neurosciences (Neurology) (D.A.d.S.), Hospital de Santa Maria, University of Lisbon, Portugal; Division of Neurology (M.S., A.H.K.), McMaster University and Population Health Research Institute, Hamilton; Sunnybrook Research Institute and Hurvitz Brain Sciences Program (D.J.G.), Sunnybrook Health Sciences Centre, and Department of Medicine, University of Toronto, Canada; Fondazione Policlinico Gemelli IRCCS (T.S.); Catholic University of the Sacred Heart (T.S.), Institute of Cardiology, Rome, Italy; Clinic and Policlinic for Cardiology (R.W.), University Hospital Leipzig, Germany; and Department of Neurology (S.Y.), New York University School of Medicine, NY
| | - Brittany Ricci
- From the Second Department of Neurology (G.T., S.T., L.P., A.H.K.) and Second Department of Cardiology (S.D.), School of Medicine, "Attikon" Hospital, First Department of Cardiology (P.D., K.T.), School of Medicine, Hippokration Hospital, and Hygiene, Epidemiology and Medical Statistics, Medical School (G.M.), National and Kapodistrian University of Athens, Greece; Department of Neurology (G.T., A.V.A.), University of Tennessee Health Science Center, Memphis; Duke University School of Medicine (B.M.G.), Durham, NC; Department of Neurology (M.K.), Universitätsklinikum Essen, Germany; Department of Neurology (B.R., S.C., K.L.F.), Alpert Medical School, Brown University, Providence, RI; Department of Neurology (C.K.), St. Josef-Hospital, Ruhr University, Bochum; Departments of Neurology and Neurogeriatry (P.D.S.), Johannes Wesling Medical Center, Ruhr University Bochum, Minden, Germany; Department of Neurology (E.D.), University of Thessaly, Larissa, Greece; Stroke Unit (A.R.-C., E.C.-G.), Department of Neurology, Group of Research on Neurovascular Diseases, Hospital Del Mar Medical Research Institute. DCEX, Universitat Pompeu Fabra, Universitat Autonoma de Barcelona, Spain; Department of Neurosciences (Neurology) (D.A.d.S.), Hospital de Santa Maria, University of Lisbon, Portugal; Division of Neurology (M.S., A.H.K.), McMaster University and Population Health Research Institute, Hamilton; Sunnybrook Research Institute and Hurvitz Brain Sciences Program (D.J.G.), Sunnybrook Health Sciences Centre, and Department of Medicine, University of Toronto, Canada; Fondazione Policlinico Gemelli IRCCS (T.S.); Catholic University of the Sacred Heart (T.S.), Institute of Cardiology, Rome, Italy; Clinic and Policlinic for Cardiology (R.W.), University Hospital Leipzig, Germany; and Department of Neurology (S.Y.), New York University School of Medicine, NY
| | - Konstantinos Tsioufis
- From the Second Department of Neurology (G.T., S.T., L.P., A.H.K.) and Second Department of Cardiology (S.D.), School of Medicine, "Attikon" Hospital, First Department of Cardiology (P.D., K.T.), School of Medicine, Hippokration Hospital, and Hygiene, Epidemiology and Medical Statistics, Medical School (G.M.), National and Kapodistrian University of Athens, Greece; Department of Neurology (G.T., A.V.A.), University of Tennessee Health Science Center, Memphis; Duke University School of Medicine (B.M.G.), Durham, NC; Department of Neurology (M.K.), Universitätsklinikum Essen, Germany; Department of Neurology (B.R., S.C., K.L.F.), Alpert Medical School, Brown University, Providence, RI; Department of Neurology (C.K.), St. Josef-Hospital, Ruhr University, Bochum; Departments of Neurology and Neurogeriatry (P.D.S.), Johannes Wesling Medical Center, Ruhr University Bochum, Minden, Germany; Department of Neurology (E.D.), University of Thessaly, Larissa, Greece; Stroke Unit (A.R.-C., E.C.-G.), Department of Neurology, Group of Research on Neurovascular Diseases, Hospital Del Mar Medical Research Institute. DCEX, Universitat Pompeu Fabra, Universitat Autonoma de Barcelona, Spain; Department of Neurosciences (Neurology) (D.A.d.S.), Hospital de Santa Maria, University of Lisbon, Portugal; Division of Neurology (M.S., A.H.K.), McMaster University and Population Health Research Institute, Hamilton; Sunnybrook Research Institute and Hurvitz Brain Sciences Program (D.J.G.), Sunnybrook Health Sciences Centre, and Department of Medicine, University of Toronto, Canada; Fondazione Policlinico Gemelli IRCCS (T.S.); Catholic University of the Sacred Heart (T.S.), Institute of Cardiology, Rome, Italy; Clinic and Policlinic for Cardiology (R.W.), University Hospital Leipzig, Germany; and Department of Neurology (S.Y.), New York University School of Medicine, NY
| | - Shawna Cutting
- From the Second Department of Neurology (G.T., S.T., L.P., A.H.K.) and Second Department of Cardiology (S.D.), School of Medicine, "Attikon" Hospital, First Department of Cardiology (P.D., K.T.), School of Medicine, Hippokration Hospital, and Hygiene, Epidemiology and Medical Statistics, Medical School (G.M.), National and Kapodistrian University of Athens, Greece; Department of Neurology (G.T., A.V.A.), University of Tennessee Health Science Center, Memphis; Duke University School of Medicine (B.M.G.), Durham, NC; Department of Neurology (M.K.), Universitätsklinikum Essen, Germany; Department of Neurology (B.R., S.C., K.L.F.), Alpert Medical School, Brown University, Providence, RI; Department of Neurology (C.K.), St. Josef-Hospital, Ruhr University, Bochum; Departments of Neurology and Neurogeriatry (P.D.S.), Johannes Wesling Medical Center, Ruhr University Bochum, Minden, Germany; Department of Neurology (E.D.), University of Thessaly, Larissa, Greece; Stroke Unit (A.R.-C., E.C.-G.), Department of Neurology, Group of Research on Neurovascular Diseases, Hospital Del Mar Medical Research Institute. DCEX, Universitat Pompeu Fabra, Universitat Autonoma de Barcelona, Spain; Department of Neurosciences (Neurology) (D.A.d.S.), Hospital de Santa Maria, University of Lisbon, Portugal; Division of Neurology (M.S., A.H.K.), McMaster University and Population Health Research Institute, Hamilton; Sunnybrook Research Institute and Hurvitz Brain Sciences Program (D.J.G.), Sunnybrook Health Sciences Centre, and Department of Medicine, University of Toronto, Canada; Fondazione Policlinico Gemelli IRCCS (T.S.); Catholic University of the Sacred Heart (T.S.), Institute of Cardiology, Rome, Italy; Clinic and Policlinic for Cardiology (R.W.), University Hospital Leipzig, Germany; and Department of Neurology (S.Y.), New York University School of Medicine, NY
| | - Gkikas Magiorkinis
- From the Second Department of Neurology (G.T., S.T., L.P., A.H.K.) and Second Department of Cardiology (S.D.), School of Medicine, "Attikon" Hospital, First Department of Cardiology (P.D., K.T.), School of Medicine, Hippokration Hospital, and Hygiene, Epidemiology and Medical Statistics, Medical School (G.M.), National and Kapodistrian University of Athens, Greece; Department of Neurology (G.T., A.V.A.), University of Tennessee Health Science Center, Memphis; Duke University School of Medicine (B.M.G.), Durham, NC; Department of Neurology (M.K.), Universitätsklinikum Essen, Germany; Department of Neurology (B.R., S.C., K.L.F.), Alpert Medical School, Brown University, Providence, RI; Department of Neurology (C.K.), St. Josef-Hospital, Ruhr University, Bochum; Departments of Neurology and Neurogeriatry (P.D.S.), Johannes Wesling Medical Center, Ruhr University Bochum, Minden, Germany; Department of Neurology (E.D.), University of Thessaly, Larissa, Greece; Stroke Unit (A.R.-C., E.C.-G.), Department of Neurology, Group of Research on Neurovascular Diseases, Hospital Del Mar Medical Research Institute. DCEX, Universitat Pompeu Fabra, Universitat Autonoma de Barcelona, Spain; Department of Neurosciences (Neurology) (D.A.d.S.), Hospital de Santa Maria, University of Lisbon, Portugal; Division of Neurology (M.S., A.H.K.), McMaster University and Population Health Research Institute, Hamilton; Sunnybrook Research Institute and Hurvitz Brain Sciences Program (D.J.G.), Sunnybrook Health Sciences Centre, and Department of Medicine, University of Toronto, Canada; Fondazione Policlinico Gemelli IRCCS (T.S.); Catholic University of the Sacred Heart (T.S.), Institute of Cardiology, Rome, Italy; Clinic and Policlinic for Cardiology (R.W.), University Hospital Leipzig, Germany; and Department of Neurology (S.Y.), New York University School of Medicine, NY
| | - Christos Krogias
- From the Second Department of Neurology (G.T., S.T., L.P., A.H.K.) and Second Department of Cardiology (S.D.), School of Medicine, "Attikon" Hospital, First Department of Cardiology (P.D., K.T.), School of Medicine, Hippokration Hospital, and Hygiene, Epidemiology and Medical Statistics, Medical School (G.M.), National and Kapodistrian University of Athens, Greece; Department of Neurology (G.T., A.V.A.), University of Tennessee Health Science Center, Memphis; Duke University School of Medicine (B.M.G.), Durham, NC; Department of Neurology (M.K.), Universitätsklinikum Essen, Germany; Department of Neurology (B.R., S.C., K.L.F.), Alpert Medical School, Brown University, Providence, RI; Department of Neurology (C.K.), St. Josef-Hospital, Ruhr University, Bochum; Departments of Neurology and Neurogeriatry (P.D.S.), Johannes Wesling Medical Center, Ruhr University Bochum, Minden, Germany; Department of Neurology (E.D.), University of Thessaly, Larissa, Greece; Stroke Unit (A.R.-C., E.C.-G.), Department of Neurology, Group of Research on Neurovascular Diseases, Hospital Del Mar Medical Research Institute. DCEX, Universitat Pompeu Fabra, Universitat Autonoma de Barcelona, Spain; Department of Neurosciences (Neurology) (D.A.d.S.), Hospital de Santa Maria, University of Lisbon, Portugal; Division of Neurology (M.S., A.H.K.), McMaster University and Population Health Research Institute, Hamilton; Sunnybrook Research Institute and Hurvitz Brain Sciences Program (D.J.G.), Sunnybrook Health Sciences Centre, and Department of Medicine, University of Toronto, Canada; Fondazione Policlinico Gemelli IRCCS (T.S.); Catholic University of the Sacred Heart (T.S.), Institute of Cardiology, Rome, Italy; Clinic and Policlinic for Cardiology (R.W.), University Hospital Leipzig, Germany; and Department of Neurology (S.Y.), New York University School of Medicine, NY
| | - Peter D Schellinger
- From the Second Department of Neurology (G.T., S.T., L.P., A.H.K.) and Second Department of Cardiology (S.D.), School of Medicine, "Attikon" Hospital, First Department of Cardiology (P.D., K.T.), School of Medicine, Hippokration Hospital, and Hygiene, Epidemiology and Medical Statistics, Medical School (G.M.), National and Kapodistrian University of Athens, Greece; Department of Neurology (G.T., A.V.A.), University of Tennessee Health Science Center, Memphis; Duke University School of Medicine (B.M.G.), Durham, NC; Department of Neurology (M.K.), Universitätsklinikum Essen, Germany; Department of Neurology (B.R., S.C., K.L.F.), Alpert Medical School, Brown University, Providence, RI; Department of Neurology (C.K.), St. Josef-Hospital, Ruhr University, Bochum; Departments of Neurology and Neurogeriatry (P.D.S.), Johannes Wesling Medical Center, Ruhr University Bochum, Minden, Germany; Department of Neurology (E.D.), University of Thessaly, Larissa, Greece; Stroke Unit (A.R.-C., E.C.-G.), Department of Neurology, Group of Research on Neurovascular Diseases, Hospital Del Mar Medical Research Institute. DCEX, Universitat Pompeu Fabra, Universitat Autonoma de Barcelona, Spain; Department of Neurosciences (Neurology) (D.A.d.S.), Hospital de Santa Maria, University of Lisbon, Portugal; Division of Neurology (M.S., A.H.K.), McMaster University and Population Health Research Institute, Hamilton; Sunnybrook Research Institute and Hurvitz Brain Sciences Program (D.J.G.), Sunnybrook Health Sciences Centre, and Department of Medicine, University of Toronto, Canada; Fondazione Policlinico Gemelli IRCCS (T.S.); Catholic University of the Sacred Heart (T.S.), Institute of Cardiology, Rome, Italy; Clinic and Policlinic for Cardiology (R.W.), University Hospital Leipzig, Germany; and Department of Neurology (S.Y.), New York University School of Medicine, NY
| | - Efthymios Dardiotis
- From the Second Department of Neurology (G.T., S.T., L.P., A.H.K.) and Second Department of Cardiology (S.D.), School of Medicine, "Attikon" Hospital, First Department of Cardiology (P.D., K.T.), School of Medicine, Hippokration Hospital, and Hygiene, Epidemiology and Medical Statistics, Medical School (G.M.), National and Kapodistrian University of Athens, Greece; Department of Neurology (G.T., A.V.A.), University of Tennessee Health Science Center, Memphis; Duke University School of Medicine (B.M.G.), Durham, NC; Department of Neurology (M.K.), Universitätsklinikum Essen, Germany; Department of Neurology (B.R., S.C., K.L.F.), Alpert Medical School, Brown University, Providence, RI; Department of Neurology (C.K.), St. Josef-Hospital, Ruhr University, Bochum; Departments of Neurology and Neurogeriatry (P.D.S.), Johannes Wesling Medical Center, Ruhr University Bochum, Minden, Germany; Department of Neurology (E.D.), University of Thessaly, Larissa, Greece; Stroke Unit (A.R.-C., E.C.-G.), Department of Neurology, Group of Research on Neurovascular Diseases, Hospital Del Mar Medical Research Institute. DCEX, Universitat Pompeu Fabra, Universitat Autonoma de Barcelona, Spain; Department of Neurosciences (Neurology) (D.A.d.S.), Hospital de Santa Maria, University of Lisbon, Portugal; Division of Neurology (M.S., A.H.K.), McMaster University and Population Health Research Institute, Hamilton; Sunnybrook Research Institute and Hurvitz Brain Sciences Program (D.J.G.), Sunnybrook Health Sciences Centre, and Department of Medicine, University of Toronto, Canada; Fondazione Policlinico Gemelli IRCCS (T.S.); Catholic University of the Sacred Heart (T.S.), Institute of Cardiology, Rome, Italy; Clinic and Policlinic for Cardiology (R.W.), University Hospital Leipzig, Germany; and Department of Neurology (S.Y.), New York University School of Medicine, NY
