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Liang B, Gong G, Tong Y, Wang L, Su Y, Wang H, Li Z, Yan H, Zhang X, Yin Y. Quantitative analysis of the impact of respiratory state on the heartbeat-induced movements of the heart and its substructures. Radiat Oncol 2024; 19:18. [PMID: 38317205 PMCID: PMC10840203 DOI: 10.1186/s13014-023-02396-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2023] [Accepted: 12/23/2023] [Indexed: 02/07/2024] Open
Abstract
PURPOSE This study seeks to examine the influence of the heartbeat on the position, volume, and shape of the heart and its substructures during various breathing states. The findings of this study will serve as a valuable reference for dose-volume evaluation of the heart and its substructures in radiotherapy for treating thoracic tumors. METHODS Twenty-three healthy volunteers were enrolled in this study, and cine four-dimensional magnetic resonance images were acquired during periods of end-inspiration breath holding (EIBH), end-expiration breath holding (EEBH), and deep end-inspiration breath holding (DIBH). The MR images were used to delineate the heart and its substructures, including the heart, pericardium, left ventricle (LV), left ventricular myocardium, right ventricle (RV), right ventricular myocardium (RVM), ventricular septum (VS), atrial septum (AS), proximal and middle portions of the left anterior descending branch (pmLAD), and proximal portion of the left circumflex coronary branch (pLCX). The changes in each structure with heartbeat were compared among different respiratory states. RESULTS Compared with EIBH, EEBH increased the volume of the heart and its substructures by 0.25-3.66%, while the average Dice similarity coefficient (DSC) increased by - 0.25 to 8.7%; however, the differences were not statistically significant. Conversely, the VS decreased by 0.89 mm in the left-right (LR) direction, and the displacement of the RV in the anterior-posterior (AP) direction significantly decreased by 0.76 mm (p < 0.05). Compared with EIBH and EEBH, the average volume of the heart and its substructures decreased by 3.08-17.57% and 4.09-20.43%, respectively, during DIBH. Accordingly, statistically significant differences (p < 0.05) were observed in the volume of the heart, pericardium, LV, RV, RVM, and AS. The average DSC increased by 0-37.04% and - 2.6 to 32.14%, respectively, with statistically significant differences (p < 0.05) found in the right ventricular myocardium and interatrial septum. Furthermore, the displacements under DIBH decreased in the three directions (i.e.,- 1.73 to 3.47 mm and - 0.36 to 2.51 mm). In this regard, the AP displacement of the heart, LV, RV, RVM, LR direction, LV, RV, and AS showed statistically significant differences (p < 0.05). The Hausdorff distance (HD) of the heart and its substructures under the three breathing states are all greater than 11 mm. CONCLUSION The variations in the displacement and shape alterations of the heart and its substructures during cardiac motion under various respiratory states are significant. When assessing the dose-volume index of the heart and its substructures during radiotherapy for thoracic tumors, it is essential to account for the combined impacts of cardiac motion and respiration.
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Affiliation(s)
- Benzhe Liang
- College of materials science and technology, Nanjing University of Aeronautics and Astronautics, Nanjing, China
- Department of Radiation Oncology Physics and Technology, Shandong Cancer Hospital and Institute, Shandong First Medical University, Shandong Academy of Medical Sciences, Jinan, China
| | - Guanzhong Gong
- Department of Radiation Oncology Physics and Technology, Shandong Cancer Hospital and Institute, Shandong First Medical University, Shandong Academy of Medical Sciences, Jinan, China
| | - Ying Tong
- Department of Radiation Oncology Physics and Technology, Shandong Cancer Hospital and Institute, Shandong First Medical University, Shandong Academy of Medical Sciences, Jinan, China
| | - Lizhen Wang
- Department of Radiation Oncology Physics and Technology, Shandong Cancer Hospital and Institute, Shandong First Medical University, Shandong Academy of Medical Sciences, Jinan, China
| | - Ya Su
- Department of Radiation Oncology Physics and Technology, Shandong Cancer Hospital and Institute, Shandong First Medical University, Shandong Academy of Medical Sciences, Jinan, China
| | - Huadong Wang
- Department of Radiation Oncology Physics and Technology, Shandong Cancer Hospital and Institute, Shandong First Medical University, Shandong Academy of Medical Sciences, Jinan, China
| | - Zhenkai Li
- Department of Radiation Oncology Physics and Technology, Shandong Cancer Hospital and Institute, Shandong First Medical University, Shandong Academy of Medical Sciences, Jinan, China
| | - Hongyu Yan
- Department of Radiation Oncology Physics and Technology, Shandong Cancer Hospital and Institute, Shandong First Medical University, Shandong Academy of Medical Sciences, Jinan, China
| | - Xiaohong Zhang
- College of materials science and technology, Nanjing University of Aeronautics and Astronautics, Nanjing, China.
