Search

Your search keyword '"Godart, Jeremy"' showing total 22 results
Start Over Author "Godart, Jeremy"
22 results on '"Godart, Jeremy"'

9. Multi‐institutional consensus on machine QA for isochronous cyclotron‐based systems delivering ultra‐high dose rate (FLASH) pencil beam scanning proton therapy in transmission mode.

Author

Spruijt, Kees, Mossahebi, Sina, Lin, Haibo, Lee, Eunsin, Kraus, James, Dhabaan, Anees, Poulsen, Per, Lowe, Matthew, Ayan, Ahmet, Spiessens, Sylvie, Godart, Jeremy, and Hoogeman, Mischa

Subjects
PROTON beams, PROTON therapy, QUALITY assurance standards, MACHINERY
Abstract

Background: The first clinical trials to assess the feasibility of FLASH radiotherapy in humans have started (FAST‐01, FAST‐02) and more trials are foreseen. To increase comparability between trials it is important to assure treatment quality and therefore establish a standard for machine quality assurance (QA). Currently, the AAPM TG‐224 report is considered as the standard on machine QA for proton therapy, however, it was not intended to be used for ultra‐high dose rate (UHDR) proton beams, which have gained interest due to the observation of the FLASH effect. Purpose: The aim of this study is to find consensus on practical guidelines on machine QA for UHDR proton beams in transmission mode in terms of which QA is required, how they should be done, which detectors are suitable for UHDR machine QA, and what tolerance limits should be applied. Methods: A risk assessment to determine the gaps in the current standard for machine QA was performed by an international group of medical physicists. Based on that, practical guidelines on how to perform machine QA for UHDR proton beams were proposed. Results: The risk assessment clearly identified the need for additional guidance on temporal dosimetry, addressing dose rate (constancy), dose spillage, and scanning speed. In addition, several minor changes from AAPM TG‐224 were identified; define required dose rate levels, the use of clinically relevant dose levels, and the use of adapted beam settings to minimize activation of detector and phantom materials or to avoid saturation effects of specific detectors. The final report was created based on discussions and consensus. Conclusions: Consensus was reached on what QA is required for UHDR scanning proton beams in transmission mode for isochronous cyclotron‐based systems and how they should be performed. However, the group discussions also showed that there is a lack of high temporal resolution detectors and sufficient QA data to set appropriate limits for some of the proposed QA procedures. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

15. Additional file 1: of A randomized controlled trial testing a hyaluronic acid spacer injection for skin toxicity reduction of brachytherapy accelerated partial breast irradiation (APBI): a study protocol

Author

Struik, Gerson, Godart, Jeremy, Verduijn, Gerda, Inger-Karine Kolkman-Deurloo, Vries, Kim De, Boer, Raymond De, Linetta Koppert, Birnie, Erwin, Ghandi, Ali, Klem, Taco, and Jean-Philippe Pignol

Abstract

SPIRIT 2013 checklist. Recommended items to address in a clinical trial protocol and related documents. (PDF 117 kb)

Published
2018
Full Text
View/download PDF

16. Additional file 2: of A randomized controlled trial testing a hyaluronic acid spacer injection for skin toxicity reduction of brachytherapy accelerated partial breast irradiation (APBI): a study protocol

Author

Struik, Gerson, Godart, Jeremy, Verduijn, Gerda, Inger-Karine Kolkman-Deurloo, Vries, Kim De, Boer, Raymond De, Linetta Koppert, Birnie, Erwin, Ghandi, Ali, Klem, Taco, and Jean-Philippe Pignol

Subjects
ComputingMethodologies_DOCUMENTANDTEXTPROCESSING
Abstract

CRF template. A predefined case report form provides instructions units to be used, missing data handling and range checks. (PDF 415 kb)

Published
2018
Full Text
View/download PDF

18. Efficient and reliable 3D dose quality assurance for IMRT by combining independent dose calculations with measurements

Author

Visser, Ruurd, Wauben, D.J.L., de Groot, Martijn, Godart, Jeremy, Langendijk, Johannes A., van't Veld, A.A., Korevaar, Erik W., and Healthy Ageing, Allied Health Care and Nursing

Subjects
stralingsdosering, kwaliteitscontrole, tijdsfactoren, radiotherapy, intensity-modulated, time factors, monte carlo methode, radiotherapie dosering, radiotherapy dosage, radiotherapie, intensiteit gemoduleerd, reproduceerbaarheid van de resultaten, radiation dosage, mensen, radiotherapie planning, computerondersteund, tijdschriftartikel, reproducibility of results, quality control
Abstract

PURPOSE: Advanced radiotherapy treatments require appropriate quality assurance (QA) to verify 3D dose distributions. Moreover, increase in patient numbers demand efficient QA-methods. In this study, a time efficient method that combines model-based QA and measurement-based QA was developed; i.e., the hybrid-QA. The purpose of this study was to determine the reliability of the model-based QA and to evaluate time efficiency of the hybrid-QA method. METHODS: Accuracy of the model-based QA was determined by comparison of COMPASS calculated dose with Monte Carlo calculations for heterogeneous media. In total, 330 intensity modulated radiation therapy (IMRT) treatment plans were evaluated based on the mean gamma index (GI) with criteria of 3%∕3mm and classification of PASS (GI ≤ 0.4), EVAL (0.4 < GI > 0.6), and FAIL (GI ≥ 0.6). Agreement between model-based QA and measurement-based QA was determined for 48 treatment plans, and linac stability was verified for 15 months. Finally, time efficiency improvement of the hybrid-QA was quantified for four representative treatment plans. RESULTS: COMPASS calculated dose was in agreement with Monte Carlo dose, with a maximum error of 3.2% in heterogeneous media with high density (2.4 g∕cm(3)). Hybrid-QA results for IMRT treatment plans showed an excellent PASS rate of 98% for all cases. Model-based QA was in agreement with measurement-based QA, as shown by a minimal difference in GI of 0.03 ± 0.08. Linac stability was high with an average GI of 0.28 ± 0.04. The hybrid-QA method resulted in a time efficiency improvement of 15 min per treatment plan QA compared to measurement-based QA. CONCLUSIONS: The hybrid-QA method is adequate for efficient and accurate 3D dose verification. It combines time efficiency of model-based QA with reliability of measurement-based QA and is suitable for implementation within any radiotherapy department.

Published
2013

19. Reconstruction of high resolution 3D dose from low resolution matrix measurements: the COMPASS correction kernel method

Author

Godart, Jeremy, Korevaar, Erik.W., Wauben, D.J.L., Visser, Ruurd, van 't Veld, Aart A., and Healthy Ageing, Allied Health Care and Nursing

Subjects
animal structures, genetic structures, food and beverages, radiotherapie, radiotherapy
Abstract

To quantify the dosimetric accuracy of the COMPASS correction kernel method, and to determine its ability to detect dose delivery errors caused by MLC leaf mis-positioning.

Published
2011

20. An efficient and independent 3D dose calculationtool for quality assurance of complex radiotherapy treatment plans

Author

Visser, Ruurd, Wauben, D.J.L., Godart, Jeremy, van 't Veld, Aart A., Korevaar, Erik.W., and Healthy Ageing, Allied Health Care and Nursing

Subjects
animal structures, radiotherapie, radiotherapy
Abstract

To validate the model-based 3D dose calculation performed by the COMPASS system, and to evaluate the use of the combination of model-based and measurement-based 3D dose determination for clinical QA purposes.

Published
2011

Catalog

Books, media, physical & digital resources
See catalog results