| | - Ana Rodriguez-Campello
- From the Second Department of Neurology (G.T., S.T., L.P., A.H.K.) and Second Department of Cardiology (S.D.), School of Medicine, "Attikon" Hospital, First Department of Cardiology (P.D., K.T.), School of Medicine, Hippokration Hospital, and Hygiene, Epidemiology and Medical Statistics, Medical School (G.M.), National and Kapodistrian University of Athens, Greece; Department of Neurology (G.T., A.V.A.), University of Tennessee Health Science Center, Memphis; Duke University School of Medicine (B.M.G.), Durham, NC; Department of Neurology (M.K.), Universitätsklinikum Essen, Germany; Department of Neurology (B.R., S.C., K.L.F.), Alpert Medical School, Brown University, Providence, RI; Department of Neurology (C.K.), St. Josef-Hospital, Ruhr University, Bochum; Departments of Neurology and Neurogeriatry (P.D.S.), Johannes Wesling Medical Center, Ruhr University Bochum, Minden, Germany; Department of Neurology (E.D.), University of Thessaly, Larissa, Greece; Stroke Unit (A.R.-C., E.C.-G.), Department of Neurology, Group of Research on Neurovascular Diseases, Hospital Del Mar Medical Research Institute. DCEX, Universitat Pompeu Fabra, Universitat Autonoma de Barcelona, Spain; Department of Neurosciences (Neurology) (D.A.d.S.), Hospital de Santa Maria, University of Lisbon, Portugal; Division of Neurology (M.S., A.H.K.), McMaster University and Population Health Research Institute, Hamilton; Sunnybrook Research Institute and Hurvitz Brain Sciences Program (D.J.G.), Sunnybrook Health Sciences Centre, and Department of Medicine, University of Toronto, Canada; Fondazione Policlinico Gemelli IRCCS (T.S.); Catholic University of the Sacred Heart (T.S.), Institute of Cardiology, Rome, Italy; Clinic and Policlinic for Cardiology (R.W.), University Hospital Leipzig, Germany; and Department of Neurology (S.Y.), New York University School of Medicine, NY
| | - Elisa Cuadrado-Godia
- From the Second Department of Neurology (G.T., S.T., L.P., A.H.K.) and Second Department of Cardiology (S.D.), School of Medicine, "Attikon" Hospital, First Department of Cardiology (P.D., K.T.), School of Medicine, Hippokration Hospital, and Hygiene, Epidemiology and Medical Statistics, Medical School (G.M.), National and Kapodistrian University of Athens, Greece; Department of Neurology (G.T., A.V.A.), University of Tennessee Health Science Center, Memphis; Duke University School of Medicine (B.M.G.), Durham, NC; Department of Neurology (M.K.), Universitätsklinikum Essen, Germany; Department of Neurology (B.R., S.C., K.L.F.), Alpert Medical School, Brown University, Providence, RI; Department of Neurology (C.K.), St. Josef-Hospital, Ruhr University, Bochum; Departments of Neurology and Neurogeriatry (P.D.S.), Johannes Wesling Medical Center, Ruhr University Bochum, Minden, Germany; Department of Neurology (E.D.), University of Thessaly, Larissa, Greece; Stroke Unit (A.R.-C., E.C.-G.), Department of Neurology, Group of Research on Neurovascular Diseases, Hospital Del Mar Medical Research Institute. DCEX, Universitat Pompeu Fabra, Universitat Autonoma de Barcelona, Spain; Department of Neurosciences (Neurology) (D.A.d.S.), Hospital de Santa Maria, University of Lisbon, Portugal; Division of Neurology (M.S., A.H.K.), McMaster University and Population Health Research Institute, Hamilton; Sunnybrook Research Institute and Hurvitz Brain Sciences Program (D.J.G.), Sunnybrook Health Sciences Centre, and Department of Medicine, University of Toronto, Canada; Fondazione Policlinico Gemelli IRCCS (T.S.); Catholic University of the Sacred Heart (T.S.), Institute of Cardiology, Rome, Italy; Clinic and Policlinic for Cardiology (R.W.), University Hospital Leipzig, Germany; and Department of Neurology (S.Y.), New York University School of Medicine, NY
| | - Diana Aguiar de Sousa
- From the Second Department of Neurology (G.T., S.T., L.P., A.H.K.) and Second Department of Cardiology (S.D.), School of Medicine, "Attikon" Hospital, First Department of Cardiology (P.D., K.T.), School of Medicine, Hippokration Hospital, and Hygiene, Epidemiology and Medical Statistics, Medical School (G.M.), National and Kapodistrian University of Athens, Greece; Department of Neurology (G.T., A.V.A.), University of Tennessee Health Science Center, Memphis; Duke University School of Medicine (B.M.G.), Durham, NC; Department of Neurology (M.K.), Universitätsklinikum Essen, Germany; Department of Neurology (B.R., S.C., K.L.F.), Alpert Medical School, Brown University, Providence, RI; Department of Neurology (C.K.), St. Josef-Hospital, Ruhr University, Bochum; Departments of Neurology and Neurogeriatry (P.D.S.), Johannes Wesling Medical Center, Ruhr University Bochum, Minden, Germany; Department of Neurology (E.D.), University of Thessaly, Larissa, Greece; Stroke Unit (A.R.-C., E.C.-G.), Department of Neurology, Group of Research on Neurovascular Diseases, Hospital Del Mar Medical Research Institute. DCEX, Universitat Pompeu Fabra, Universitat Autonoma de Barcelona, Spain; Department of Neurosciences (Neurology) (D.A.d.S.), Hospital de Santa Maria, University of Lisbon, Portugal; Division of Neurology (M.S., A.H.K.), McMaster University and Population Health Research Institute, Hamilton; Sunnybrook Research Institute and Hurvitz Brain Sciences Program (D.J.G.), Sunnybrook Health Sciences Centre, and Department of Medicine, University of Toronto, Canada; Fondazione Policlinico Gemelli IRCCS (T.S.); Catholic University of the Sacred Heart (T.S.), Institute of Cardiology, Rome, Italy; Clinic and Policlinic for Cardiology (R.W.), University Hospital Leipzig, Germany; and Department of Neurology (S.Y.), New York University School of Medicine, NY
| | - Mukul Sharma
- From the Second Department of Neurology (G.T., S.T., L.P., A.H.K.) and Second Department of Cardiology (S.D.), School of Medicine, "Attikon" Hospital, First Department of Cardiology (P.D., K.T.), School of Medicine, Hippokration Hospital, and Hygiene, Epidemiology and Medical Statistics, Medical School (G.M.), National and Kapodistrian University of Athens, Greece; Department of Neurology (G.T., A.V.A.), University of Tennessee Health Science Center, Memphis; Duke University School of Medicine (B.M.G.), Durham, NC; Department of Neurology (M.K.), Universitätsklinikum Essen, Germany; Department of Neurology (B.R., S.C., K.L.F.), Alpert Medical School, Brown University, Providence, RI; Department of Neurology (C.K.), St. Josef-Hospital, Ruhr University, Bochum; Departments of Neurology and Neurogeriatry (P.D.S.), Johannes Wesling Medical Center, Ruhr University Bochum, Minden, Germany; Department of Neurology (E.D.), University of Thessaly, Larissa, Greece; Stroke Unit (A.R.-C., E.C.-G.), Department of Neurology, Group of Research on Neurovascular Diseases, Hospital Del Mar Medical Research Institute. DCEX, Universitat Pompeu Fabra, Universitat Autonoma de Barcelona, Spain; Department of Neurosciences (Neurology) (D.A.d.S.), Hospital de Santa Maria, University of Lisbon, Portugal; Division of Neurology (M.S., A.H.K.), McMaster University and Population Health Research Institute, Hamilton; Sunnybrook Research Institute and Hurvitz Brain Sciences Program (D.J.G.), Sunnybrook Health Sciences Centre, and Department of Medicine, University of Toronto, Canada; Fondazione Policlinico Gemelli IRCCS (T.S.); Catholic University of the Sacred Heart (T.S.), Institute of Cardiology, Rome, Italy; Clinic and Policlinic for Cardiology (R.W.), University Hospital Leipzig, Germany; and Department of Neurology (S.Y.), New York University School of Medicine, NY
| | - David J Gladstone
- From the Second Department of Neurology (G.T., S.T., L.P., A.H.K.) and Second Department of Cardiology (S.D.), School of Medicine, "Attikon" Hospital, First Department of Cardiology (P.D., K.T.), School of Medicine, Hippokration Hospital, and Hygiene, Epidemiology and Medical Statistics, Medical School (G.M.), National and Kapodistrian University of Athens, Greece; Department of Neurology (G.T., A.V.A.), University of Tennessee Health Science Center, Memphis; Duke University School of Medicine (B.M.G.), Durham, NC; Department of Neurology (M.K.), Universitätsklinikum Essen, Germany; Department of Neurology (B.R., S.C., K.L.F.), Alpert Medical School, Brown University, Providence, RI; Department of Neurology (C.K.), St. Josef-Hospital, Ruhr University, Bochum; Departments of Neurology and Neurogeriatry (P.D.S.), Johannes Wesling Medical Center, Ruhr University Bochum, Minden, Germany; Department of Neurology (E.D.), University of Thessaly, Larissa, Greece; Stroke Unit (A.R.-C., E.C.-G.), Department of Neurology, Group of Research on Neurovascular Diseases, Hospital Del Mar Medical Research Institute. DCEX, Universitat Pompeu Fabra, Universitat Autonoma de Barcelona, Spain; Department of Neurosciences (Neurology) (D.A.d.S.), Hospital de Santa Maria, University of Lisbon, Portugal; Division of Neurology (M.S., A.H.K.), McMaster University and Population Health Research Institute, Hamilton; Sunnybrook Research Institute and Hurvitz Brain Sciences Program (D.J.G.), Sunnybrook Health Sciences Centre, and Department of Medicine, University of Toronto, Canada; Fondazione Policlinico Gemelli IRCCS (T.S.); Catholic University of the Sacred Heart (T.S.), Institute of Cardiology, Rome, Italy; Clinic and Policlinic for Cardiology (R.W.), University Hospital Leipzig, Germany; and Department of Neurology (S.Y.), New York University School of Medicine, NY
| | - Tommaso Sanna
- From the Second Department of Neurology (G.T., S.T., L.P., A.H.K.) and Second Department of Cardiology (S.D.), School of Medicine, "Attikon" Hospital, First Department of Cardiology (P.D., K.T.), School of Medicine, Hippokration Hospital, and Hygiene, Epidemiology and Medical Statistics, Medical School (G.M.), National and Kapodistrian University of Athens, Greece; Department of Neurology (G.T., A.V.A.), University of Tennessee Health Science Center, Memphis; Duke University School of Medicine (B.M.G.), Durham, NC; Department of Neurology (M.K.), Universitätsklinikum Essen, Germany; Department of Neurology (B.R., S.C., K.L.F.), Alpert Medical School, Brown University, Providence, RI; Department of Neurology (C.K.), St. Josef-Hospital, Ruhr University, Bochum; Departments of Neurology and Neurogeriatry (P.D.S.), Johannes Wesling Medical Center, Ruhr University Bochum, Minden, Germany; Department of Neurology (E.D.), University of Thessaly, Larissa, Greece; Stroke Unit (A.R.-C., E.C.-G.), Department of Neurology, Group of Research on Neurovascular Diseases, Hospital Del Mar Medical Research Institute. DCEX, Universitat Pompeu Fabra, Universitat Autonoma de Barcelona, Spain; Department of Neurosciences (Neurology) (D.A.d.S.), Hospital de Santa Maria, University of Lisbon, Portugal; Division of Neurology (M.S., A.H.K.), McMaster University and Population Health Research Institute, Hamilton; Sunnybrook Research Institute and Hurvitz Brain Sciences Program (D.J.G.), Sunnybrook Health Sciences Centre, and Department of Medicine, University of Toronto, Canada; Fondazione Policlinico Gemelli IRCCS (T.S.); Catholic University of the Sacred Heart (T.S.), Institute of Cardiology, Rome, Italy; Clinic and Policlinic for Cardiology (R.W.), University Hospital Leipzig, Germany; and Department of Neurology (S.Y.), New York University School of Medicine, NY
| | - Rolf Wachter
- From the Second Department of Neurology (G.T., S.T., L.P., A.H.K.) and Second Department of Cardiology (S.D.), School of Medicine, "Attikon" Hospital, First Department of Cardiology (P.D., K.T.), School of Medicine, Hippokration Hospital, and Hygiene, Epidemiology and Medical Statistics, Medical School (G.M.), National and Kapodistrian University of Athens, Greece; Department of Neurology (G.T., A.V.A.), University of Tennessee Health Science Center, Memphis; Duke University School of Medicine (B.M.G.), Durham, NC; Department of Neurology (M.K.), Universitätsklinikum Essen, Germany; Department of Neurology (B.R., S.C., K.L.F.), Alpert Medical School, Brown University, Providence, RI; Department of Neurology (C.K.), St. Josef-Hospital, Ruhr University, Bochum; Departments of Neurology and Neurogeriatry (P.D.S.), Johannes Wesling Medical Center, Ruhr University Bochum, Minden, Germany; Department of Neurology (E.D.), University of Thessaly, Larissa, Greece; Stroke Unit (A.R.-C., E.C.-G.), Department of Neurology, Group of Research on Neurovascular Diseases, Hospital Del Mar Medical Research Institute. DCEX, Universitat Pompeu Fabra, Universitat Autonoma de Barcelona, Spain; Department of Neurosciences (Neurology) (D.A.d.S.), Hospital de Santa Maria, University of Lisbon, Portugal; Division of Neurology (M.S., A.H.K.), McMaster University and Population Health Research Institute, Hamilton; Sunnybrook Research Institute and Hurvitz Brain Sciences Program (D.J.G.), Sunnybrook Health Sciences Centre, and Department of Medicine, University of Toronto, Canada; Fondazione Policlinico Gemelli IRCCS (T.S.); Catholic University of the Sacred Heart (T.S.), Institute of Cardiology, Rome, Italy; Clinic and Policlinic for Cardiology (R.W.), University Hospital Leipzig, Germany; and Department of Neurology (S.Y.), New York University School of Medicine, NY
| | - Karen L Furie