| | - Yong Yin
- Department of Radiation Oncology Physics and Technology, Shandong Cancer Hospital and Institute, Shandong First Medical University, Shandong Academy of Medical Sciences, Jinan, China.
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Kondaveeti GA, Bhatia VA, Lahm RP, Harris ML, Gaewsky JP, Gayzik FS, Greenhalgh JF, Hamilton CA, Stacey RB, Weaver AA. Quantifying Cardiothoracic Variation with Posture and Respiration to Inform Cardiac Device Design. Cardiovasc Eng Technol 2023; 14:13-24. [PMID: 35618869 PMCID: PMC9699900 DOI: 10.1007/s13239-022-00631-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/04/2021] [Accepted: 05/06/2022] [Indexed: 11/28/2022]
Abstract
PURPOSE With extravascular implantable cardioverter defibrillator leads placed beneath the sternum, it is important to quantify heart motion relative to the rib cage with postural changes and respiration. METHODS MRI scans from five males and five females were collected in upright and supine postures at end inspiration [n = 10 each]. Left and right decubitus [n = 8 each] and prone [n = 5] MRIs at end inspiration and supine MRIs at end expiration [n = 5] were collected on a subset. Four cardiothoracic measurements, six cardiac measurements, and six cardiac landmarks were collected to measure changes across different postures and stages of respiration. RESULTS The relative location of the LV apex to the nearest intercostal space was significantly different between the supine and decubitus postures (average ± SD difference: - 15.7 ± 11.4 mm; p < 0.05). The heart centroid to xipho-sternal junction distance was 9.7 ± 7.9 mm greater in the supine posture when compared to the upright posture (p < 0.05). Cardiac landmark motion in the lateral direction was largest due to postural movement (range 23-50 mm) from the left decubitus to the right decubitus posture, and less influenced by respiration (5-17 mm). Caudal-cranial displacement was generally larger due to upright posture (13-23 mm caudal) and inspiration (7-20 mm cranial). CONCLUSIONS This study demonstrates that the location of the heart with respect to the rib cage varies with posture and respiration. The gravitational effects of postural shifts on the heart position are roughly 2-3 times larger than the effects of normal respiration.
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Affiliation(s)
- Geeth A Kondaveeti
- Department of Biomedical Engineering, Wake Forest School of Medicine, 575 N. Patterson Ave. Suite 530, Winston-Salem, NC, 27101, USA
| | - Varun A Bhatia
- Cardiac Rhythm Management, Medtronic Inc., 8200 Coral Sea Street NE, Mounds View, MN, 55112, USA
| | - Ryan P Lahm
- Cardiac Rhythm Management, Medtronic Inc., 8200 Coral Sea Street NE, Mounds View, MN, 55112, USA
| | - Megan L Harris
- Cardiac Rhythm Management, Medtronic Inc., 8200 Coral Sea Street NE, Mounds View, MN, 55112, USA
| | - James P Gaewsky
- Department of Biomedical Engineering, Wake Forest School of Medicine, 575 N. Patterson Ave. Suite 530, Winston-Salem, NC, 27101, USA
- Elemance LLC, 3540 Clemmons Rd #127, Clemmons, NC, 27012, USA
| | - F Scott Gayzik
- Department of Biomedical Engineering, Wake Forest School of Medicine, 575 N. Patterson Ave. Suite 530, Winston-Salem, NC, 27101, USA
| | | | - Craig A Hamilton
- Department of Biomedical Engineering, Wake Forest School of Medicine, 575 N. Patterson Ave. Suite 530, Winston-Salem, NC, 27101, USA
| | - R Brandon Stacey
- Department of Cardiology, Wake Forest University School of Medicine, Winston-Salem, NC, 27157, USA
| | - Ashley A Weaver
- Department of Biomedical Engineering, Wake Forest School of Medicine, 575 N. Patterson Ave. Suite 530, Winston-Salem, NC, 27101, USA.
