RapidArc Delivery Performance Using EDR2 Film and EPID Measurement

VernacularTitle:利用EDR2胶片和EPID实施容积旋转调强治疗性能测试的评估
Author: Ruigang GE ¹ ; Shouping XU ; Wei XU ; Chuanbin XIE ; Xiaohu CONG ; Tao YANG
Author Information

1. 解放军总医院放疗科
Keywords: VMAT; EDR2 film; EPID; quality assurance (QA)
From: Chinese Journal of Medical Instrumentation 2016;40(3):221-224
CountryChina
Language:Chinese
Abstract: This study describes the development and implementation of EDR2 film and electronic portal imaging device (EPID) during RapidArc QA. The tests were designed to evaluate RapidArc performance using EDR2 film and EPID tools. The accuracy of MLC position during gantry rotation, the ability to vary and control the dose-rate and gantry speed, the synchronization of variable MLC speed and dose-rate were examined. The picket fence test of MLC in stationary gantry and RapidArc modes were implemented. The film and EPID showed a good consistency. During the evaluation of MLC speed, gantry speed and dose-rates, the dose of different parts in a field showed a good agreement, with the mean deviation of 0.24%vs 0.19%. The analysis of dose value was less than 2%. This study demonstrated that EDR2 film and EPID system can be used as reliable and efficient quality assurance tools for RapidArc delivery performance. Of course, the use of VMAT QA with EPID increases the efficiency of routine QA.