- From the Second Department of Neurology (G.T., S.T., L.P., A.H.K.) and Second Department of Cardiology (S.D.), School of Medicine, "Attikon" Hospital, First Department of Cardiology (P.D., K.T.), School of Medicine, Hippokration Hospital, and Hygiene, Epidemiology and Medical Statistics, Medical School (G.M.), National and Kapodistrian University of Athens, Greece; Department of Neurology (G.T., A.V.A.), University of Tennessee Health Science Center, Memphis; Duke University School of Medicine (B.M.G.), Durham, NC; Department of Neurology (M.K.), Universitätsklinikum Essen, Germany; Department of Neurology (B.R., S.C., K.L.F.), Alpert Medical School, Brown University, Providence, RI; Department of Neurology (C.K.), St. Josef-Hospital, Ruhr University, Bochum; Departments of Neurology and Neurogeriatry (P.D.S.), Johannes Wesling Medical Center, Ruhr University Bochum, Minden, Germany; Department of Neurology (E.D.), University of Thessaly, Larissa, Greece; Stroke Unit (A.R.-C., E.C.-G.), Department of Neurology, Group of Research on Neurovascular Diseases, Hospital Del Mar Medical Research Institute. DCEX, Universitat Pompeu Fabra, Universitat Autonoma de Barcelona, Spain; Department of Neurosciences (Neurology) (D.A.d.S.), Hospital de Santa Maria, University of Lisbon, Portugal; Division of Neurology (M.S., A.H.K.), McMaster University and Population Health Research Institute, Hamilton; Sunnybrook Research Institute and Hurvitz Brain Sciences Program (D.J.G.), Sunnybrook Health Sciences Centre, and Department of Medicine, University of Toronto, Canada; Fondazione Policlinico Gemelli IRCCS (T.S.); Catholic University of the Sacred Heart (T.S.), Institute of Cardiology, Rome, Italy; Clinic and Policlinic for Cardiology (R.W.), University Hospital Leipzig, Germany; and Department of Neurology (S.Y.), New York University School of Medicine, NY
| | - Andrei V Alexandrov
- From the Second Department of Neurology (G.T., S.T., L.P., A.H.K.) and Second Department of Cardiology (S.D.), School of Medicine, "Attikon" Hospital, First Department of Cardiology (P.D., K.T.), School of Medicine, Hippokration Hospital, and Hygiene, Epidemiology and Medical Statistics, Medical School (G.M.), National and Kapodistrian University of Athens, Greece; Department of Neurology (G.T., A.V.A.), University of Tennessee Health Science Center, Memphis; Duke University School of Medicine (B.M.G.), Durham, NC; Department of Neurology (M.K.), Universitätsklinikum Essen, Germany; Department of Neurology (B.R., S.C., K.L.F.), Alpert Medical School, Brown University, Providence, RI; Department of Neurology (C.K.), St. Josef-Hospital, Ruhr University, Bochum; Departments of Neurology and Neurogeriatry (P.D.S.), Johannes Wesling Medical Center, Ruhr University Bochum, Minden, Germany; Department of Neurology (E.D.), University of Thessaly, Larissa, Greece; Stroke Unit (A.R.-C., E.C.-G.), Department of Neurology, Group of Research on Neurovascular Diseases, Hospital Del Mar Medical Research Institute. DCEX, Universitat Pompeu Fabra, Universitat Autonoma de Barcelona, Spain; Department of Neurosciences (Neurology) (D.A.d.S.), Hospital de Santa Maria, University of Lisbon, Portugal; Division of Neurology (M.S., A.H.K.), McMaster University and Population Health Research Institute, Hamilton; Sunnybrook Research Institute and Hurvitz Brain Sciences Program (D.J.G.), Sunnybrook Health Sciences Centre, and Department of Medicine, University of Toronto, Canada; Fondazione Policlinico Gemelli IRCCS (T.S.); Catholic University of the Sacred Heart (T.S.), Institute of Cardiology, Rome, Italy; Clinic and Policlinic for Cardiology (R.W.), University Hospital Leipzig, Germany; and Department of Neurology (S.Y.), New York University School of Medicine, NY
| | - Shadi Yaghi
- From the Second Department of Neurology (G.T., S.T., L.P., A.H.K.) and Second Department of Cardiology (S.D.), School of Medicine, "Attikon" Hospital, First Department of Cardiology (P.D., K.T.), School of Medicine, Hippokration Hospital, and Hygiene, Epidemiology and Medical Statistics, Medical School (G.M.), National and Kapodistrian University of Athens, Greece; Department of Neurology (G.T., A.V.A.), University of Tennessee Health Science Center, Memphis; Duke University School of Medicine (B.M.G.), Durham, NC; Department of Neurology (M.K.), Universitätsklinikum Essen, Germany; Department of Neurology (B.R., S.C., K.L.F.), Alpert Medical School, Brown University, Providence, RI; Department of Neurology (C.K.), St. Josef-Hospital, Ruhr University, Bochum; Departments of Neurology and Neurogeriatry (P.D.S.), Johannes Wesling Medical Center, Ruhr University Bochum, Minden, Germany; Department of Neurology (E.D.), University of Thessaly, Larissa, Greece; Stroke Unit (A.R.-C., E.C.-G.), Department of Neurology, Group of Research on Neurovascular Diseases, Hospital Del Mar Medical Research Institute. DCEX, Universitat Pompeu Fabra, Universitat Autonoma de Barcelona, Spain; Department of Neurosciences (Neurology) (D.A.d.S.), Hospital de Santa Maria, University of Lisbon, Portugal; Division of Neurology (M.S., A.H.K.), McMaster University and Population Health Research Institute, Hamilton; Sunnybrook Research Institute and Hurvitz Brain Sciences Program (D.J.G.), Sunnybrook Health Sciences Centre, and Department of Medicine, University of Toronto, Canada; Fondazione Policlinico Gemelli IRCCS (T.S.); Catholic University of the Sacred Heart (T.S.), Institute of Cardiology, Rome, Italy; Clinic and Policlinic for Cardiology (R.W.), University Hospital Leipzig, Germany; and Department of Neurology (S.Y.), New York University School of Medicine, NY
| | - Aristeidis H Katsanos
- From the Second Department of Neurology (G.T., S.T., L.P., A.H.K.) and Second Department of Cardiology (S.D.), School of Medicine, "Attikon" Hospital, First Department of Cardiology (P.D., K.T.), School of Medicine, Hippokration Hospital, and Hygiene, Epidemiology and Medical Statistics, Medical School (G.M.), National and Kapodistrian University of Athens, Greece; Department of Neurology (G.T., A.V.A.), University of Tennessee Health Science Center, Memphis; Duke University School of Medicine (B.M.G.), Durham, NC; Department of Neurology (M.K.), Universitätsklinikum Essen, Germany; Department of Neurology (B.R., S.C., K.L.F.), Alpert Medical School, Brown University, Providence, RI; Department of Neurology (C.K.), St. Josef-Hospital, Ruhr University, Bochum; Departments of Neurology and Neurogeriatry (P.D.S.), Johannes Wesling Medical Center, Ruhr University Bochum, Minden, Germany; Department of Neurology (E.D.), University of Thessaly, Larissa, Greece; Stroke Unit (A.R.-C., E.C.-G.), Department of Neurology, Group of Research on Neurovascular Diseases, Hospital Del Mar Medical Research Institute. DCEX, Universitat Pompeu Fabra, Universitat Autonoma de Barcelona, Spain; Department of Neurosciences (Neurology) (D.A.d.S.), Hospital de Santa Maria, University of Lisbon, Portugal; Division of Neurology (M.S., A.H.K.), McMaster University and Population Health Research Institute, Hamilton; Sunnybrook Research Institute and Hurvitz Brain Sciences Program (D.J.G.), Sunnybrook Health Sciences Centre, and Department of Medicine, University of Toronto, Canada; Fondazione Policlinico Gemelli IRCCS (T.S.); Catholic University of the Sacred Heart (T.S.), Institute of Cardiology, Rome, Italy; Clinic and Policlinic for Cardiology (R.W.), University Hospital Leipzig, Germany; and Department of Neurology (S.Y.), New York University School of Medicine, NY
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Ashraf MR, Rahman M, Cao X, Duval K, Williams BB, Hoopes PJ, Gladstone DJ, Pogue BW, Zhang R, Bruza P. Individual pulse monitoring and dose control system for pre-clinical implementation of FLASH-RT. Phys Med Biol 2022; 67:10.1088/1361-6560/ac5f6f. [PMID: 35313290 PMCID: PMC10305796 DOI: 10.1088/1361-6560/ac5f6f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2021] [Accepted: 03/21/2022] [Indexed: 11/11/2022]
Abstract
Objective.Existing ultra-high dose rate (UHDR) electron sources lack dose rate independent dosimeters and a calibrated dose control system for accurate delivery. In this study, we aim to develop a custom single-pulse dose monitoring and a real-time dose-based control system for a FLASH enabled clinical linear accelerator (Linac).Approach.A commercially available point scintillator detector was coupled to a gated integrating amplifier and a real-time controller for dose monitoring and feedback control loop. The controller was programmed to integrate dose for each radiation pulse and stop the radiation beam when the prescribed dose was delivered. Additionally, the scintillator was mounted in a solid water phantom and placed underneath mice skin forin vivodose monitoring. The scintillator was characterized in terms of its radiation stability, mean dose-rate (Ḋm), and dose per pulse (Dp) dependence.Main results.TheDpexhibited a consistent ramp-up period across ∼4-5 pulse. The plastic scintillator was shown to be linear withḊm(40-380 Gy s-1) andDp(0.3-1.3 Gy Pulse-1) to within +/- 3%. However, the plastic scintillator was subject to significant radiation damage (16%/kGy) for the initial 1 kGy and would need to be calibrated frequently. Pulse-counting control was accurately implemented with one-to-one correspondence between the intended and the actual delivered pulses. The dose-based control was sufficient to gate on any pulse of the Linac.In vivodosimetry monitoring with a 1 cm circular cut-out revealed that during the ramp-up period, the averageDpwas ∼0.045 ± 0.004 Gy Pulse-1, whereas after the ramp-up it stabilized at 0.65 ± 0.01 Gy Pulse-1.Significance.The tools presented in this study can be used to determine the beam parameter space pertinent to the FLASH effect. Additionally, this study is the first instance of real-time dose-based control for a modified Linac at ultra-high dose rates, which provides insight into the tool required for future clinical translation of FLASH-RT.
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Affiliation(s)
- M. Ramish Ashraf
- Thayer School of Engineering, Dartmouth College, Hanover NH 03755, US
| | - Mahbubur Rahman
- Thayer School of Engineering, Dartmouth College, Hanover NH 03755, US
| | - Xu Cao
- Thayer School of Engineering, Dartmouth College, Hanover NH 03755, US
| | - Kayla Duval
- Department of Medicine, Geisel School of Medicine, Dartmouth College Hanover NH 03755 USA
| | - Benjamin B. Williams
- Thayer School of Engineering, Dartmouth College, Hanover NH 03755, US
- Department of Medicine, Geisel School of Medicine, Dartmouth College Hanover NH 03755 USA
- Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, NH 03756 USA
| | - P. Jack Hoopes
- Thayer School of Engineering, Dartmouth College, Hanover NH 03755, US
- Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, NH 03756 USA
- Department of Surgery, Geisel School of Medicine, Dartmouth College, Hanover NH 03755 USA
| | - David J. Gladstone
- Thayer School of Engineering, Dartmouth College, Hanover NH 03755, US
- Department of Medicine, Geisel School of Medicine, Dartmouth College Hanover NH 03755 USA
- Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, NH 03756 USA
| | - Brian W. Pogue
- Thayer School of Engineering, Dartmouth College, Hanover NH 03755, US
- Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, NH 03756 USA
- Department of Surgery, Geisel School of Medicine, Dartmouth College, Hanover NH 03755 USA
| | - Rongxiao Zhang
- Thayer School of Engineering, Dartmouth College, Hanover NH 03755, US
- Department of Medicine, Geisel School of Medicine, Dartmouth College Hanover NH 03755 USA
- Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, NH 03756 USA
| | - Petr Bruza
- Thayer School of Engineering, Dartmouth College, Hanover NH 03755, US
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Hachadorian RL, Bruza P, Jermyn M, Gladstone DJ, Zhang R, Jarvis LA, Pogue BW. Remote dose imaging from cherenkov light using spatially-resolved CT calibration in breast radiotherapy. Med Phys 2022; 49:4018-4025. [PMID: 35304768 DOI: 10.1002/mp.15614] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2021] [Revised: 02/16/2022] [Accepted: 03/10/2022] [Indexed: 11/10/2022] Open
Abstract
PURPOSE Imaging Cherenkov light during radiotherapy allows the visualization and recording of frame-by-frame relative maps of the dose being delivered to the tissue at each control point used throughout treatment, providing one of the most complete real-time means of treatment quality assurance. In non-turbid media, the intensity of Cherenkov light is linear with surface dose deposited, however the emission from patient tissue is well-known to be reduced by absorbing tissue components such as hemoglobin, fat, water and melanin, and diffused by the scattering components of tissue. Earlier studies have shown that bulk correction could be achieved by using the patient planning CT scan for attenuation correction. METHODS In this study, CT maps were used for correction of spatial variations in emissivity. Testing was completed on Cherenkov images from radiotherapy treatments of post-lumpectomy breast cancer patients (n = 13), combined with spatial renderings of the patient radiodensity (CT number) from their planning CT scan. RESULTS The correction technique was shown to provide a pixel-by-pixel correction that suppressed many of the inter- and intra-patient differences in the Cherenkov light emitted per unit dose. This correction was established from a calibration curve that correlated Cherenkov light intensity to surface-rendered CT number (R6MV 2 = 0.70 and R10MV 2 = 0.72). The corrected Cherenkov intensity per unit dose standard error was reduced by nearly half (from ∼30% to ∼17%). CONCLUSIONS This approach provides evidence that the planning CT scan can mitigate some of the tissue-specific attenuation in Cherenkov images, allowing them to be translated into near surface dose images. This article is protected by copyright. All rights reserved.
