Commissioning and dosimetric verification of volumetric modulated arc therapy for multiple modalities using electronic portal imaging device-based 3D dosimetry system: a novel approach.

IF 1.7 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Radiological Physics and Technology Pub Date : 2024-06-01 Epub Date: 2024-03-16 DOI:10.1007/s12194-024-00792-z
Raghavendra Hajare, Sreelakshmi K K, Anil Kumar, Rituraj Kalita, Shanmukhappa Kaginelli, Umesh Mahantshetty
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Abstract

The purpose of this study was to validate an electronic portal imaging device (EPID) based 3-dimensional (3D) dosimetry system for the commissioning of volumetric modulated arc therapy (VMAT) delivery for flattening filter (FF) and flattening filter free (FFF) modalities based on test suites developed according to American Association of Physicists in Medicine Task Group 119 (AAPM TG 119) and pre-treatment patient specific quality assurance (PSQA).With ionisation chamber, multiple-point measurement in various planes becomes extremely difficult and time-consuming, necessitating repeated exposure of the plan. The average agreement between measured and planned doses for TG plans is recommended to be within 3%, and both the ionisation chamber and PerFRACTION™ measurement were well within this prescribed limit. Both point dose differences with the planned dose and gamma passing rates are comparable with TG reported multi-institution results. From our study, we found that no significant differences were found between FF and FFF beams for measurements using PerFRACTION™ and ion chamber. Overall, PerFRACTION™ produces acceptable results to be used for commissioning and validating VMAT and for performing PSQA. The findings support the feasibility of integrating PerFRACTION™ into routine quality assurance procedures for VMAT delivery. Further multi-institutional studies are recommended to establish global baseline values and enhance the understanding of PerFRACTION's capabilities in diverse clinical settings.

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使用基于电子门成像设备的三维剂量测定系统对多种模式的容积调制弧治疗进行调试和剂量测定验证:一种新方法。
本研究的目的是根据美国医学物理学家协会任务组 119 (AAPM TG 119) 和治疗前患者特定质量保证 (PSQA) 开发的测试套件,验证基于电子门成像设备 (EPID) 的三维 (3D) 剂量测定系统,用于调试扁平化滤光片 (FF) 和无扁平化滤光片 (FFF) 模式的容积调制弧治疗 (VMAT)。使用电离室时,在不同平面上进行多点测量变得极其困难和耗时,因此必须对计划进行重复照射。TG 计划的测量剂量和计划剂量之间的平均一致性建议在 3% 以内,而电离室和 PerFRACTION™ 的测量结果都在规定范围内。点剂量与计划剂量的差异以及伽马通过率都与 TG 多机构报告的结果相当。我们的研究发现,在使用 PerFRACTION™ 和离子室进行测量时,FF 和 FFF 束之间没有明显差异。总体而言,PerFRACTION™ 能够产生可接受的结果,可用于调试和验证 VMAT 以及执行 PSQA。研究结果支持将 PerFRACTION™ 纳入 VMAT 传输的常规质量保证程序的可行性。建议进一步开展多机构研究,以确定全球基线值,并加深对 PerFRACTION™ 在不同临床环境中能力的了解。
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来源期刊
Radiological Physics and Technology
Radiological Physics and Technology RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING-
CiteScore
3.00
自引率
12.50%
发文量
40
期刊介绍: The purpose of the journal Radiological Physics and Technology is to provide a forum for sharing new knowledge related to research and development in radiological science and technology, including medical physics and radiological technology in diagnostic radiology, nuclear medicine, and radiation therapy among many other radiological disciplines, as well as to contribute to progress and improvement in medical practice and patient health care.
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