Dosimetry test of domestically-made accelerator intensity-modulated radiation therapy and volumetric-modulated arc therapy
10.3760/cma.j.cn113030-20181008-00506
- VernacularTitle:国产加速器IMRT和VMAT的剂量学测试
- Author:
Dazhen JIANG
1
;
Hui LIU
;
Xiaoyong WANG
;
Dajiang WANG
;
Jiuling SHEN
;
Ji CHEN
;
Cheng CHEN
;
Hongli ZHAO
;
Zhirong BAO
;
Jun ZHANG
Author Information
1. 武汉大学中南医院放化疗科 湖北省肿瘤生物学行为重点实验室和湖北省肿瘤医学临床研究中心 430071
- From:
Chinese Journal of Radiation Oncology
2020;29(7):551-553
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To create AAPM TG 119 test plans for intensity-modulated radiation therapy (IMRT) and volumetric-modulated arc therapy (VMAT) in order to evaluate the accuracy of the United Imaging Healthcare′s URT treatment planning system (URT-TPS). The plans were delivered to the phantom using the United Imaging Healthcare′s URT-Linac 506C.Methods:The overall accuracy of IMRT and VMAT planning, measurement, and analysis were evaluated for four test geometries provided by American Association of Physicists in Medicine (AAPM) Task Group Report 119(TG-119) on multi-target, prostate, head and neck and C-shape (easy). The dose distributions were measured in the coronal plane. The point measurements were measured by a Farmer type ion chamber and fluence measurements were completed with film and Delta4 phantom, respectively. Measured planar dose distributions were analyzed using gamma index with criteria 3%/3 mm.Results:For IMRT and VMAT plans, the planning results matched the TG-119 planning results. Measured point doses of IMRT and VMAT were within 2.62% and 3.90% of the planned doses, respectively. Measured film dosimetry gamma values of IMRT and VMAT were> 97.50% and> 93.27%, respectively.Conclusion:Based on these analyses which were performed in line with the TG119 recommendations, it is evident that the URT treatment planning system and URT-Linac 506C have commissioned IMRT and VMAT techniques with adequate accuracy.