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Affiliation(s)
| | - Petr Bruza
- Thayer School of Engineering at Dartmouth, Dartmouth College, Hanover, NH.,DoseOptics LLC, NH, Lebanon
| | - Michael Jermyn
- Thayer School of Engineering at Dartmouth, Dartmouth College, Hanover, NH.,DoseOptics LLC, NH, Lebanon
| | - David J Gladstone
- Thayer School of Engineering at Dartmouth, Dartmouth College, Hanover, NH.,Department of Medicine, Geisel School of Medicine, Dartmouth College, Hanover, NH
| | - Rongxiao Zhang
- Thayer School of Engineering at Dartmouth, Dartmouth College, Hanover, NH.,Department of Medicine, Geisel School of Medicine, Dartmouth College, Hanover, NH
| | - Lesley A Jarvis
- Department of Medicine, Geisel School of Medicine, Dartmouth College, Hanover, NH
| | - Brian W Pogue
- Thayer School of Engineering at Dartmouth, Dartmouth College, Hanover, NH.,DoseOptics LLC, NH, Lebanon
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Swartz HM, Hoopes PJ, Gladstone DJ, Demidov V, Vaupel P, Flood AB, Williams BB, Zhang R, Pogue BW. A Radiation Biological Analysis of the Oxygen Effect as a Possible Mechanism in FLASH. Adv Exp Med Biol 2022; 1395:315-321. [PMID: 36527655 PMCID: PMC10653672 DOI: 10.1007/978-3-031-14190-4_51] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The delivery of radiation at an ultra-high dose rate (FLASH) is an important new approach to radiotherapy (RT) that appears to be able to improve the therapeutic ratio by diminishing damage to normal tissues. While the mechanisms by which FLASH improves outcomes have not been established, a role involving molecular oxygen (O2) is frequently mentioned. In order to effectively determine if the protective effect of FLASH RT occurs via a differential direct depletion of O2 (compared to conventional radiation), it is essential to consider the known role of O2 in modifying the response of cells and tissues to ionising radiation (known as 'the oxygen effect'). Considerations include: (1) The pertinent reaction involves an unstable intermediate of radiation-damaged DNA, which either undergoes chemical repair to restore the DNA or reacts with O2, resulting in an unrepairable lesion in the DNA, (2) These reactions occur in the nuclear DNA, which can be used to estimate the distance needed for O2 to diffuse through the cell to reach the intermediates, (3) The longest lifetime that the reactive site of the DNA is available to react with O2 is 1-10 μsec, (4) Using these lifetime estimates and known diffusion rates in different cell media, the maximal distance that O2 could travel in the cytosol to reach the site of the DNA (i.e., the nucleus) in time to react are 60-185 nm. This calculation defines the volume of oxygen that is pertinent for the direct oxygen effect, (5) Therefore, direct measurements of oxygen to determine if FLASH RT operates through differential radiochemical depletion of oxygen will require the ability to measure oxygen selectively in a sphere of <200 nm, with a time resolution of the duration of the delivery of FLASH, (6) It also is possible that alterations of oxygen levels by FLASH could occur more indirectly by affecting oxygen-dependent cell signalling and/or cellular repair.
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Affiliation(s)
- Harold M Swartz
- Geisel School of Medicine, Dartmouth College, Hanover, NH, USA.
- Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Centre, Lebanon, NH, USA.
- Thayer School of Engineering, Dartmouth College, Hanover, NH, USA.
| | - P Jack Hoopes
- Geisel School of Medicine, Dartmouth College, Hanover, NH, USA
- Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Centre, Lebanon, NH, USA
- Thayer School of Engineering, Dartmouth College, Hanover, NH, USA
| | - David J Gladstone
- Geisel School of Medicine, Dartmouth College, Hanover, NH, USA
- Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Centre, Lebanon, NH, USA
- Thayer School of Engineering, Dartmouth College, Hanover, NH, USA
| | | | - Peter Vaupel
- Department of Radiation Oncology, University Medical Center, Freiburg, Germany
| | - Ann Barry Flood
- Geisel School of Medicine, Dartmouth College, Hanover, NH, USA
- Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Centre, Lebanon, NH, USA
| | - Benjamin B Williams
- Geisel School of Medicine, Dartmouth College, Hanover, NH, USA
- Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Centre, Lebanon, NH, USA
- Thayer School of Engineering, Dartmouth College, Hanover, NH, USA
| | - Rongxiao Zhang
- Geisel School of Medicine, Dartmouth College, Hanover, NH, USA
- Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Centre, Lebanon, NH, USA
- Thayer School of Engineering, Dartmouth College, Hanover, NH, USA
| | - Brian W Pogue
- Geisel School of Medicine, Dartmouth College, Hanover, NH, USA
- Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Centre, Lebanon, NH, USA
- Thayer School of Engineering, Dartmouth College, Hanover, NH, USA
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Rahman M, Ashraf MR, Gladstone DJ, Bruza P, Jarvis LA, Schaner PE, Cao X, Pogue BW, Hoopes PJ, Zhang R. Treatment Planning System for Electron FLASH Radiotherapy: Open-source for Clinical Implementation. Int J Radiat Oncol Biol Phys 2021; 112:1023-1032. [PMID: 34762969 PMCID: PMC10386889 DOI: 10.1016/j.ijrobp.2021.10.148] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2021] [Revised: 08/31/2021] [Accepted: 10/22/2021] [Indexed: 10/19/2022]
Abstract
PURPOSE A Monte Carlo (MC) beam model and its implementation in a clinical treatment planning system (TPS, Varian Eclipse) are presented for a modified ultra-high dose-rate electron FLASH radiotherapy LINAC (eFLASH-RT) utilizing clinical accessories and geometry. METHODS The gantry head without scattering foils or targets, representative of the LINAC modifications, was modelled in Geant4-based GAMOS MC toolkit. The energy spectrum (σE) and beam source emittance cone angle (θcone) were varied to match the calculated open field central-axis percent depth dose (PDD) and lateral profiles with Gafchromic film measurements. The beam model and its Eclipse configuration were validated with measured profiles of the open field and nominal fields for clinical applicators. A MC forward dose calculation was conducted for a mouse whole brain treatment and an eFLASH-RT plan was compared to a conventional (Conv-RT) electron plan in Eclipse for a human patient with metastatic renal cell carcinoma. RESULTS The eFLASH beam model agreed best with measurements at σE=0.5 MeV and θcone=3.9±0.2 degrees. The model and its Eclipse configuration were validated to clinically acceptable accuracy (the absolute average error was within 1.5% for in-water lateral, 3% for in-air lateral, and 2% for PDD's). The forward calculation showed adequate dose delivery to the entire mouse brain, while sparing the organ-at-risk (lung). The human patient case demonstrated the planning capability with routine accessories to achieve an acceptable plan (90% of the tumor volume receiving 95% and 90% of the prescribed dose for eFLASH and conventional, respectively). CONCLUSION To the best of our knowledge, this is the first functional beam model commissioned in a clinical TPS for eFLASH-RT, enabling planning and evaluation with minimal deviation from Conv-RT workflow. It facilitates the clinical translation as eFLASH-RT and Conv-RT plan quality were comparable for a human patient involving complex geometries and tissue heterogeneity. The methods can be expanded to model other eFLASH irradiators with different beam characteristics.
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Affiliation(s)
- Mahbubur Rahman
- Thayer School of Engineering, Dartmouth College, Hanover NH 03755, US.
| | - M Ramish Ashraf
- Thayer School of Engineering, Dartmouth College, Hanover NH 03755, US
| | - David J Gladstone
- Thayer School of Engineering, Dartmouth College, Hanover NH 03755, US; Department of Medicine, Radiation Oncology, Geisel School of Medicine, Dartmouth College Hanover NH 03755 USA; Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, NH 03756 USA
| | - Petr Bruza
- Thayer School of Engineering, Dartmouth College, Hanover NH 03755, US
| | - Lesley A Jarvis
- Department of Medicine, Radiation Oncology, Geisel School of Medicine, Dartmouth College Hanover NH 03755 USA; Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, NH 03756 USA
| | - Philip E Schaner
- Department of Medicine, Radiation Oncology, Geisel School of Medicine, Dartmouth College Hanover NH 03755 USA; Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, NH 03756 USA
| | - Xu Cao
- Thayer School of Engineering, Dartmouth College, Hanover NH 03755, US
| | - Brian W Pogue
- Thayer School of Engineering, Dartmouth College, Hanover NH 03755, US; Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, NH 03756 USA; Department of Surgery, Geisel School of Medicine, Dartmouth College, Hanover NH 03755 USA
| | - P Jack Hoopes
- Thayer School of Engineering, Dartmouth College, Hanover NH 03755, US; Department of Medicine, Radiation Oncology, Geisel School of Medicine, Dartmouth College Hanover NH 03755 USA; Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, NH 03756 USA; Department of Surgery, Geisel School of Medicine, Dartmouth College, Hanover NH 03755 USA
| | - Rongxiao Zhang
- Thayer School of Engineering, Dartmouth College, Hanover NH 03755, US; Department of Medicine, Radiation Oncology, Geisel School of Medicine, Dartmouth College Hanover NH 03755 USA; Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, NH 03756 USA
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Alexander DA, Nomezine A, Jarvis LA, Gladstone DJ, Pogue BW, Bruza P. Color Cherenkov imaging of clinical radiation therapy. Light Sci Appl 2021; 10:226. [PMID: 34737264 PMCID: PMC8569159 DOI: 10.1038/s41377-021-00660-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2021] [Revised: 10/01/2021] [Accepted: 10/08/2021] [Indexed: 05/08/2023]
Abstract
Color vision is used throughout medicine to interpret the health and status of tissue. Ionizing radiation used in radiation therapy produces broadband white light inside tissue through the Cherenkov effect, and this light is attenuated by tissue features as it leaves the body. In this study, a novel time-gated three-channel camera was developed for the first time and was used to image color Cherenkov emission coming from patients during treatment. The spectral content was interpreted by comparison with imaging calibrated tissue phantoms. Color shades of Cherenkov emission in radiotherapy can be used to interpret tissue blood volume, oxygen saturation and major vessels within the body.
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Affiliation(s)
- Daniel A Alexander
- Thayer School of Engineering, Dartmouth College, Hanover, NH, USA
- DoseOptics LLC, Lebanon, NH, USA
| | - Anthony Nomezine
- Thayer School of Engineering, Dartmouth College, Hanover, NH, USA
| | - Lesley A Jarvis
- Geisel School of Medicine, Dartmouth College, Hanover, NH, USA
- Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, NH, USA
| | - David J Gladstone
- Thayer School of Engineering, Dartmouth College, Hanover, NH, USA
- Geisel School of Medicine, Dartmouth College, Hanover, NH, USA
- Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, NH, USA
| | - Brian W Pogue
- Thayer School of Engineering, Dartmouth College, Hanover, NH, USA
- DoseOptics LLC, Lebanon, NH, USA
- Geisel School of Medicine, Dartmouth College, Hanover, NH, USA
- Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, NH, USA
| | - Petr Bruza
- Thayer School of Engineering, Dartmouth College, Hanover, NH, USA.
- DoseOptics LLC, Lebanon, NH, USA.
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Boulos MI, Kamra M, Colelli DR, Kirolos N, Gladstone DJ, Boyle K, Sundaram A, Hopyan JJ, Swartz RH, Mamdani M, Loong D, Isaranuwatchai W, Murray BJ, Thorpe KE. SLEAP SMART (Sleep Apnea Screening Using Mobile Ambulatory Recorders After TIA/Stroke): A Randomized Controlled Trial. Stroke 2021; 53:710-718. [PMID: 34628939 DOI: 10.1161/strokeaha.120.033753] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND AND PURPOSE Poststroke/transient ischemic attack obstructive sleep apnea (OSA) is prevalent, linked with numerous unfavorable health consequences, but remains underdiagnosed. Reasons include patient inconvenience and costs associated with use of in-laboratory polysomnography (iPSG), the current standard tool. Fortunately, home sleep apnea testing (HSAT) can accurately diagnose OSA and is potentially more convenient and cost-effective compared with iPSG. Our objective was to assess whether screening for OSA in patients with stroke/transient ischemic attack using HSAT, compared with standard of care using iPSG, increased diagnosis and treatment of OSA, improved clinical outcomes and patient experiences with sleep testing, and was a cost-effective approach. METHODS We consecutively recruited 250 patients who had sustained a stroke/transient ischemic attack within the past 6 months. Patients were randomized (1:1) to use of (1) HSAT versus (2) iPSG. Patients completed assessments and questionnaires at baseline and 6-month follow-up appointments. Patients diagnosed with OSA were offered continuous positive airway pressure. The primary outcome was compared between study arms via an intention-to-treat analysis. RESULTS At 6 months, 94 patients completed HSAT and 71 patients completed iPSG. A significantly greater proportion of patients in the HSAT arm were diagnosed with OSA (48.8% versus 35.2%, P=0.04) compared with the iPSG arm. Furthermore, patients assigned to HSAT, compared with iPSG, were more likely to be prescribed continuous positive airway pressure (40.0% versus 27.2%), report significantly reduced sleepiness, and a greater ability to perform daily activities. Moreover, a significantly greater proportion of patients reported a positive experience with sleep testing in the HSAT arm compared with the iPSG arm (89.4% versus 31.1%). Finally, a cost-effectiveness analysis revealed that HSAT was economically attractive for the detection of OSA compared with iPSG. CONCLUSIONS In patients with stroke/transient ischemic attack, use of HSAT compared with iPSG increases the rate of OSA diagnosis and treatment, reduces daytime sleepiness, improves functional outcomes and experiences with sleep testing, and could be an economically attractive approach. REGISTRATION URL: https://www.clinicaltrials.gov; Unique identifier: NCT02454023.
