An empirical model for calculation of the collimator contamination dose in therapeutic proton beams
| العنوان: | An empirical model for calculation of the collimator contamination dose in therapeutic proton beams |
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| المؤلفون: | Régis Ferrand, Nicolas Freud, L Guinement, L. De Marzi, Catherine Nauraye, M. Vidal, P François, E. Hierso, David Sarrut, H. Szymanowski |
| المساهمون: | DOSIsoft, Centre de prothonthérapie d'Orsay Institut Curie, Institut Curie [Paris], Deutsches Krebsforschungszentrum Heidelberg, Physikalisch-Technische Bundesanstalt [Braunschweig] (PTB), Imagerie Tomographique et Radiothérapie, Centre de Recherche en Acquisition et Traitement de l'Image pour la Santé (CREATIS), Université Jean Monnet [Saint-Étienne] (UJM)-Hospices Civils de Lyon (HCL)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université Jean Monnet [Saint-Étienne] (UJM)-Hospices Civils de Lyon (HCL)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Santé et de la Recherche Médicale (INSERM), Centre Léon Bérard [Lyon] |
| المصدر: | Physics in Medicine and Biology Physics in Medicine and Biology, IOP Publishing, 2016, 61, pp.1532-1545. ⟨10.1088/0031-9155/61/4/1532⟩ |
| بيانات النشر: | IOP Publishing, 2016. |
| سنة النشر: | 2016 |
| مصطلحات موضوعية: | Proton, Aperture, Physics::Medical Physics, Monte Carlo method, dose calculation, 030218 nuclear medicine & medical imaging, law.invention, 03 medical and health sciences, 0302 clinical medicine, Optics, law, [INFO.INFO-IM]Computer Science [cs]/Medical Imaging, Proton Therapy, Humans, Scattering, Radiation, Radiology, Nuclear Medicine and imaging, Proton therapy, Physics, Radiological and Ultrasound Technology, Scattering, business.industry, Radiotherapy Planning, Computer-Assisted, Radiotherapy Dosage, Collimator, Beamline, collimator scatter, 030220 oncology & carcinogenesis, [PHYS.PHYS.PHYS-MED-PH]Physics [physics]/Physics [physics]/Medical Physics [physics.med-ph], Physics::Accelerator Physics, Protons, business, Algorithms, Beam (structure) |
| الوصف: | International audience; Collimators are used as lateral beam shaping devices in proton therapy with passive scattering beam lines. The dose contamination due to collimator scattering can be as high as 10% of the maximum dose and influences calculation of the output factor or monitor units (MU). To date, commercial treatment planning systems generally use a zero-thickness collimator approximation ignoring edge scattering in the aperture collimator and few analytical models have been proposed to take scattering effects into account, mainly limited to the inner collimator face component. The aim of this study was to characterize and model aperture contamination by means of a fast and accurate analytical model. The entrance face collimator scatter distribution was modeled as a 3D secondary dose source. Predicted dose contaminations were compared to measurements and Monte Carlo simulations. Measurements were performed on two different proton beam lines (a fixed horizontal beam line and a gantry beam line) with divergent apertures and for several field sizes and energies. Discrepancies between analytical algorithm dose prediction and measurements were decreased from 10% to 2% using the proposed model. Gamma-index (2%/1 mm) was respected for more than 90% of pixels. The proposed analytical algorithm increases the accuracy of analytical dose calculations with reasonable computation times. |
| تدمد: | 1361-6560 0031-9155 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b72565d536b5471fd40128d03e5be602Test https://doi.org/10.1088/0031-9155/61/4/1532Test |
| حقوق: | CLOSED |
| رقم الانضمام: | edsair.doi.dedup.....b72565d536b5471fd40128d03e5be602 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 13616560 00319155 |
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