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Xu Y, Hrybouski S, Paterson DI, Li Z, Lan Y, Luo L, Shen X, Xu L. Comparison of epicardial adipose tissue volume quantification between ECG-gated cardiac and non-ECG-gated chest computed tomography scans. BMC Cardiovasc Disord 2022; 22:545. [PMID: 36513994 PMCID: PMC9746017 DOI: 10.1186/s12872-022-02958-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2022] [Accepted: 10/04/2022] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND This study investigated accuracy and consistency of epicardial adipose tissue (EAT) quantification in non-ECG-gated chest computed tomography (CT) scans. METHODS EAT volume was semi-automatically quantified using a standard Hounsfield unit threshold (- 190, - 30) in three independent cohorts: (1) Cohort 1 (N = 49): paired 120 kVp ECG-gated cardiac non-contrast CT (NCCT) and 120 kVp non-ECG-gated chest NCCT; (2) Cohort 2 (N = 34): paired 120 kVp cardiac NCCT and 100 kVp non-ECG-gated chest NCCT; (3) Cohort 3 (N = 32): paired non-ECG-gated chest NCCT and chest contrast-enhanced CT (CECT) datasets (including arterial phase and venous phase). Images were reconstructed with the slice thicknesses of 1.25 mm and 5 mm in the chest CT datasets, and 3 mm in the cardiac NCCT datasets. RESULTS In Cohort 1, the chest NCCT-1.25 mm EAT volume was similar to the cardiac NCCT EAT volume, while chest NCCT-5 mm underestimated the EAT volume by 7.5%. In Cohort 2, 100 kVp chest NCCT-1.25 mm were 13.2% larger than 120 kVp cardiac NCCT EAT volumes. In Cohort 3, the chest arterial CECT and venous CECT dataset underestimated EAT volumes by ~ 28% and ~ 18%, relative to chest NCCT datasets. All chest CT-derived EAT volumes were similarly associated with significant coronary atherosclerosis with cardiac CT counterparts. CONCLUSION The 120 kVp non-ECG-gated chest NCCT-1.25 mm images produced EAT volumes comparable to cardiac NCCT. Chest CT EAT volumes derived from consistent imaging settings are excellent alternatives to the cardiac NCCT to investigate their association with coronary artery disease.