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Affiliation(s)
- Mark I Boulos
- Hurvitz Brain Sciences Research Program, Sunnybrook Research Institute, Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada (M.I.B., M.K., D.R.C., N.K., D.J.G., K.B., A.S., J.J.H., R.H.S., B.J.M.).,Department of Medicine, Division of Neurology, University of Toronto, Ontario, Canada. (M.I.B., D.J.G., K.B., A.S., J.J.H., R.H.S., B.J.M.).,Sleep Laboratory, Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada (M.I.B., B.J.M.)
| | - Maneesha Kamra
- Hurvitz Brain Sciences Research Program, Sunnybrook Research Institute, Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada (M.I.B., M.K., D.R.C., N.K., D.J.G., K.B., A.S., J.J.H., R.H.S., B.J.M.)
| | - David R Colelli
- Hurvitz Brain Sciences Research Program, Sunnybrook Research Institute, Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada (M.I.B., M.K., D.R.C., N.K., D.J.G., K.B., A.S., J.J.H., R.H.S., B.J.M.)
| | - Nardin Kirolos
- Hurvitz Brain Sciences Research Program, Sunnybrook Research Institute, Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada (M.I.B., M.K., D.R.C., N.K., D.J.G., K.B., A.S., J.J.H., R.H.S., B.J.M.)
| | - David J Gladstone
- Hurvitz Brain Sciences Research Program, Sunnybrook Research Institute, Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada (M.I.B., M.K., D.R.C., N.K., D.J.G., K.B., A.S., J.J.H., R.H.S., B.J.M.).,Department of Medicine, Division of Neurology, University of Toronto, Ontario, Canada. (M.I.B., D.J.G., K.B., A.S., J.J.H., R.H.S., B.J.M.)
| | - Karl Boyle
- Hurvitz Brain Sciences Research Program, Sunnybrook Research Institute, Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada (M.I.B., M.K., D.R.C., N.K., D.J.G., K.B., A.S., J.J.H., R.H.S., B.J.M.).,Department of Medicine, Division of Neurology, University of Toronto, Ontario, Canada. (M.I.B., D.J.G., K.B., A.S., J.J.H., R.H.S., B.J.M.).,Stroke Medicine, Beaumont Hospital, Dublin, Ireland (K.B.)
| | - Arun Sundaram
- Hurvitz Brain Sciences Research Program, Sunnybrook Research Institute, Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada (M.I.B., M.K., D.R.C., N.K., D.J.G., K.B., A.S., J.J.H., R.H.S., B.J.M.).,Department of Medicine, Division of Neurology, University of Toronto, Ontario, Canada. (M.I.B., D.J.G., K.B., A.S., J.J.H., R.H.S., B.J.M.)
| | - Julia J Hopyan
- Hurvitz Brain Sciences Research Program, Sunnybrook Research Institute, Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada (M.I.B., M.K., D.R.C., N.K., D.J.G., K.B., A.S., J.J.H., R.H.S., B.J.M.).,Department of Medicine, Division of Neurology, University of Toronto, Ontario, Canada. (M.I.B., D.J.G., K.B., A.S., J.J.H., R.H.S., B.J.M.)
| | - Richard H Swartz
- Hurvitz Brain Sciences Research Program, Sunnybrook Research Institute, Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada (M.I.B., M.K., D.R.C., N.K., D.J.G., K.B., A.S., J.J.H., R.H.S., B.J.M.).,Department of Medicine, Division of Neurology, University of Toronto, Ontario, Canada. (M.I.B., D.J.G., K.B., A.S., J.J.H., R.H.S., B.J.M.)
| | - Muhammad Mamdani
- Li Ka Shing Knowledge Institute, St. Michael's Hospital, Unity Health Toronto, Ontario, Canada (M.M., D.L., W.I)
| | - Desmond Loong
- Institute of Health Policy, Management and Evaluation, University of Toronto, Ontario, Canada. (D.L., W.I.).,Li Ka Shing Knowledge Institute, St. Michael's Hospital, Unity Health Toronto, Ontario, Canada (M.M., D.L., W.I)
| | - Wanrudee Isaranuwatchai
- Institute of Health Policy, Management and Evaluation, University of Toronto, Ontario, Canada. (D.L., W.I.).,Li Ka Shing Knowledge Institute, St. Michael's Hospital, Unity Health Toronto, Ontario, Canada (M.M., D.L., W.I)
| | - Brian J Murray
- Hurvitz Brain Sciences Research Program, Sunnybrook Research Institute, Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada (M.I.B., M.K., D.R.C., N.K., D.J.G., K.B., A.S., J.J.H., R.H.S., B.J.M.).,Department of Medicine, Division of Neurology, University of Toronto, Ontario, Canada. (M.I.B., D.J.G., K.B., A.S., J.J.H., R.H.S., B.J.M.).,Sleep Laboratory, Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada (M.I.B., B.J.M.)
| | - Kevin E Thorpe
- Applied Health Research Centre & Dalla Lana School of Public Health, University of Toronto, Ontario, Canada. (K.E.T.)
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Rahman M, Bruza P, Hachadorian R, Alexander D, Cao X, Zhang R, Gladstone DJ, Pogue BW. Optimization of in vivo Cherenkov imaging dosimetry via spectral choices for ambient background lights and filtering. J Biomed Opt 2021; 26:JBO-210195RR. [PMID: 34643072 PMCID: PMC8510878 DOI: 10.1117/1.jbo.26.10.106003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Accepted: 09/23/2021] [Indexed: 06/13/2023]
Abstract
SIGNIFICANCE The Cherenkov emission spectrum overlaps with that of ambient room light sources. Choice of room lighting devices dramatically affects the efficient detection of Cherenkov emission during patient treatment. AIM To determine optimal room light sources allowing Cherenkov emission imaging in normally lit radiotherapy treatment delivery rooms. APPROACH A variety of commercial light sources and long-pass (LP) filters were surveyed for spectral band separation from the red to near-infrared Cherenkov light emitted by tissue. Their effects on signal-to-noise ratio (SNR), Cherenkov to background signal ratio, and image artifacts were quantified by imaging irradiated tissue equivalent phantoms with an intensified time-gated CMOS camera. RESULTS Because Cherenkov emission from tissue lies largely in the near-infrared spectrum, a controlled choice of ambient light that avoids this spectral band is ideal, along with a camera that is maximally sensitive to it. An RGB LED light source produced the best SNR out of all sources that mimic room light temperature. A 675-nm LP filter on the camera input further reduced ambient light detected (optical density > 3), achieving maximal SNR for Cherenkov emission near 40. Reduction of the room light signal reduced artifacts from specular reflection on the tissue surface and also minimized spurious Cherenkov signals from non-tissue features such as bolus. CONCLUSIONS LP filtering during image acquisition for near-infrared light in tandem with narrow band LED illuminated rooms improves image quality, trading off the loss of red wavelengths for better removal of room light in the image. This spectral filtering is also critically important to remove specular reflection in the images and allow for imaging of Cherenkov emission through clear bolus. Beyond time-gated external beam therapy systems, the spectral separation methods can be utilized for background removal for continuous treatment delivery methods including proton pencil beam scanning systems and brachytherapy.
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Affiliation(s)
- Mahbubur Rahman
- Dartmouth College, Thayer School of Engineering, Hanover, New Hampshire, United States
| | - Petr Bruza
- Dartmouth College, Thayer School of Engineering, Hanover, New Hampshire, United States
| | - Rachael Hachadorian
- Dartmouth College, Thayer School of Engineering, Hanover, New Hampshire, United States
| | - Daniel Alexander
- Dartmouth College, Thayer School of Engineering, Hanover, New Hampshire, United States
| | - Xu Cao
- Dartmouth College, Thayer School of Engineering, Hanover, New Hampshire, United States
| | - Rongxiao Zhang
- Dartmouth College, Thayer School of Engineering, Hanover, New Hampshire, United States
- Dartmouth College, Geisel School of Medicine, Department of Radiation Oncology, Hanover, New Hampshire, United States
- Dartmouth-Hitchcock Medical Center, Norris Cotton Cancer Center, Lebanon, New Hampshire, United States
| | - David J. Gladstone
- Dartmouth College, Thayer School of Engineering, Hanover, New Hampshire, United States
- Dartmouth College, Geisel School of Medicine, Department of Radiation Oncology, Hanover, New Hampshire, United States
- Dartmouth-Hitchcock Medical Center, Norris Cotton Cancer Center, Lebanon, New Hampshire, United States
| | - Brian W. Pogue
- Dartmouth College, Thayer School of Engineering, Hanover, New Hampshire, United States
- Dartmouth-Hitchcock Medical Center, Norris Cotton Cancer Center, Lebanon, New Hampshire, United States
- Dartmouth College, Geisel School of Medicine, Department of Surgery, Hanover, New Hampshire, United States
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Decker SM, Alexander DA, Hachadorian RL, Zhang R, Gladstone DJ, Bruza P, Pogue BW. Estimation of diffuse Cherenkov optical emission from external beam radiation build-up in tissue. J Biomed Opt 2021; 26:JBO-210129RR. [PMID: 34545714 PMCID: PMC8451315 DOI: 10.1117/1.jbo.26.9.098003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/16/2021] [Accepted: 08/27/2021] [Indexed: 06/13/2023]
Abstract
SIGNIFICANCE Optical imaging of Cherenkov emission during radiation therapy could be used to verify dose delivery in real-time if a more comprehensive quantitative understanding of the factors affecting emission intensity could be developed. AIM This study aims to explore the change in diffuse Cherenkov emission intensity with x-ray beam energy from irradiated tissue, both theoretically and experimentally. APPROACH Derivation of the emitted Cherenkov signal was achieved using diffusion theory, and experimental studies with 6 to 18 MV energy x-rays were performed in tissue phantoms to confirm the model predictions as related to the radiation build-up factor with depth into tissue. RESULTS Irradiation at lower x-ray energies results in a greater surface dose and higher build-up slope, which results in a ∼46 % greater diffusely emitted Cherenkov signal per unit dose at 6 MV relative to 18 MV x-rays. However, this phenomenon competes with a decrease in signal from less Cherenkov photons being generated at lower energies, a ∼44 % reduction at 6 versus 18 MV. The result is an emitted Cherenkov signal that is nearly constant with beam energy. CONCLUSIONS This study explains why the observed Cherenkov emission from tissue is not a strong function of beam energy, despite the known strong correlation between Cherenkov intensity and particle energy in the absence of build-up and scattering effects.
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Affiliation(s)
- Savannah M. Decker
- Dartmouth College, Thayer School of Engineering, Hanover, New Hampshire, United States
| | - Daniel A. Alexander
- Dartmouth College, Thayer School of Engineering, Hanover, New Hampshire, United States
| | | | - Rongxiao Zhang
- Dartmouth College, Thayer School of Engineering, Hanover, New Hampshire, United States
- Dartmouth College, Geisel School of Medicine, Department of Medicine, Hanover, New Hampshire, United States
- Norris Cotton Cancer Center, Dartmouth–Hitchcock Medical Center, Lebanon, New Hampshire, United States
| | - David J. Gladstone
- Dartmouth College, Thayer School of Engineering, Hanover, New Hampshire, United States
- Dartmouth College, Geisel School of Medicine, Department of Medicine, Hanover, New Hampshire, United States
- Norris Cotton Cancer Center, Dartmouth–Hitchcock Medical Center, Lebanon, New Hampshire, United States
| | - Petr Bruza
- Dartmouth College, Thayer School of Engineering, Hanover, New Hampshire, United States
- DoseOptics LLC, Lebanon, New Hampshire, United States
| | - Brian W. Pogue
- Dartmouth College, Thayer School of Engineering, Hanover, New Hampshire, United States
- Dartmouth College, Geisel School of Medicine, Department of Medicine, Hanover, New Hampshire, United States
- DoseOptics LLC, Lebanon, New Hampshire, United States
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Cao X, Zhang R, Esipova TV, Allu SR, Ashraf R, Rahman M, Gunn JR, Bruza P, Gladstone DJ, Williams BB, Swartz HM, Hoopes PJ, Vinogradov SA, Pogue BW. Quantification of Oxygen Depletion During FLASH Irradiation In Vitro and In Vivo. Int J Radiat Oncol Biol Phys 2021; 111:240-248. [PMID: 33845146 PMCID: PMC8338745 DOI: 10.1016/j.ijrobp.2021.03.056] [Citation(s) in RCA: 78] [Impact Index Per Article: 26.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Revised: 03/28/2021] [Accepted: 03/31/2021] [Indexed: 01/01/2023]
Abstract
PURPOSE Delivery of radiation at ultrahigh dose rates (UHDRs), known as FLASH, has recently been shown to preferentially spare normal tissues from radiation damage compared with tumor tissues. However, the underlying mechanism of this phenomenon remains unknown, with one of the most widely considered hypotheses being that the effect is related to substantial oxygen depletion upon FLASH, thereby altering the radiochemical damage during irradiation, leading to different radiation responses of normal and tumor cells. Testing of this hypothesis would be advanced by direct measurement of tissue oxygen in vivo during and after FLASH irradiation. METHODS AND MATERIALS Oxygen measurements were performed in vitro and in vivo using the phosphorescence quenching method and a water-soluble molecular probe Oxyphor 2P. The changes in oxygen per unit dose (G-values) were quantified in response to irradiation by 10 MeV electron beam at either UHDR reaching 300 Gy/s or conventional radiation therapy dose rates of 0.1 Gy/s. RESULTS In vitro experiments with 5% bovine serum albumin solutions at 23°C resulted in G-values for oxygen consumption of 0.19 to 0.21 mm Hg/Gy (0.34-0.37 μM/Gy) for conventional irradiation and 0.16 to 0.17 mm Hg/Gy (0.28-0.30 μM/Gy) for UHDR irradiation. In vivo, the total decrease in oxygen after a single fraction of 20 Gy FLASH irradiation was 2.3 ± 0.3 mm Hg in normal tissue and 1.0 ± 0.2 mm Hg in tumor tissue (P < .00001), whereas no decrease in oxygen was observed from a single fraction of 20 Gy applied in conventional mode. CONCLUSIONS Our observations suggest that oxygen depletion to radiologically relevant levels of hypoxia is unlikely to occur in bulk tissue under FLASH irradiation. For the same dose, FLASH irradiation induces less oxygen consumption than conventional irradiation in vitro, which may be related to the FLASH sparing effect. However, the difference in oxygen depletion between FLASH and conventional irradiation could not be quantified in vivo because measurements of oxygen depletion under conventional irradiation are hampered by resupply of oxygen from the blood.
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Affiliation(s)
- Xu Cao
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire; Engineering Research Center of Molecular and Neuro Imaging of the Ministry of Education & School of Life Science and Technology, Xidian University, Xi'an, Shaanxi, China
| | - Rongxiao Zhang
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire; Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire; Department of Medicine, Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire
| | - Tatiana V Esipova
- Department of Biochemistry and Biophysics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania; Department of Chemistry, School or Arts and Sciences, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Srinivasa Rao Allu
- Department of Biochemistry and Biophysics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania; Department of Chemistry, School or Arts and Sciences, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Ramish Ashraf
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire
| | - Mahbubur Rahman
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire
| | - Jason R Gunn
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire
| | - Petr Bruza
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire
| | - David J Gladstone
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire; Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire; Department of Medicine, Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire
| | - Benjamin B Williams
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire; Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire; Department of Medicine, Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire
| | - Harold M Swartz
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire; Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire; Department of Medicine, Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire
| | - P Jack Hoopes
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire; Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire; Department of Surgery, Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire
| | - Sergei A Vinogradov
- Department of Biochemistry and Biophysics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania; Department of Chemistry, School or Arts and Sciences, University of Pennsylvania, Philadelphia, Pennsylvania.
| | - Brian W Pogue
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire; Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire; Department of Surgery, Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire.
