101
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Santos AMC, Mohammadi M, Afshar V. S. Evaluation of a real‐time BeO ceramic fiber‐coupled luminescence dosimetry system for dose verification of high dose rate brachytherapy. Med Phys 2015; 42:6349-56. [DOI: 10.1118/1.4931968] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Affiliation(s)
- Alexandre M. Caraça Santos
- Department of Medical Physics, Royal Adelaide Hospital, Adelaide 5000, Australia and Institute for Photonics and Advanced Sensing, School of Physical Sciences, University of Adelaide, Adelaide 5005, Australia
| | - Mohammad Mohammadi
- Department of Medical Physics, Royal Adelaide Hospital, Adelaide 5000, Australia and Department of Medical Physics, Faculty of Medicine, Hamadan University of Medical Sciences, Hamadan 65167‐3‐8736, Iran
| | - Shahraam Afshar V.
- Laser Physics and Photonic Devices Laboratories, School of Engineering, The University of South Australia, Adelaide 5095, Australia and Institute for Photonics and Advanced Sensing, School of Physical Sciences, University of Adelaide, Adelaide 5005, Australia
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102
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Espinoza A, Petasecca M, Cutajar D, Fuduli I, Howie A, Bucci J, Corde S, Jackson M, Zaider M, Lerch MLF, Rosenfeld AB. Pretreatment verification of high dose rate brachytherapy plans using the ‘magic phantom’ system. Biomed Phys Eng Express 2015. [DOI: 10.1088/2057-1976/1/2/025201] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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103
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Adlienė D, Jakštas K, Urbonavičius BG. In vivo TLD dose measurements in catheter-based high-dose-rate brachytherapy. RADIATION PROTECTION DOSIMETRY 2015; 165:477-481. [PMID: 25809111 DOI: 10.1093/rpd/ncv054] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Routine in vivo dosimetry is well established in external beam radiotherapy; however, it is restricted mainly to detection of gross errors in high-dose-rate (HDR) brachytherapy due to complicated measurements in the field of steep dose gradients in the vicinity of radioactive source and high uncertainties. The results of in vivo dose measurements using TLD 100 mini rods and TLD 'pin worms' in catheter-based HDR brachytherapy are provided in this paper alongside with their comparison with corresponding dose values obtained using calculation algorithm of the treatment planning system. Possibility to perform independent verification of treatment delivery in HDR brachytherapy using TLDs is discussed.
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Affiliation(s)
- Diana Adlienė
- Physics Department, Kaunas University of Technology, Studentų g. 50, LT-51368 Kaunas, Lithuania
| | - Karolis Jakštas
- Šiauliai County Hospital, V.Kudirkos g. 99, LT-76231 Šiauliai, Lithuania
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104
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O'Keeffe S, McCarthy D, Woulfe P, Grattan MWD, Hounsell AR, Sporea D, Mihai L, Vata I, Leen G, Lewis E. A review of recent advances in optical fibre sensors for in vivo dosimetry during radiotherapy. Br J Radiol 2015; 88:20140702. [PMID: 25761212 PMCID: PMC4628446 DOI: 10.1259/bjr.20140702] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2014] [Revised: 02/19/2015] [Accepted: 03/10/2015] [Indexed: 11/05/2022] Open
Abstract
This article presents an overview of the recent developments and requirements in radiotherapy dosimetry, with particular emphasis on the development of optical fibre dosemeters for radiotherapy applications, focusing particularly on in vivo applications. Optical fibres offer considerable advantages over conventional techniques for radiotherapy dosimetry, owing to their small size, immunity to electromagnetic interferences, and suitability for remote monitoring and multiplexing. The small dimensions of optical fibre-based dosemeters, together with being lightweight and flexible, mean that they are minimally invasive and thus particularly suited to in vivo dosimetry. This means that the sensor can be placed directly inside a patient, for example, for brachytherapy treatments, the optical fibres could be placed in the tumour itself or into nearby critical tissues requiring monitoring, via the same applicators or needles used for the treatment delivery thereby providing real-time dosimetric information. The article outlines the principal sensor design systems along with some of the main strengths and weaknesses associated with the development of these techniques. The successful demonstration of these sensors in a range of different clinical environments is also presented.