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Affiliation(s)
- Yuancheng Xu
- Department of Urology, The University of Hong Kong-Shenzhen Hospital, Shenzhen, Guangdong, China
| | - Stanislau Hrybouski
- Neuroscience and Mental Health Institute, University of Alberta, Edmonton, Alberta, Canada
| | - D. Ian Paterson
- Department of Cardiology, Mackenzie Health Science Centre, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada
| | - Zhiyang Li
- Department of General Surgery, the Second Affiliated Hospital of Shantou University Medical College, Shantou, Guangdong, China
| | - Yulong Lan
- Department of Cardiology, the Second Affiliated Hospital of Shantou University Medical College, Shantou, Guangdong, China
| | - Lin Luo
- Department of Radiology, The University of Hong Kong-Shenzhen Hospital, Shenzhen, Guangdong, China
| | - Xinping Shen
- Department of Radiology, The University of Hong Kong-Shenzhen Hospital, Shenzhen, Guangdong, China
| | - Lingyu Xu
- Department of Cardiology, Mackenzie Health Science Centre, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada
- University of Alberta, 2C2, Mackenzie Health Science Centre, 8440 - 112 St, Edmonton, Alberta, T6G 2B7, Canada
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Weizman N, Baidun K, Goldstein A, Amit U, Saad A, Lawrence YR, Appel S, Orion I, Alezra D, Abrams R, Symon Z, Goldstein J. Initial estimates of continuous positive airway pressure (CPAP) on heart volume, position and motion in patients receiving chest radiation. Med Dosim 2022; 47:191-196. [DOI: 10.1016/j.meddos.2022.02.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2021] [Revised: 01/10/2022] [Accepted: 02/04/2022] [Indexed: 12/25/2022]
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Knybel L, Cvek J, Neuwirth R, Jiravsky O, Hecko J, Penhaker M, Sramko M, Kautzner J. Real-time measurement of ICD lead motion during stereotactic body radiotherapy of ventricular tachycardia. ACTA ACUST UNITED AC 2021; 26:128-137. [PMID: 34046223 DOI: 10.5603/rpor.a2021.0020] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2020] [Accepted: 12/18/2020] [Indexed: 11/25/2022]
Abstract
Background Here we aimed to evaluate the respiratory and cardiac-induced motion of a ICD lead used as surrogate in the heart during stereotactic body radiotherapy (SBRT) of ventricular tachycardia (VT). Data provides insight regarding motion and motion variations during treatment. Materials and methods We analyzed the log files of surrogate motion during SBRT of ventricular tachycardia performed in 20 patients. Evaluated parameters included the ICD lead motion amplitudes; intrafraction amplitude variability; correlation error between the ICD lead and external markers; and margin expansion in the superior-inferior (SI), latero-lateral (LL), and anterior-posterior (AP) directions to cover 90% or 95% of all amplitudes. Results In the SI, LL, and AP directions, respectively, the mean motion amplitudes were 5.0 ± 2.6, 3.4. ± 1.9, and 3.1 ± 1.6 mm. The mean intrafraction amplitude variability was 2.6 ± 0.9, 1.9 ± 1.3, and 1.6 ± 0.8 mm in the SI, LL, and AP directions, respectively. The margins required to cover 95% of ICD lead motion amplitudes were 9.5, 6.7, and 5.5 mm in the SI, LL, and AP directions, respectively. The mean correlation error was 2.2 ± 0.9 mm. Conclusions Data from online tracking indicated motion irregularities and correlation errors, necessitating an increased CTV-PTV margin of 3 mm. In 35% of cases, the motion variability exceeded 3 mm in one or more directions. We recommend verifying the correlation between CTV and surrogate individually for every patient, especially for targets with posterobasal localization where we observed the highest difference between the lead and CTV motion.
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Affiliation(s)
- Lukas Knybel
- Department of Oncology, University Hospital Ostrava, Ostrava, Czech Republic
| | - Jakub Cvek
- Department of Oncology, University Hospital Ostrava, Ostrava, Czech Republic
| | | | - Otakar Jiravsky
- Department of Cardiology, Podlesi Hospital, Trinec, Czech Republic