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Andreozzi JM, Brůža P, Cammin J, Alexander DA, Pogue BW, Green O, Gladstone DJ. Optical emission-based phantom to verify coincidence of radiotherapy and imaging isocenters on an MR-linac. J Appl Clin Med Phys 2021; 22:252-261. [PMID: 34409766 PMCID: PMC8425893 DOI: 10.1002/acm2.13377] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2020] [Revised: 05/03/2021] [Accepted: 07/09/2021] [Indexed: 11/15/2022] Open
Abstract
Purpose Demonstrate a novel phantom design using a remote camera imaging method capable of concurrently measuring the position of the x‐ray isocenter and the magnetic resonance imaging (MRI) isocenter on an MR‐linac. Methods A conical frustum with distinct geometric features was machined out of plastic. The phantom was submerged in a small water tank, and aligned using room lasers on a MRIdian MR‐linac (ViewRay Inc., Cleveland, OH). The phantom physical isocenter was visualized in the MR images and related to the DICOM coordinate isocenter. To view the x‐ray isocenter, an intensified CMOS camera system (DoseOptics LLC., Hanover, NH) was placed at the foot of the treatment couch, and centered such that the optical axis of the camera was coincident with the central axis of the treatment bore. Two or four 8.3mm x 24.1cm beams irradiated the phantom from cardinal directions, producing an optical ring on the conical surface of the phantom. The diameter of the ring, measured at the peak intensity, was compared to the known diameter at the position of irradiation to determine the Z‐direction offset of the beam. A star‐shot method was employed on the front face of the frustum to determine X‐Y alignment of the MV beam. Known shifts were applied to the phantom to establish the sensitivity of the method. Results Couch translations, demonstrative of possible isocenter misalignments, on the order of 1mm were detectable for both the radiotherapy and MRI isocenters. Data acquired on the MR‐linac demonstrated an average error of 0.28mm(N=10, R2=0.997, σ=0.37mm) in established Z displacement, and 0.10mm(N=5, σ=0.34mm) in XY directions of the radiotherapy isocenter. Conclusions The phantom was capable of measuring both the MRI and radiotherapy treatment isocenters. This method has the potential to be of use in MR‐linac commissioning, and could be streamlined to be valuable in daily constancy checks of isocenter coincidence.
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Affiliation(s)
- Jacqueline M Andreozzi
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire, USA.,Department of Radiation Oncology, Moffitt Cancer Center, Tampa, Florida, USA
| | - Petr Brůža
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire, USA
| | - Jochen Cammin
- Department of Radiation Oncology, Washington University School of Medicine, St. Louis, Missouri, USA
| | - Daniel A Alexander
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire, USA
| | - Brian W Pogue
- Thayer School of Engineering and Department of Physics and Astronomy, Dartmouth College, Hanover, New Hampshire, USA
| | - Olga Green
- Department of Radiation Oncology, Washington University School of Medicine, St. Louis, Missouri, USA
| | - David J Gladstone
- Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire, USA.,Geisel School of Medicine, Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire, USA
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Rahman M, Ashraf MR, Zhang R, Bruza P, Dexter CA, Thompson L, Cao X, Williams BB, Hoopes PJ, Pogue BW, Gladstone DJ. Electron FLASH Delivery at Treatment Room Isocenter for Efficient Reversible Conversion of a Clinical LINAC. Int J Radiat Oncol Biol Phys 2021; 110:872-882. [PMID: 33444695 PMCID: PMC10416223 DOI: 10.1016/j.ijrobp.2021.01.011] [Citation(s) in RCA: 41] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2020] [Revised: 12/02/2020] [Accepted: 01/07/2021] [Indexed: 12/21/2022]
Abstract
PURPOSE In this study, procedures were developed to achieve efficient reversible conversion of a clinical linear accelerator (LINAC) and deliver ultrahigh-dose-rate (UHDR) electron or conventional beams to the treatment room isocenter for FLASH radiation therapy. METHODS AND MATERIALS The LINAC was converted to deliver UHDR beam within 20 minutes by retracting the x-ray target from the beam's path, positioning the carousel on an empty port, and selecting 10 MV photon beam energy in the treatment console. Dose rate surface and depth dose profiles were measured in solid water phantom at different field sizes with Gafchromic film and an optically stimulated luminescent dosimeter (OSLD). A pulse controller counted the pulses via scattered radiation signal and gated the delivery for a preset pulse count. A fast photomultiplier tube-based Cherenkov detector measured the per pulse beam output at a 2-ns sampling rate. After conversion back to clinical mode, conventional beam output, flatness, symmetry, field size, and energy were measured for all clinically commissioned energies. RESULTS The surface average dose rates at the isocenter for 1-cm diameter and 1.5-in diameter circular fields and for a jaws-wide-open field were 238 ± 5 Gy/s, 262 ± 5 Gy/s, and 290 ± 5 Gy/s, respectively. The radial symmetry of the beams was within 2.4%, 0.5%, and 0.2%, respectively. The doses from simultaneous irradiation of film and OSLD were within 1%. The photomultiplier tube showed the LINAC required ramp up time in the first 4 to 6 pulses before the output stabilized, after which its stability was within 3%. CONCLUSIONS At the isocenter of the treatment room, 10 MeV UHDR beams were achieved. The beam output was reproducible but requires further investigation of the ramp up time, equivalent to ∼1 Gy, requiring dose monitoring. The UHDR beam can irradiate both small and large subjects to investigate potential FLASH radiobiological effects in minimally modified clinical settings, and the dose rate can be further increased by reducing the source-to-surface distance.
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Affiliation(s)
- Mahbubur Rahman
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire.
| | - M Ramish Ashraf
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire
| | - Rongxiao Zhang
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire; Department of Medicine, Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire; Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire
| | - Petr Bruza
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire
| | - Chad A Dexter
- Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire
| | - Lawrence Thompson
- Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire
| | - Xu Cao
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire
| | - Benjamin B Williams
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire; Department of Medicine, Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire; Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire
| | - P Jack Hoopes
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire; Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire; Department of Surgery, Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire
| | - Brian W Pogue
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire; Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire; Department of Surgery, Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire
| | - David J Gladstone
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire; Department of Medicine, Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire; Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire
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Rahman M, Ashraf MR, Zhang R, Gladstone DJ, Cao X, Williams BB, Hoopes PJ, Pogue BW, Bruza P. Spatial and temporal dosimetry of individual electron FLASH beam pulses using radioluminescence imaging. Phys Med Biol 2021; 66:10.1088/1361-6560/ac0390. [PMID: 34015774 PMCID: PMC10468779 DOI: 10.1088/1361-6560/ac0390] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2020] [Accepted: 05/20/2021] [Indexed: 11/11/2022]
Abstract
Purpose.In this study, spatio-temporal beam profiling for electron ultra-high dose rate (UHDR; >40 Gy s-1) radiation via Cherenkov emission and radioluminescence imaging was investigated using intensified complementary metal-oxide-semiconductor cameras.Methods.The cameras, gated to FLASH optimized linear accelerator pulses, imaged radioluminescence and Cherenkov emission incited by single pulses of a UHDR (>40 Gy s-1) 10 MeV electron beam delivered to the isocenter. Surface dosimetry was investigated via imaging Cherenkov emission or scintillation from a solid water phantom or Gd2O2S:Tb screen positioned on top of the phantom, respectively. Projected depth-dose profiles were imaged from a tank filled with water (Cherenkov emission) and a 1 g l-1quinine sulfate solution (scintillation). These optical results were compared with projected lateral dose profiles measured by Gafchromic film at different depths, including the surface.Results.The per-pulse beam output from Cherenkov imaging agreed with the photomultiplier tube Cherenkov output to within 3% after about the first five to seven ramp-up pulses. Cherenkov emission and scintillation were linear with dose (R2 = 0.987 and 0.995, respectively) and independent of dose rate from ∼50 to 300 Gy s-1(0.18-0.91 Gy/pulse). The surface dose distribution from film agreed better with scintillation than with Cherenkov emission imaging (3%/3 mm gamma pass rates of 98.9% and 88.8%, respectively). Using a 450 nm bandpass filter, the quinine sulfate-based water imaging of the projected depth optical profiles agreed with the projected film dose to within 5%.Conclusion.The agreement of surface dosimetry using scintillation screen imaging and Gafchromic film suggests it can verify the consistency of daily beam quality assurance parameters with an accuracy of around 2% or 2 mm. Cherenkov-based surface dosimetry was affected by the target's optical properties, prompting additional calibration. In projected depth-dose profiling, scintillation imaging via spectral suppression of Cherenkov emission provided the best match to film. Both camera-based imaging modalities resolved dose from single UHDR beam pulses of up to 60 Hz repetition rate and 1 mm spatial resolution.
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Affiliation(s)
- Mahbubur Rahman
- Thayer School of Engineering, Dartmouth College, Hanover NH 03755, US
| | - M. Ramish Ashraf
- Thayer School of Engineering, Dartmouth College, Hanover NH 03755, US
| | - Rongxiao Zhang
- Thayer School of Engineering, Dartmouth College, Hanover NH 03755, US
- Department of Medicine, Radiation Oncology, Geisel School of Medicine, Dartmouth College Hanover NH 03755 USA
- Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, NH 03756 USA
| | - David J. Gladstone
- Thayer School of Engineering, Dartmouth College, Hanover NH 03755, US
- Department of Medicine, Radiation Oncology, Geisel School of Medicine, Dartmouth College Hanover NH 03755 USA
- Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, NH 03756 USA
| | - Xu Cao
- Thayer School of Engineering, Dartmouth College, Hanover NH 03755, US
| | - Benjamin B. Williams
- Thayer School of Engineering, Dartmouth College, Hanover NH 03755, US
- Department of Medicine, Radiation Oncology, Geisel School of Medicine, Dartmouth College Hanover NH 03755 USA
- Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, NH 03756 USA
| | - P. Jack Hoopes
- Thayer School of Engineering, Dartmouth College, Hanover NH 03755, US
- Department of Medicine, Radiation Oncology, Geisel School of Medicine, Dartmouth College Hanover NH 03755 USA
- Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, NH 03756 USA
- Department of Surgery, Geisel School of Medicine, Dartmouth College, Hanover NH 03755 USA
| | - Brian W. Pogue
- Thayer School of Engineering, Dartmouth College, Hanover NH 03755, US
- Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, NH 03756 USA
- Department of Surgery, Geisel School of Medicine, Dartmouth College, Hanover NH 03755 USA
| | - Petr Bruza
- Thayer School of Engineering, Dartmouth College, Hanover NH 03755, US
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Gladstone DJ, Aviv RI, Demchuk AM, Hill MD, Thorpe KE, Khoury JC, Sucharew HJ, Al-Ajlan F, Butcher K, Dowlatshahi D, Gubitz G, De Masi S, Hall J, Gregg D, Mamdani M, Shamy M, Swartz RH, Del Campo CM, Cucchiara B, Panagos P, Goldstein JN, Carrozzella J, Jauch EC, Broderick JP, Flaherty ML. Effect of Recombinant Activated Coagulation Factor VII on Hemorrhage Expansion Among Patients With Spot Sign-Positive Acute Intracerebral Hemorrhage: The SPOTLIGHT and STOP-IT Randomized Clinical Trials. JAMA Neurol 2021; 76:1493-1501. [PMID: 31424491 DOI: 10.1001/jamaneurol.2019.2636] [Citation(s) in RCA: 66] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Importance Intracerebral hemorrhage (ICH) is a devastating stroke type that lacks effective treatments. An imaging biomarker of ICH expansion-the computed tomography (CT) angiography spot sign-may identify a subgroup that could benefit from hemostatic therapy. Objective To investigate whether recombinant activated coagulation factor VII (rFVIIa) reduces hemorrhage expansion among patients with spot sign-positive ICH. Design, Setting, and Participants In parallel investigator-initiated, multicenter, double-blind, placebo-controlled randomized clinical trials in Canada ("Spot Sign" Selection of Intracerebral Hemorrhage to Guide Hemostatic Therapy [SPOTLIGHT]) and the United States (The Spot Sign for Predicting and Treating ICH Growth Study [STOP-IT]) with harmonized protocols and a preplanned individual patient-level pooled analysis, patients presenting to the emergency department with an acute primary spontaneous ICH and a spot sign on CT angiography were recruited. Data were collected from November 2010 to May 2016. Data were analyzed from November 2016 to May 2017. Interventions Eligible patients were randomly assigned 80 μg/kg of intravenous rFVIIa or placebo as soon as possible within 6.5 hours of stroke onset. Main Outcomes and Measures Head CT at 24 hours assessed parenchymal ICH volume expansion from baseline (primary outcome) and total (ie, parenchymal plus intraventricular) hemorrhage volume expansion (secondary outcome). The pooled analysis compared hemorrhage expansion between groups by analyzing 24-hour volumes in a linear regression model adjusted for baseline volumes, time from stroke onset to treatment, and trial. Results Of the 69 included patients, 35 (51%) were male, and the median (interquartile range [IQR]) age was 70 (59-80) years. Baseline median (IQR) ICH volumes were 16.3 (9.6-39.2) mL in the rFVIIa group and 20.4 (8.6-32.6) mL in the placebo group. Median (IQR) time from CT to treatment was 71 (57-96) minutes, and the median (IQR) time from stroke onset to treatment was 178 (138-197) minutes. The median (IQR) increase in ICH volume from baseline to 24 hours was small in both the rFVIIa group (2.5 [0-10.2] mL) and placebo group (2.6 [0-6.6] mL). After adjustment, there was no difference between groups on measures of ICH or total hemorrhage expansion. At 90 days, 9 of 30 patients in the rFVIIa group and 13 of 34 in the placebo group had died or were severely disabled (P = .60). Conclusions and Relevance Among patients with spot sign-positive ICH treated a median of about 3 hours from stroke onset, rFVIIa did not significantly improve radiographic or clinical outcomes. Trial Registration ClinicalTrials.gov identifier: NCT01359202 and NCT00810888.
