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Commissioning and testing of treatment planning system model of an Edge accelerator with a high-definition multi-leaf collimator
Ma Yangguang1, Wang Tao1, Hu Jinyan1, Zhang Zheng1, Wang Fangna1, Wang Xuemin2, Guo Yuexin1
1Department of Radiation Oncology, First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052,China; 2Department of Radiotherapy Hospital Unit Radiation Therapy, Shanxi Provincial Tumor Hospital, Xi′an 710061,China
AbstractObjective To investigate the commissioning and testing of the Eclipse model of an Edge accelerator with high-definition multi-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.
Fund:Henan Provincial Medical Science and Technology Research Project (201602035);Henan Provincial Science and Technology department Research Project (182102310369);Henan Provincial Medical Science and Technology Project (201303043)
About author:: Henan Provincial Medical Science and Technology Research Project (201602035);Henan Provincial Science and Technology department Research Project (182102310369);Henan Provincial Medical Science and Technology Project (201303043)
Cite this article:
Ma Yangguang,Wang Tao,Hu Jinyan et al. Commissioning and testing of treatment planning system model of an Edge accelerator with a high-definition multi-leaf collimator[J]. Chinese Journal of Radiation Oncology, 2019, 28(2): 113-118.
Ma Yangguang,Wang Tao,Hu Jinyan et al. Commissioning and testing of treatment planning system model of an Edge accelerator with a high-definition multi-leaf collimator[J]. Chinese Journal of Radiation Oncology, 2019, 28(2): 113-118.
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2019, Vol. 28 