| | - Jan Hecko
- VŠB-Technical University of Ostrava, Ostrava, Czech Republic
| | - Marek Penhaker
- VŠB-Technical University of Ostrava, Ostrava, Czech Republic
| | - Marek Sramko
- Institute for Clinical and Experimental Medicine, Prague, Czech Republic
| | - Josef Kautzner
- Institute for Clinical and Experimental Medicine, Prague, Czech Republic
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Klaassen L, Petoukhova AL, Habraken SJM, Jacobs J, Sattler MGA, Verhoeven K, Klaver YLB. Effect of breathing motion on robustness of proton therapy plans for left-sided breast cancer patients with indication for locoregional irradiation. Acta Oncol 2021; 60:222-228. [PMID: 33269958 DOI: 10.1080/0284186x.2020.1825800] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
PURPOSE To investigate the dosimetric impact of breathing motion on robustly optimized proton therapy treatment plans for left-sided breast cancer patients with an indication for locoregional irradiation. MATERIALS AND METHODS Clinical Target Volumes (CTVs) (left-sided breast, level 1 to 4 axillary lymph nodes, interpectoral and internal mammary lymph node regions) and organs at risk were delineated on 4 D-CTs of ten female patients. After treatment planning to a prescribed dose of 40.05 Gy(RBE) in 15 fractions on the time-averaged CT, the dose was calculated on all ten phases of the breathing cycle. Robustness to setup (5 mm) and range errors (3%) was evaluated for those ten phases. Correlations were evaluated between the phases of the breathing cycle and the D98% of the CTV and the Dmean of the heart. RESULTS Correlations coefficients were between -0.12 and 0.29. At the most extreme values of the 28 robustness scenarios, the clinical goals were met for all but two patients. The mean heart dose was 0.41 Gy(RBE) with a standard deviation of 0.31 Gy(RBE) of proton therapy plans. CONCLUSION The effect of breathing motion on the robustness of proton therapy treatment plans for this patient group is minor and not of clinical significance. Based on this patient group, a deep-inspiration breath hold seems to be unnecessary to improve robustness for these patients.
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Affiliation(s)
- L. Klaassen
- HollandPTC, The Netherlands
- Faculty of Mechanical, Maritime and Materials Engineering, Delft University of Technology, Delft, The Netherlands
| | - A. L. Petoukhova
- HollandPTC, The Netherlands
- Haaglanden Medical Center, Department of Medical Physics, Burgemeester Banninglaan 1, Leidschendam, BA, The Netherlands
| | - S. J. M. Habraken
- HollandPTC, The Netherlands
- Department of Radiation Oncology, Erasmus MC Cancer Institute, Rotterdam, The Netherlands
| | | | - M. G. A. Sattler
- HollandPTC, The Netherlands
- Department of Radiation Oncology, Erasmus MC Cancer Institute, Rotterdam, The Netherlands
| | - K. Verhoeven
- Department of Radiation Oncology, MAASTRO, Maastricht, The Netherlands
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Yan R, Chu FI, Gao Y, Yu V, Yoon S, Elashoff D, Lee P, Hu P, Yang Y. Dosimetric impact from cardiac motion to heart substructures in thoracic cancer patients treated with a magnetic resonance guided radiotherapy system. PHYSICS & IMAGING IN RADIATION ONCOLOGY 2020; 17:8-12. [PMID: 33898771 PMCID: PMC8057956 DOI: 10.1016/j.phro.2020.11.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/15/2020] [Revised: 11/24/2020] [Accepted: 11/25/2020] [Indexed: 11/03/2022]
Abstract
Few studies have examined the cardiac volume and radiation dose differences among cardiac phases during radiation therapy (RT). Such information is crucial to dose reconstruction and understanding of RT related cardiac toxicity. In a cohort of nine patients, we studied the changes in the volume and doses of several cardiac substructures between the end-diastolic and end-systolic phases based on the clinical magnetic resonance-guided RT (MRgRT) treatment plans. Significant differences in the volume and dose between the two phases were observed. Onboard cardiac cine MRI holds promise for patient-specific cardiac sparing treatment designs.