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Affiliation(s)
- David J Gladstone
- Division of Neurology, Department of Medicine, University of Toronto, Toronto, Ontario, Canada.,Hurvitz Brain Sciences Program, Sunnybrook Research Institute, Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada
| | - Richard I Aviv
- Hurvitz Brain Sciences Program, Sunnybrook Research Institute, Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada.,Department of Medical Imaging, University of Toronto, Toronto, Ontario, Canada
| | - Andrew M Demchuk
- Department of Clinical Neurosciences and Radiology, Hotchkiss Brain Institute, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Michael D Hill
- Department of Clinical Neurosciences and Radiology, Hotchkiss Brain Institute, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada.,Department of Community Health Sciences and Medicine, Hotchkiss Brain Institute, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Kevin E Thorpe
- Dalla Lana School of Public Health, University of Toronto, Toronto, Ontario, Canada.,Applied Health Research Centre, Li Ka Shing Knowledge Institute of St Michael's Hospital, Toronto, Ontario, Canada
| | - Jane C Khoury
- Division of Biostatistics and Epidemiology, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio.,Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, Ohio
| | - Heidi J Sucharew
- Division of Biostatistics and Epidemiology, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio.,Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, Ohio
| | - Fahad Al-Ajlan
- Department of Neurosciences, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - Ken Butcher
- University of New South Wales, Prince of Wales Clinical School, Sydney, New South Wales, Australia
| | - Dar Dowlatshahi
- Ottawa Hospital Research Institute, University of Ottawa, Ottawa, Ontario, Canada
| | - Gord Gubitz
- Division of Neurology, Department of Medicine, Dalhousie University, Halifax, Nova Scotia, Canada
| | - Stephanie De Masi
- Applied Health Research Centre, Li Ka Shing Knowledge Institute of St Michael's Hospital, Toronto, Ontario, Canada
| | - Judith Hall
- Applied Health Research Centre, Li Ka Shing Knowledge Institute of St Michael's Hospital, Toronto, Ontario, Canada
| | - David Gregg
- Division of Cardiology, Department of Medicine, Medical University of South Carolina, Charleston
| | - Muhammad Mamdani
- Applied Health Research Centre, Li Ka Shing Knowledge Institute of St Michael's Hospital, Toronto, Ontario, Canada
| | | | - Richard H Swartz
- Division of Neurology, Department of Medicine, University of Toronto, Toronto, Ontario, Canada.,Hurvitz Brain Sciences Program, Sunnybrook Research Institute, Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada
| | - C Martin Del Campo
- Division of Neurology, Department of Medicine, University of Toronto, Toronto, Ontario, Canada
| | - Brett Cucchiara
- Department of Neurology, University of Pennsylvania, Philadelphia
| | - Peter Panagos
- Department of Emergency Medicine, Washington University in St Louis, St Louis, Missouri
| | - Joshua N Goldstein
- Department of Emergency Medicine, Massachusetts General Hospital, Boston
| | - Janice Carrozzella
- Department of Radiology, University of Cincinnati Academic Health Center, Cincinnati, Ohio
| | - Edward C Jauch
- Mission Research Institute, Mission Health System, Asheville, North Carolina
| | - Joseph P Broderick
- Department of Neurology, University of Cincinnati Academic Health Center, Cincinnati, Ohio
| | - Matthew L Flaherty
- Department of Neurology, University of Cincinnati Academic Health Center, Cincinnati, Ohio
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Pogue BW, Zhang R, Gladstone DJ. A roadmap for research in medical physics via academic medical centers: The DIVERT Model. Med Phys 2021; 48:3151-3159. [PMID: 33735472 PMCID: PMC10714276 DOI: 10.1002/mp.14849] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Revised: 02/14/2021] [Accepted: 03/03/2021] [Indexed: 11/10/2022] Open
Abstract
The field of medical physics has struggled with the role of research in recent years, as professional interests have dominated its growth toward clinical service. This article focuses on the subset of medical physics programs within academic medical centers and how a refocused academic mission within these centers should drive and support Discovery and Invention with Ventures and Engineering for Research Translation (DIVERT). A roadmap to a DIVERT-based scholarly research program is discussed here around the core building blocks of: (a) creativity in research and team building, (b) improved quality metrics to assess activity, (c) strategic partnerships and spinoff directions that extend capabilities, and (d) future directions driven by faculty-led initiatives. Within academia, it is the unique discoveries and inventions of faculty that lead to their recognition as scholars, and leads to financial support for their research programs and reconition of their intellectual contributions. Innovation must also be coupled to translation to demonstrate outcome successes. These ingredients are critical for research funding, and the two-decade growth in biomedical engineering research funding is an illustration of this, where technology invention has been the goal. This record can be contrasted with flat funding within radiation oncology and radiology, where a growing fraction of research is more procedure-based. However, some centers are leading the change of the definition of medical physics, by the inclusion or assimilation of researchers in fields such as biomedical engineering, machine learning, or data science, thereby widening the scope for new discoveries and inventions. New approaches to the assessment of research quality can help realize this model, revisiting the measures of success and impact. While research partnerships with large industry are productive, newer efforts that foster enterprise startups are changing how institutions see the benefits of the connection between academic innovation and affiliated startup company formation. This innovation-to-enterprise focus can help to cultivate a broader bandwidth of donor-to-investor networks. There are many predictions on future directions in medical physics, yet the actual inventive and discovery steps come from individual research faculty creativity. All success through a DIVERT model requires that faculty-led initiatives span the gap from invention to translation, with support from institutional leadership at all steps in the process. Institutional investment in faculty through endowments or clinical revenues will likely need to increase in the coming years due to the relative decreasing size of grants. Yet, radiology and radiation oncology are both high-revenue, translational fields, with the capacity to synergistically support clinical and research operations through large infrastructures that are mutually beneficial. These roadmap principles can provide a pathway for committed academic medical physics programs in scholarly leadership that will preserve medical physics as an active part of university academics.
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Affiliation(s)
- Brian W Pogue
- Thayer School of Engineering at Dartmouth, Geisel School of Medicine at Dartmouth, Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, NH, USA
| | - Rongxiao Zhang
- Thayer School of Engineering at Dartmouth, Geisel School of Medicine at Dartmouth, Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, NH, USA
| | - David J. Gladstone
- Thayer School of Engineering at Dartmouth, Geisel School of Medicine at Dartmouth, Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, NH, USA
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Alexander DA, Bruza P, Rassias AG, Andreozzi JM, Pogue BW, Zhang R, Gladstone DJ. Visual Isocenter Position Enhanced Review (VIPER): a Cherenkov imaging-based solution for MR-linac daily QA. Med Phys 2021; 48:2750-2759. [PMID: 33887796 DOI: 10.1002/mp.14892] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2020] [Revised: 02/28/2021] [Accepted: 04/05/2021] [Indexed: 11/07/2022] Open
Abstract
PURPOSE This study demonstrates a robust Cherenkov imaging-based solution to MR-Linac daily QA, including mechanical-imaging-radiation isocenter coincidence verification. METHODS A fully enclosed acrylic cylindrical phantom was designed to be mountable to the existing jig, indexable to the treatment couch. An ABS plastic conical structure was fixed inside the phantom, held in place with 3D-printed spacers, and filled with water allowing for high edge contrast on MR imaging scans. Both a star shot plan and a four-angle sheet beam plan were delivered to the phantom; the former allowed for radiation isocenter localization in the x-z plane (A/P and L/R directions) relative to physical landmarks on the phantom, and the latter allowed for the longitudinal position of the sheet beam to be encoded as a ring of Cherenkov radiation emitted from the phantom, allowing for isocenter localization on the y-axis (S/I directions). A custom software application was developed to perform near-real-time analysis of the data by any clinical user. RESULTS Calibration procedures show that linearity between longitudinal position and optical ring diameter is high (R2 > 0.99), and that RMSE is low (0.184 mm). The star shot analysis showed a minimum circle radius of 0.34 mm. The final isocenter coincidence measurements in the lateral, longitudinal, and vertical directions were -0.61 mm, 0.55 mm, and -0.14 mm, respectively, and the total 3D distance coincidence was 0.83 mm, with each of these being below 2 mm tolerance. CONCLUSION This novel system provided an efficient, MR safe, all-in-one method for acquisition and near-real-time analysis of isocenter coincidence data. This represents a direct measurement of the 3D isocentricity. The combination of this phantom and the custom analysis application makes this solution readily clinically deployable after the longitudinal analysis of performance consistency.
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Affiliation(s)
| | - Petr Bruza
- Thayer School of Engineering, Dartmouth College, Hanover, NH, USA
| | - Aris G Rassias
- Thayer School of Engineering, Dartmouth College, Hanover, NH, USA
| | | | - Brian W Pogue
- Thayer School of Engineering, Dartmouth College, Hanover, NH, USA
- Geisel School of Medicine, Dartmouth College, Hanover, NH, USA
- Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, NH, USA
| | - Rongxiao Zhang
- Thayer School of Engineering, Dartmouth College, Hanover, NH, USA
- Geisel School of Medicine, Dartmouth College, Hanover, NH, USA
- Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, NH, USA
| | - David J Gladstone
- Thayer School of Engineering, Dartmouth College, Hanover, NH, USA
- Geisel School of Medicine, Dartmouth College, Hanover, NH, USA
- Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, NH, USA
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Shamy M, Dewar B, Fitzpatrick T, Gladstone DJ, Menon BK, Swartz R, Hill MD, Dowlatshahi D. Deferral of Consent: Recent Lessons From Canadian Acute Stroke Trials. Stroke 2021; 52:e326-e327. [PMID: 33947215 DOI: 10.1161/strokeaha.121.034655] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
[Figure: see text].
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Affiliation(s)
- Michel Shamy
- Ottawa Hospital and Department of Medicine, University of Ottawa (M.S., D.D.), Ontario, Canada.,Ottawa Hospital Research Institute (M.S., BD., D.D.), Ontario, Canada
| | - Brian Dewar
- Ottawa Hospital Research Institute (M.S., BD., D.D.), Ontario, Canada
| | - Tess Fitzpatrick
- Sunnybrook Hospital, University of Toronto, Ontario, Canada (T.F., D.J.G., R.S.)
| | - David J Gladstone
- Sunnybrook Hospital, University of Toronto, Ontario, Canada (T.F., D.J.G., R.S.)
| | - Bijoy K Menon
- Foothills Medical Centre, University of Calgary, Alberta, Canada (M.D.H., B.K.M.)
| | - Richard Swartz
- Sunnybrook Hospital, University of Toronto, Ontario, Canada (T.F., D.J.G., R.S.)
| | - Michael D Hill
- Foothills Medical Centre, University of Calgary, Alberta, Canada (M.D.H., B.K.M.)
| | - Dar Dowlatshahi
- Ottawa Hospital and Department of Medicine, University of Ottawa (M.S., D.D.), Ontario, Canada
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Gladstone DJ, Wachter R, Schmalstieg-Bahr K, Quinn FR, Hummers E, Ivers N, Marsden T, Thornton A, Djuric A, Suerbaum J, von Grünhagen D, McIntyre WF, Benz AP, Wong JA, Merali F, Henein S, Nichol C, Connolly SJ, Healey JS. Screening for Atrial Fibrillation in the Older Population: A Randomized Clinical Trial. JAMA Cardiol 2021; 6:558-567. [PMID: 33625468 DOI: 10.1001/jamacardio.2021.0038] [Citation(s) in RCA: 83] [Impact Index Per Article: 27.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Importance Atrial fibrillation (AF) is a major cause of preventable strokes. Screening asymptomatic individuals for AF may increase anticoagulant use for stroke prevention. Objective To evaluate 2 home-based AF screening interventions. Design, Setting, and Participants This multicenter randomized clinical trial recruited individuals from primary care practices aged 75 years or older with hypertension and without known AF. From April 5, 2015, to March 26, 2019, 856 participants were enrolled from 48 practices. Interventions The control group received standard care (routine clinical follow-up plus a pulse check and heart auscultation at baseline and 6 months). The screening group received a 2-week continuous electrocardiographic (cECG) patch monitor to wear at baseline and at 3 months, in addition to standard care. The screening group also received automated home blood pressure (BP) machines with oscillometric AF screening capability to use twice-daily during the cECG monitoring periods. Main Outcomes and Measures With intention-to-screen analysis, the primary outcome was AF detected by cECG monitoring or clinically within 6 months. Secondary outcomes included anticoagulant use, device adherence, and AF detection by BP monitors. Results Of the 856 participants, 487 were women (56.9%); mean (SD) age was 80.0 (4.0) years. Median cECG wear time was 27.4 of 28 days (interquartile range [IQR], 18.4-28.0 days). In the primary analysis, AF was detected in 23 of 434 participants (5.3%) in the screening group vs 2 of 422 (0.5%) in the control group (relative risk, 11.2; 95% CI, 2.7-47.1; P = .001; absolute difference, 4.8%; 95% CI, 2.6%-7.0%; P < .001; number needed to screen, 21). Of those with cECG-detected AF, median total time spent in AF was 6.3 hours (IQR, 4.2-14.0 hours; range 1.3 hours-28 days), and median duration of the longest AF episode was 5.7 hours (IQR, 2.9-12.9 hours). Anticoagulation was initiated in 15 of 20 patients (75.0%) with cECG-detected AF. By 6 months, anticoagulant therapy had been prescribed for 18 of 434 participants (4.1%) in the screening group vs 4 of 422 (0.9%) in the control group (relative risk, 4.4; 95% CI, 1.5-12.8; P = .007; absolute difference, 3.2%; 95% CI, 1.1%-5.3%; P = .003). Twice-daily AF screening using the home BP monitor had a sensitivity of 35.0% (95% CI, 15.4%-59.2%), specificity of 81.0% (95% CI, 76.7%-84.8%), positive predictive value of 8.9% (95% CI, 4.9%-15.5%), and negative predictive value of 95.9% (95% CI, 94.5%-97.0%). Adverse skin reactions requiring premature discontinuation of cECG monitoring occurred in 5 of 434 participants (1.2%). Conclusions and Relevance In this randomized clinical trial, among older community-dwelling individuals with hypertension, AF screening with a wearable cECG monitor was well tolerated, increased AF detection 10-fold, and prompted initiation of anticoagulant therapy in most cases. Compared with continuous ECG, intermittent oscillometric screening with a BP monitor was an inferior strategy for detecting paroxysmal AF. Large trials with hard clinical outcomes are now needed to evaluate the potential benefits and harms of AF screening. Trial Registration ClinicalTrials.gov Identifier: NCT02392754.