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Affiliation(s)
- S O'Keeffe
- Optical Fibre Sensors Research Centre, Department of Electronic and Computer Engineering, University of Limerick, Limerick, Ireland
| | - D McCarthy
- Optical Fibre Sensors Research Centre, Department of Electronic and Computer Engineering, University of Limerick, Limerick, Ireland
| | - P Woulfe
- Department of Radiotherapy Physics, Galway Clinic, Galway, Ireland
| | - M W D Grattan
- Radiotherapy Physics, Northern Ireland Cancer Centre, Belfast Health and Social Care Trust, Belfast, UK
| | - A R Hounsell
- Radiotherapy Physics, Northern Ireland Cancer Centre, Belfast Health and Social Care Trust, Belfast, UK
| | - D Sporea
- Laser Metrology Laboratory, National Institute for Laser, Plasma and Radiation Physics, Magurele, Romania
| | - L Mihai
- Laser Metrology Laboratory, National Institute for Laser, Plasma and Radiation Physics, Magurele, Romania
| | - I Vata
- “Horia Hulubei” National Institute of Physics and Nuclear Engineering, Magurele, Romania
| | - G Leen
- Optical Fibre Sensors Research Centre, Department of Electronic and Computer Engineering, University of Limerick, Limerick, Ireland
| | - E Lewis
- Optical Fibre Sensors Research Centre, Department of Electronic and Computer Engineering, University of Limerick, Limerick, Ireland
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105
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Asgharizadeh S, Bekerat H, Syme A, Aldelaijan S, DeBlois F, Vuong T, Evans M, Seuntjens J, Devic S. Radiochromic film-based quality assurance for CT-based high-dose-rate brachytherapy. Brachytherapy 2015; 14:578-85. [PMID: 25865477 DOI: 10.1016/j.brachy.2015.02.192] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2014] [Revised: 01/09/2015] [Accepted: 02/08/2015] [Indexed: 11/29/2022]
Abstract
PURPOSE In the past, film dosimetry was developed into a powerful tool for external beam radiotherapy treatment verification and quality assurance. The objective of this work was the development and clinical testing of the EBT3 model GafChromic film based brachytherapy quality assurance (QA) system. METHODS AND MATERIALS Retrospective dosimetry study was performed to test a patient-specific QA system for preoperative endorectal brachytherapy that uses a radiochromic film dosimetry system. A dedicated phantom for brachytherapy applicator used for rectal cancer treatment was fabricated enabling us to compare calculated-to-measured dose distributions. Starting from the same criteria used for external beam intensity-modulated radiation therapy QA (3%, 3 mm), passing criteria for high- and low-dose gradient regions were subsequently determined. Finally, we investigated the QA system's sensitivity to controlled source positional errors on selected patient plans. RESULTS In low-dose gradient regions, measured dose distributions with criteria of 3%, 3 mm barely passed the test, as they showed 95% passing pixels. However, in the high-dose gradient region, a more stringent condition could be established. Both criteria of 2%, 3 mm and 3%, 2 mm with gamma function calculated using normalization to the same absolute dose value in both measured and calculated dose distributions, and matrix sizes rescaled to match each other showed more than 95% of pixels passing, on average, for 15 patient plans analyzed. CONCLUSIONS Although the necessity of the patient-specific brachytherapy QA needs yet to be justified, we described a radiochromic film dosimetry-based QA system that can be a part of the brachytherapy commissioning process, as well as yearly QA program.