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Affiliation(s)
- Ran Yan
- Department of Radiological Sciences, David Geffen School of Medicine, University of California, Los Angeles, CA, USA.,Department of Bioengineering, University of California, Los Angeles, CA, USA
| | - Fang-I Chu
- Department of Radiation Oncology, University of California, Los Angeles, CA, USA
| | - Yu Gao
- Department of Radiological Sciences, David Geffen School of Medicine, University of California, Los Angeles, CA, USA
| | - Victoria Yu
- Department of Radiological Sciences, David Geffen School of Medicine, University of California, Los Angeles, CA, USA
| | - Stephanie Yoon
- Department of Radiation Oncology, University of California, Los Angeles, CA, USA
| | - David Elashoff
- Department of Biostatistics, University of California, Los Angeles, CA, USA
| | - Percy Lee
- Department of Radiation Oncology, MD Anderson Cancer Center, Houston, TX, USA
| | - Peng Hu
- Department of Radiological Sciences, David Geffen School of Medicine, University of California, Los Angeles, CA, USA
| | - Yingli Yang
- Department of Radiation Oncology, University of California, Los Angeles, CA, USA
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Chiu MH, Mitchell LB, Ploquin N, Faruqi S, Kuriachan VP. Review of Stereotactic Arrhythmia Radioablation Therapy for Cardiac Tachydysrhythmias. CJC Open 2020; 3:236-247. [PMID: 33778440 PMCID: PMC7984992 DOI: 10.1016/j.cjco.2020.11.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Accepted: 11/06/2020] [Indexed: 12/04/2022] Open
Abstract
Cardiac tachyarrhythmias are a major cause of morbidity and mortality. Treatments for these tachyarrhythmias include antiarrhythmic drugs, catheter ablation, surgical ablation, cardiac implantable electronic devices, and cardiac transplantation. Each of these treatment approaches is effective in some patients but there is considerable room for improvement, particularly with respect to the most common of the tachydysrhythmias, atrial fibrillation, and the most dangerous of the tachydysrhythmias, ventricular tachycardia (VT) or ventricular fibrillation. Noninvasive stereotactic ablative radiation therapy is emerging as an effective treatment for refractory tachyarrhythmias. Animal models have shown successful ablation of arrhythmogenic myocardial substrates with minimal short-term complications. Studies of stereotactic radioablation involving patients with refractory VT have shown a reduction in VT recurrence and promising early safety data. In this review, we provide the background for the application of stereotactic arrhythmia radioablation therapy along with promising results from early applications of the technology.
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Affiliation(s)
- Michael H Chiu
- Libin Cardiovascular Institute of Alberta, Department of Cardiac Sciences, University of Calgary and Alberta Health Services, Calgary, Alberta, Canada
| | - L Brent Mitchell
- Libin Cardiovascular Institute of Alberta, Department of Cardiac Sciences, University of Calgary and Alberta Health Services, Calgary, Alberta, Canada
| | - Nicolas Ploquin
- Libin Cardiovascular Institute of Alberta, Department of Cardiac Sciences, University of Calgary and Alberta Health Services, Calgary, Alberta, Canada
| | - Salman Faruqi
- Libin Cardiovascular Institute of Alberta, Department of Cardiac Sciences, University of Calgary and Alberta Health Services, Calgary, Alberta, Canada
| | - Vikas P Kuriachan
- Libin Cardiovascular Institute of Alberta, Department of Cardiac Sciences, University of Calgary and Alberta Health Services, Calgary, Alberta, Canada
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Wei C, Qian P, Tedrow U, Mak R, Zei PC. Non-invasive Stereotactic Radioablation: A New Option for the Treatment of Ventricular Arrhythmias. Arrhythm Electrophysiol Rev 2020; 8:285-293. [PMID: 32685159 PMCID: PMC7358955 DOI: 10.15420/aer.2019.04] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
Ventricular tachycardia (VT) is associated with significant morbidity and mortality. Radiofrequency catheter ablation can be effective for the treatment of VT but it carries a high rate of recurrence often attributable to insufficient depth of penetration for reaching critical arrhythmogenic substrates. Stereotactic body radioablation (SBRT) is a commonly used technology developed for the non-invasive treatment of solid tumours. Recent evidence suggests that it can also be effective for the treatment of VT. It is a non-invasive procedure and it has the unique advantage of delivering ablative energy to any desired volume within the body to reach sites that are inaccessible with catheter ablation. This article summarises the pre-clinical studies that have formed the evidence base for SBRT in the heart, describes the clinical approaches for SBRT VT ablation and provides perspective on next steps for this new treatment modality.
