Commissioning and testing of treatment planning system model of an Edge accelerator with a high-definition multi-leaf collimator
10.3760/cma.j.issn.1004-4221.2019.02.007
- VernacularTitle:高分辨多叶准直器HD-MLC的Edge加速器TPS模型建立及测试
- Author:
Yangguang MA
1
;
Tao WANG
;
Jinyan HU
;
Zheng ZHANG
;
Fangna WANG
;
Xuemin WANG
;
Yuexin GUO
Author Information
1. 郑州大学第一附属医院放射治疗部 450052
- Keywords:
Commission of treatment planning model;
Small-field measurement;
HD-MLC feature parameter testing;
Edge Linac
- From:
Chinese Journal of Radiation Oncology
2019;28(2):113-118
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the commissioning and testing of the Eclipse model of an Edge accelerator with high-definition muhi-leaf collimator (HD-MLC).Methods The percentage depth dose (PDD),profile,output factor measured by Razor and CC13 were statistically compared with the standard data.Penumbra,transmission factor (TF),leakage,concave-convex groove,accuracy of movement and dosimetry leaf gap (DLG) were measured with EBT3,electronic portal image device (EPID) and PTW SRS1000&SRS1500.The optimal DLG/TF was acquired when the γ pass rate of test cases was the highest.The point dose of regular fields,intensity-modulated radiation therapy (IMRT) and volume-modulated radiation therapy (VMAT) was verified with FC65-G.The planar dose of these case was verified with Octavius 4D and EBT3.Results The measured PDD data were consistent with the standard data.The measured penumbra of 3 cm and 4 cm square fields was smaller,whereas that of 6 cm square field was larger than the standard values.The left and right edge,field size,center of the field were distributed within the range of-1.0-0.4 mm、0.2-1.7 mm,-0.3-1.9 mm and-0.1-0.8 mm,respectively.The mean penumbra of the left and right MLC in different positions were (2.5±0.042) mm and (2.7±0.005) mm.The leakage of MLC was 0.009-0.016.The measured DLG/TF was 0.1861 cm/0.0116 and the optimal DLG/TF was 0.015 cm/0.014.The differences of point dose of all the test cases except the one which was in the low-dose area were within ±3％.Local and global γ pass rates of all IMRT were 79.81％-100％ and 96.3％-100％ (3％/3 mm),71.3％-98.9％ and 94.3％-99.8％ for VMAT cases.Conclusions This method can accurately test and commission the Eclipse treatment planning model of Edge Linac equipped with HD-MLC.