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Affiliation(s)
- David J Gladstone
- Hurvitz Brain Sciences Program, Sunnybrook Research Institute, and Division of Neurology, Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada.,Division of Neurology, Department of Medicine, University of Toronto, Toronto, Ontario, Canada
| | - Rolf Wachter
- Clinic and Policlinic for Cardiology, University Hospital, Leipzig, Germany.,Department of Cardiology, University Medical Center Göttingen, Göttingen, Germany.,DZHK (German Centre for Cardiovascular Research), partner site Göttingen, Göttingen, Germany
| | - Katharina Schmalstieg-Bahr
- Department of General Practice, University Medical Center Göttingen, Göttingen, Germany.,Department of General Practice and Primary Care, University Medical Center Hamburg-Eppendorf, Hamburg-Eppendorf, Germany
| | - F Russell Quinn
- Libin Cardiovascular Institute, University of Calgary, Calgary, Alberta, Canada
| | - Eva Hummers
- DZHK (German Centre for Cardiovascular Research), partner site Göttingen, Göttingen, Germany.,Department of General Practice, University Medical Center Göttingen, Göttingen, Germany
| | - Noah Ivers
- Women's College Hospital, Department of Family and Community Medicine, University of Toronto, Toronto, Ontario, Canada
| | - Tamara Marsden
- Population Health Research Institute, McMaster University, Hamilton, Ontario, Canada
| | - Andrea Thornton
- Population Health Research Institute, McMaster University, Hamilton, Ontario, Canada
| | - Angie Djuric
- Population Health Research Institute, McMaster University, Hamilton, Ontario, Canada
| | - Johanna Suerbaum
- Department of Cardiology, University Medical Center Göttingen, Göttingen, Germany.,DZHK (German Centre for Cardiovascular Research), partner site Göttingen, Göttingen, Germany
| | - Doris von Grünhagen
- Clinic for Cardiology and Pneumology, University Medicine Göttingen, Göttingen, Germany
| | - William F McIntyre
- Population Health Research Institute, McMaster University, Hamilton, Ontario, Canada
| | - Alexander P Benz
- Population Health Research Institute, McMaster University, Hamilton, Ontario, Canada
| | - Jorge A Wong
- Population Health Research Institute, McMaster University, Hamilton, Ontario, Canada
| | | | - Sam Henein
- Southlake Regional Health Centre, Newmarket, Ontario, Canada
| | - Chris Nichol
- Camrose Primary Care Network, Camrose, Alberta, Canada
| | - Stuart J Connolly
- Population Health Research Institute, McMaster University, Hamilton, Ontario, Canada
| | - Jeff S Healey
- Population Health Research Institute, McMaster University, Hamilton, Ontario, Canada
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Ashraf M, Rahman M, Zhang R, Cao X, Williams BB, Hoopes PJ, Gladstone DJ, Pogue BW, Bruza P. Technical Note: Single-pulse beam characterization for FLASH-RT using optical imaging in a water tank. Med Phys 2021; 48:2673-2681. [PMID: 33730367 PMCID: PMC10771323 DOI: 10.1002/mp.14843] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Revised: 03/10/2021] [Accepted: 03/12/2021] [Indexed: 11/07/2022] Open
Abstract
PURPOSE High dose rate conditions, coupled with problems related to small field dosimetry, make dose characterization for FLASH-RT challenging. Most conventional dosimeters show significant dependence on dose rate at ultra-high dose rate conditions or fail to provide sufficiently fast temporal data for pulse to pulse dosimetry. Here fast 2D imaging of radioluminescence from a water and quinine phantom was tested for dosimetry of individual 4 μs linac pulses. METHODS A modified clinical linac delivered an electron FLASH beam of >50 Gy/s to clinical isocenter. This modification removed the x-ray target and flattening filter, leading to a beam that was symmetric and gaussian, as verified with GafChromic EBT-XD film. Lateral projected 2D dose distributions for each linac pulse were imaged in a quinine-doped water tank using a gated intensified camera, and an inverse Abel transform reconstruction provided 3D images for on-axis depth dose values. A total of 20 pulses were delivered with a 10 MeV, 1.5 cm circular beam, and beam with jaws wide open (40 × 40 cm2 ), and a 3D dose distribution was recovered for each pulse. Beam output was analyzed on a pulse by pulse basis. RESULTS The Rp , Dmax , and the R50 measured with film and optical methods agreed to within 1 mm for the 1.5 cm circular beam and the beam with jaws wide open. Cross beam profiles for both beams agreed with film data with >95% passing rate (2%/2 mm gamma criteria). The optical central axis depth dose agreed with film data, except for near the surface. A temporal pulse analysis revealed a ramp-up period where the dose per pulse increased for the first few pulses and then stabilized. CONCLUSIONS Optical imaging of radioluminescence was presented as a valuable tool for establishing a baseline for the recently initiated electron FLASH beam at our institution.
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Affiliation(s)
- M.Ramish Ashraf
- Thayer School of Engineering, Dartmouth College, Hanover NH 03755, US
| | - Mahbubur Rahman
- Thayer School of Engineering, Dartmouth College, Hanover NH 03755, US
| | - Rongxiao Zhang
- Thayer School of Engineering, Dartmouth College, Hanover NH 03755, US
- Department of Medicine, Geisel School of Medicine, Dartmouth College Hanover NH 03755 USA
- Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, NH 03756 USA
| | - Xu Cao
- Thayer School of Engineering, Dartmouth College, Hanover NH 03755, US
| | - Benjamin B. Williams
- Thayer School of Engineering, Dartmouth College, Hanover NH 03755, US
- Department of Medicine, Geisel School of Medicine, Dartmouth College Hanover NH 03755 USA
- Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, NH 03756 USA
| | - P. Jack Hoopes
- Thayer School of Engineering, Dartmouth College, Hanover NH 03755, US
- Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, NH 03756 USA
- Department of Surgery, Geisel School of Medicine, Dartmouth College, Hanover NH 0375 USA
| | - David J. Gladstone
- Thayer School of Engineering, Dartmouth College, Hanover NH 03755, US
- Department of Medicine, Geisel School of Medicine, Dartmouth College Hanover NH 03755 USA
- Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, NH 03756 USA
| | - Brian W. Pogue
- Thayer School of Engineering, Dartmouth College, Hanover NH 03755, US
- Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, NH 03756 USA
- Department of Surgery, Geisel School of Medicine, Dartmouth College, Hanover NH 0375 USA
| | - Petr Bruza
- Thayer School of Engineering, Dartmouth College, Hanover NH 03755, US
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Hachadorian R, Farwell JC, Bruza P, Jermyn M, Gladstone DJ, Pogue BW, Jarvis LA. Verification of field match lines in whole breast radiation therapy using Cherenkov imaging. Radiother Oncol 2021; 160:90-96. [PMID: 33892022 DOI: 10.1016/j.radonc.2021.04.013] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2020] [Revised: 03/17/2021] [Accepted: 04/09/2021] [Indexed: 01/05/2023]
Abstract
PURPOSE In mono-isocentric radiation therapy treatment plans designed to treat the whole breast and supraclavicular lymph nodes, the fields meet at isocenter, forming the match line. Insufficient coverage at the match line can lead to recurrence, and overlap over weeks of treatment can lead to increased risk of healthy tissue toxicity. Cherenkov imaging was used to assess the accuracy of delivery at the match line and identify potential incidents during patient treatments. METHODS AND MATERIALS A controlled calibration was constructed from the deconvolved Cherenkov images from the delivery of a modified patient treatment plan to an anthropomorphic phantom with introduced separation and overlap. The trend from this calibration was then used to evaluate the field match line for accuracy and inter-fraction consistency for two patients. RESULTS The intersection point between matching field profiles was directly correlated to the distance (gap/overlap) between the fields (anthropomorphic phantom R2 = 0.994 "breath hold" and R2 = 0.990 "free breathing"). The profile intersection points from two patients' imaging sessions yielded an average of +1.40 mm offset (overlap) and -1.32 mm offset (gap), thereby introducing roughly a 25.0% over-dose and a -23.6% under-dose (R2 = 0.994). CONCLUSIONS This study shows that field match regions can be detected and quantified by taking deconvolved Cherenkov images and using their product image to create steep intensity gradients, causing match lines to stand out. These regions can then be quantitatively translated into a dose consequence. This approach offers a high sensitivity detection method which can quantify match line variability and errors in vivo.
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Affiliation(s)
| | | | - Petr Bruza
- Thayer School of Engineering, Dartmouth College, Hanover, United States
| | - Michael Jermyn
- Thayer School of Engineering, Dartmouth College, Hanover, United States; DoseOptics LLC, Lebanon, United States
| | - David J Gladstone
- Thayer School of Engineering, Dartmouth College, Hanover, United States; Norris Cotton Cancer Center at Dartmouth Hitchcock Medical Center, Lebanon, United States; Geisel School of Medicine, Dartmouth College, Hanover, United States
| | - Brian W Pogue
- Thayer School of Engineering, Dartmouth College, Hanover, United States; DoseOptics LLC, Lebanon, United States; Norris Cotton Cancer Center at Dartmouth Hitchcock Medical Center, Lebanon, United States; Geisel School of Medicine, Dartmouth College, Hanover, United States
| | - Lesley A Jarvis
- Norris Cotton Cancer Center at Dartmouth Hitchcock Medical Center, Lebanon, United States; Geisel School of Medicine, Dartmouth College, Hanover, United States.
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Jarvis LA, Hachadorian RL, Jermyn M, Bruza P, Alexander DA, Tendler II, Williams BB, Gladstone DJ, Schaner PE, Zaki BI, Pogue BW. Initial Clinical Experience of Cherenkov Imaging in External Beam Radiation Therapy Identifies Opportunities to Improve Treatment Delivery. Int J Radiat Oncol Biol Phys 2021; 109:1627-1637. [PMID: 33227443 PMCID: PMC10544920 DOI: 10.1016/j.ijrobp.2020.11.013] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2020] [Revised: 10/05/2020] [Accepted: 11/05/2020] [Indexed: 12/18/2022]
Abstract
PURPOSE The value of Cherenkov imaging as an on-patient, real-time, treatment delivery verification system was examined in a 64-patient cohort during routine radiation treatments in a single-center study. METHODS AND MATERIALS Cherenkov cameras were mounted in treatment rooms and used to image patients during their standard radiation therapy regimen for various sites, predominantly for whole breast and total skin electron therapy. For most patients, multiple fractions were imaged, with some involving bolus or scintillators on the skin. Measures of repeatability were calculated with a mean distance to conformity (MDC) for breast irradiation images. RESULTS In breast treatments, Cherenkov images identified fractions when treatment delivery resulted in dose on the contralateral breast, the arm, or the chin and found nonideal bolus positioning. In sarcoma treatments, safe positioning of the contralateral leg was monitored. For all 199 imaged breast treatment fields, the interfraction MDC was within 7 mm compared with the first day of treatment (with only 7.5% of treatments exceeding 3 mm), and all but 1 fell within 7 mm relative to the treatment plan. The value of imaging dose through clear bolus or quantifying surface dose with scintillator dots was examined. Cherenkov imaging also was able to assess field match lines in cerebral-spinal and breast irradiation with nodes. Treatment imaging of other anatomic sites confirmed the value of surface dose imaging more broadly. CONCLUSIONS Daily radiation therapy can be imaged routinely via Cherenkov emissions. Both the real-time images and the posttreatment, cumulative images provide surrogate maps of surface dose delivery that can be used for incident discovery and/or continuous improvement in many delivery techniques. In this initial 64-patient cohort, we discovered 6 minor incidents using Cherenkov imaging; these otherwise would have gone undetected. In addition, imaging provides automated, quantitative metrics useful for determining the quality of radiation therapy delivery.
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Affiliation(s)
- Lesley A Jarvis
- Department of Medicine, Section of Radiation Oncology, Geisel School of Medicine at Dartmouth, Hanover, New Hampshire.
| | | | - Michael Jermyn
- Thayer School of Engineering at Dartmouth, Hanover, New Hampshire
| | - Petr Bruza
- Thayer School of Engineering at Dartmouth, Hanover, New Hampshire
| | | | - Irwin I Tendler
- Thayer School of Engineering at Dartmouth, Hanover, New Hampshire
| | - Benjamin B Williams
- Department of Medicine, Section of Radiation Oncology, Geisel School of Medicine at Dartmouth, Hanover, New Hampshire; Thayer School of Engineering at Dartmouth, Hanover, New Hampshire
| | - David J Gladstone
- Department of Medicine, Section of Radiation Oncology, Geisel School of Medicine at Dartmouth, Hanover, New Hampshire; Thayer School of Engineering at Dartmouth, Hanover, New Hampshire
| | - Philip E Schaner
- Department of Medicine, Section of Radiation Oncology, Geisel School of Medicine at Dartmouth, Hanover, New Hampshire
| | - Bassem I Zaki
- Department of Medicine, Section of Radiation Oncology, Geisel School of Medicine at Dartmouth, Hanover, New Hampshire
| | - Brian W Pogue
- Thayer School of Engineering at Dartmouth, Hanover, New Hampshire
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50
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Rahman M, Ramish Ashraf M, Zhang R, Bruza P, Dexter CA, Thompson L, Cao X, Williams BB, Jack Hoopes P, Pogue BW, Gladstone DJ. In Reply to Newell et al. Int J Radiat Oncol Biol Phys 2021; 110:909-910. [PMID: 33811977 DOI: 10.1016/j.ijrobp.2021.03.045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2021] [Accepted: 03/23/2021] [Indexed: 11/18/2022]
Affiliation(s)
- Mahbubur Rahman
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire
| | - M Ramish Ashraf
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire
| | - Rongxiao Zhang
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire; Department of Medicine, Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire; Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire
| | - Petr Bruza
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire
| | - Chad A Dexter
- Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire
| | - Lawrence Thompson
- Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire
| | - Xu Cao
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire
| | - Benjamin B Williams
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire; Department of Medicine, Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire; Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire
| | - P Jack Hoopes
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire; Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire; Department of Surgery, Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire
| | - Brian W Pogue
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire; Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire; Department of Surgery, Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire
| | - David J Gladstone
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire; Department of Medicine, Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire; Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire
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