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Affiliation(s)
- Saeid Asgharizadeh
- Medical Physics Unit, McGill University, Montréal, Québec, Canada; Department of Radiation Oncology, Jewish General Hospital, McGill University, Montréal, Québec, Canada
| | - Hamed Bekerat
- Medical Physics Unit, McGill University, Montréal, Québec, Canada; Department of Radiation Oncology, Jewish General Hospital, McGill University, Montréal, Québec, Canada
| | - Alasdair Syme
- Medical Physics Unit, McGill University, Montréal, Québec, Canada; Department of Radiation Oncology, Jewish General Hospital, McGill University, Montréal, Québec, Canada
| | - Saad Aldelaijan
- Medical Physics Unit, McGill University, Montréal, Québec, Canada; Department of Radiation Oncology, Jewish General Hospital, McGill University, Montréal, Québec, Canada
| | - François DeBlois
- Medical Physics Unit, McGill University, Montréal, Québec, Canada; Department of Radiation Oncology, Jewish General Hospital, McGill University, Montréal, Québec, Canada
| | - Té Vuong
- Department of Radiation Oncology, Jewish General Hospital, McGill University, Montréal, Québec, Canada
| | - Michael Evans
- Medical Physics Unit, McGill University, Montréal, Québec, Canada; Department of Medical Physics, McGill University Health Centre, Montréal, Québec, Canada
| | - Jan Seuntjens
- Medical Physics Unit, McGill University, Montréal, Québec, Canada
| | - Slobodan Devic
- Medical Physics Unit, McGill University, Montréal, Québec, Canada; Department of Radiation Oncology, Jewish General Hospital, McGill University, Montréal, Québec, Canada.
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106
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Dosimetry systems based on Gallium Nitride probe for radiotherapy, brachytherapy and interventional radiology. Ing Rech Biomed 2015. [DOI: 10.1016/j.irbm.2015.01.008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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107
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Allison RR, Patel RM, McLawhorn RA. Radiation oncology: physics advances that minimize morbidity. Future Oncol 2014; 10:2329-44. [DOI: 10.2217/fon.14.176] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
ABSTRACT Radiation therapy has become an ever more successful treatment for many cancer patients. This is due in large part from advances in physics including the expanded use of imaging protocols combined with ever more precise therapy devices such as linear and particle beam accelerators, all contributing to treatments with far fewer side effects. This paper will review current state-of-the-art physics maneuvers that minimize morbidity, such as intensity-modulated radiation therapy, volummetric arc therapy, image-guided radiation, radiosurgery and particle beam treatment. We will also highlight future physics enhancements on the horizon such as MRI during treatment and intensity-modulated hadron therapy, all with the continued goal of improved clinical outcomes.
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Affiliation(s)
- Ron R Allison
- 21st Century Oncology, Inc., 801 WH Smith Blvd, Greenville, NC 27858, USA
| | - Rajen M Patel
- 21st Century Oncology, Inc., 801 WH Smith Blvd, Greenville, NC 27858, USA
| | - Robert A McLawhorn
- 21st Century Oncology, Inc., 801 WH Smith Blvd, Greenville, NC 27858, USA
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108
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Comparison of planned and measured rectal dose in-vivo during high dose rate Cobalt-60 brachytherapy of cervical cancer. Phys Med 2014; 30:980-4. [DOI: 10.1016/j.ejmp.2014.07.002] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/10/2013] [Revised: 06/03/2014] [Accepted: 07/13/2014] [Indexed: 11/19/2022] Open
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109
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TRUS-probe integrated MOSkin detectors for rectal wall in vivo dosimetry in HDR brachytherapy: In phantom feasibility study. RADIAT MEAS 2014. [DOI: 10.1016/j.radmeas.2014.05.010] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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110
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111