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Affiliation(s)
- Chen Wei
- Harvard Medical School, Boston, MA, US.,Division of Cardiovascular Medicine, Brigham and Women's Hospital, Boston, MA, US
| | - Pierre Qian
- Division of Cardiovascular Medicine, Brigham and Women's Hospital, Boston, MA, US
| | - Usha Tedrow
- Division of Cardiovascular Medicine, Brigham and Women's Hospital, Boston, MA, US
| | - Raymond Mak
- Department of Radiation Oncology, Brigham and Women's Hospital/Dana-Farber Cancer Institute, Boston, MA, US
| | - Paul C Zei
- Division of Cardiovascular Medicine, Brigham and Women's Hospital, Boston, MA, US
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Tong Y, Gong G, Su M, Yin Y. Comparison of the dose on specific 3DCT images and the accumulated dose for cardiac structures in esophageal tumors radiotherapy: whether specific 3DCT images can be used for dose assessment? Radiat Oncol 2019; 14:242. [PMID: 31881901 PMCID: PMC6935068 DOI: 10.1186/s13014-019-1450-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2019] [Accepted: 12/19/2019] [Indexed: 01/23/2023] Open
Abstract
BACKGROUND Cardiac activity could impact the accuracy of dose assessment for the heart, pericardium and left ventricular myocardium (LVM). The purpose of this study was to explore whether it is possible to perform dose assessment by contouring the cardiac structures on specific three-dimensional computed tomography (3DCT) images to reduce the impact of cardiac activity. METHODS Electrocardiograph-gated 4DCT (ECG-gated 4DCT) images of 22 patients in breath-hold were collected. MIM Maestro 6.8.2 (MIM) was used to reconstruct specific 3DCT images to obtain the Maximal intensity projection (MIP) image, Average intensity projection (AIP) image and Minimum intensity projection (Min-IP) image. The heart, pericardium and LVM were contoured in 20 phases of 4DCT images (0, 5%... 95%) and the MIP, AIP and Min-IP images. Then, a radiotherapy plan was designed at the 0% phase of the 4DCT images, and the dose was transplanted to all phases of 4DCT to acquire the dose on all phases, the accumulated dose of all phases was calculated using MIM. The dose on MIP, AIP and Min-IP images were also obtained by deformable registration of the dose. The mean dose (Dmean), V5, V10, V20, V30 and V40 for the heart, pericardium and LVM in MIP, AIP and Min-IP images were compared with the corresponding parameters after dose accumulation. RESULTS The mean values of the difference between the Dmean in the MIP image and the Dmean after accumulation for the heart, pericardium and LVM were all less than 1.50 Gy, and the dose difference for the pericardium and LVM was not statistically significant (p > 0.05). For dose-volume parameters, there was no statistically significant difference between V5, V10, and V20 of the heart and pericardium in MIP, AIP, and Min-IP images and those after accumulation (p > 0.05). For the LVM, only in the MIP image, the differences of V5, V10, V20, V30 and V40 were not significant compared to those after dose accumulation (p > 0.05). CONCLUSIONS There was a smallest difference for the dosimetry parameters of cardiac structures on MIP image compared to corresponding parameters after dose accumulation. Therefore, it is recommended to use the MIP image for the delineation and dose assessment of cardiac structures in clinical practice.
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Affiliation(s)
- Ying Tong
- Shandong Cancer Hospital and Institute, Shandong First Medical University and Shandong Academy of Medical Sciences, Jinan, China
| | - Guanzhong Gong
- Shandong Cancer Hospital and Institute, Shandong First Medical University and Shandong Academy of Medical Sciences, Jinan, China
| | - Ming Su
- School of Nuclear Science and Technology, University of South China, Hengyang, China
| | - Yong Yin
- Shandong Cancer Hospital and Institute, Shandong First Medical University and Shandong Academy of Medical Sciences, Jinan, China.
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Sharp AJ, Mak R, Zei PC. Noninvasive Cardiac Radioablation for Ventricular Arrhythmias. CURRENT CARDIOVASCULAR RISK REPORTS 2019. [DOI: 10.1007/s12170-019-0596-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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