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Independent brachytherapy plan verification software: Improving efficacy and efficiency. Radiother Oncol 2014; 113:420-4. [DOI: 10.1016/j.radonc.2014.09.015] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2014] [Revised: 09/11/2014] [Accepted: 09/29/2014] [Indexed: 11/20/2022]
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112
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Souris JS, Cheng SH, Pelizzari C, Chen NT, La Riviere P, Chen CT, Lo LW. Radioluminescence characterization of in situ x-ray nanodosimeters: Potential real-time monitors and modulators of external beam radiation therapy. APPLIED PHYSICS LETTERS 2014; 105:203110. [PMID: 25425747 PMCID: PMC4240777 DOI: 10.1063/1.4900962] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2014] [Accepted: 10/22/2014] [Indexed: 05/25/2023]
Abstract
Europium-doped yttrium oxide (Y2O3:Eu) has garnered considerable interest recently for its use as a highly efficient, red phosphor in a variety of lighting applications that include fluorescent lamps, plasma, and field emission display panels, light emitting diodes (LEDs), and lasers. In the present work, we describe the development of Y2O3:Eu nanoparticles for a very different application: in situ, in vivo x-ray dosimetry. Spectroscopic analyses of these nanoparticles during x-ray irradiation reveal surprisingly bright and stable radioluminescence at near-infrared wavelengths, with markedly linear response to changes in x-ray flux and energy. Monte Carlo modeling of incident flux and broadband, wide-field imaging of mouse phantoms bearing both Y2O3:Eu nanoparticles and calibrated LEDs of similar spectral emission demonstrated significant transmission of radioluminescence, in agreement with spectroscopic studies; with approximately 15 visible photons being generated for every x-ray photon incident. Unlike the dosimeters currently employed in clinical practice, these nanodosimeters can sample both dose and dose rate rapidly enough as to provide real-time feedback for x-ray based external beam radiotherapy (EBRT). The technique's use of remote sensing and absence of supporting structures enable perturbation-free dosing of the targeted region and complete sampling from any direction. With the conjugation of pathology-targeting ligands onto their surfaces, these nanodosimeters offer a potential paradigm shift in the real-time monitoring and modulation of delivered dose in the EBRT of cancer in situ.
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Affiliation(s)
- Jeffrey S Souris
- Department of Radiology, The University of Chicago , Chicago, Illinois 60637, USA
| | | | - Charles Pelizzari
- Deaprtment of Radiation and Cellular Oncology, The University of Chicago , Chicago, Illinois 60637, USA
| | | | - Patrick La Riviere
- Department of Radiology, The University of Chicago , Chicago, Illinois 60637, USA
| | - Chin-Tu Chen
- Department of Radiology, The University of Chicago , Chicago, Illinois 60637, USA
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113
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Kertzscher G, Rosenfeld A, Beddar S, Tanderup K, Cygler JE. In vivo dosimetry: trends and prospects for brachytherapy. Br J Radiol 2014; 87:20140206. [PMID: 25007037 DOI: 10.1259/bjr.20140206] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
The error types during brachytherapy (BT) treatments and their occurrence rates are not well known. The limited knowledge is partly attributed to the lack of independent verification systems of the treatment progression in the clinical workflow routine. Within the field of in vivo dosimetry (IVD), it is established that real-time IVD can provide efficient error detection and treatment verification. However, it is also recognized that widespread implementations are hampered by the lack of available high-accuracy IVD systems that are straightforward for the clinical staff to use. This article highlights the capabilities of the state-of-the-art IVD technology in the context of error detection and quality assurance (QA) and discusses related prospects of the latest developments within the field. The article emphasizes the main challenges responsible for the limited practice of IVD and provides descriptions on how they can be overcome. Finally, the article suggests a framework for collaborations between BT clinics that implemented IVD on a routine basis and postulates that such collaborations could improve BT QA measures and the knowledge about BT error types and their occurrence rates.
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Affiliation(s)
- G Kertzscher
- 1 Centre for Nuclear Technologies, Technical University of Denmark, Roskilde, Denmark
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114
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Manning S, Nyathi T. An investigation into the accuracy of Acuros(TM) BV in heterogeneous phantoms for a (192)Ir HDR source using LiF TLDs. AUSTRALASIAN PHYSICAL & ENGINEERING SCIENCES IN MEDICINE 2014; 37:505-14. [PMID: 24866931 DOI: 10.1007/s13246-014-0279-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2013] [Accepted: 05/09/2014] [Indexed: 10/25/2022]
Abstract
The aim of this study was to evaluate the accuracy of the new Acuros(TM) BV algorithm using well characterized LiF:Mg,Ti TLD 100 in heterogeneous phantoms. TLDs were calibrated using an (192)Ir source and the AAPM TG-43 calculated dose. The Tölli and Johansson Large Cavity principle and Modified Bragg Gray principle methods confirm the dose calculated by TG-43 at a distance of 5 cm from the source to within 4 %. These calibrated TLDs were used to measure the dose in heterogeneous phantoms containing air, stainless steel, bone and titanium. The TLD results were compared with the AAPM TG-43 calculated dose and the Acuros calculated dose. Previous studies by other authors have shown a change in TLD response with depth when irradiated with an (192)Ir source. This TLD depth dependence was assessed by performing measurements at different depths in a water phantom with an (192)Ir source. The variation in the TLD response with depth in a water phantom was not found to be statistically significant for the distances investigated. The TLDs agreed with Acuros(TM) BV within 1.4 % in the air phantom, 3.2 % in the stainless steel phantom, 3 % in the bone phantom and 5.1 % in the titanium phantom. The TLDs showed a larger discrepancy when compared to TG-43 with a maximum deviation of 9.3 % in the air phantom, -11.1 % in the stainless steel phantom, -14.6 % in the bone phantom and -24.6 % in the titanium phantom. The results have shown that Acuros accounts for the heterogeneities investigated with a maximum deviation of -5.1 %. The uncertainty associated with the TLDs calibrated in the PMMA phantom is ±8.2 % (2SD).
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Affiliation(s)
- Siobhan Manning
- Department of Medical Physics, Waikato District Health Board, Pembroke Street, Hamilton, New Zealand,
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115
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Kertzscher G, Andersen CE, Tanderup K. Adaptive error detection for HDR/PDR brachytherapy: Guidance for decision making during real-time in vivo
point dosimetry. Med Phys 2014; 41:052102. [DOI: 10.1118/1.4870438] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
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116
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Wootton L, Kudchadker R, Lee A, Beddar S. Real-time in vivo rectal wall dosimetry using plastic scintillation detectors for patients with prostate cancer. Phys Med Biol 2014; 59:647-60. [PMID: 24434775 DOI: 10.1088/0031-9155/59/3/647] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
We designed and constructed an in vivo dosimetry system using plastic scintillation detectors (PSDs) to monitor dose to the rectal wall in patients undergoing intensity-modulated radiation therapy for prostate cancer. Five patients were enrolled in an Institutional Review Board-approved protocol for twice weekly in vivo dose monitoring with our system, resulting in a total of 142 in vivo dose measurements. PSDs were attached to the surface of endorectal balloons used for prostate immobilization to place the PSDs in contact with the rectal wall. Absorbed dose was measured in real time and the total measured dose was compared with the dose calculated by the treatment planning system on the daily computed tomographic image dataset. The mean difference between measured and calculated doses for the entire patient population was -0.4% (standard deviation 2.8%). The mean difference between daily measured and calculated doses for each patient ranged from -3.3% to 3.3% (standard deviation ranged from 5.6% to 7.1% for four patients and was 14.0% for the last, for whom optimal positioning of the detector was difficult owing to the patient's large size). Patients tolerated the detectors well and the treatment workflow was not compromised. Overall, PSDs performed well as in vivo dosimeters, providing excellent accuracy, real-time measurement and reusability.
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Affiliation(s)
- Landon Wootton
- Department of Radiation Physics, The University of Texas M D Anderson Cancer Center, 1515 Holcombe Blvd, Houston, TX, USA
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