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Chinese Journal of Radiation Oncology  2017, Vol. 26 Issue (2): 197-201    DOI: 10.3760/cma.j.issn.1004-4221.2017.02.016
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Commission of volumetric modulated arc therapy with electronic portal image device
Ma Yangguang,Pei Yuntong,Mai Rizhen,Hu Jinyan,Liu Shuaipeng,Jia Fei,Wang Tao,Liu Lele,Guo Yuexin
Department of Radiation Oncology,First Affiliated Hospital of Zhengzhou University,Zhengzhou 450052,China (Ma YG,Pei YT,Hu JY,Liu SP,Jia F,Wang T,Liu LL,Guo YX);Department of Medical Equipment,The First Affiliated Hospital of Zhengzhou University (Mai Rizhen)
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Abstract  Objective To apply electronic portal imaging device (EPID) in the quality assurance of volumetric modulated arc therapy (VMAT) delivered by TrueBeam linear accelerator. Methods The Shaper software and Eclipse treatment planning system (TPS) were used to edit the VMAT plan delivered by TrueBeam linear accelerator. The EPID was used to evaluate the setup accuracy of multi-leaf collimator (MLC) and clinical dosimetry. TA:a field with a size of 0.5 cm×20.0 cm was exposed with gantry angles of 0°, 90°, and 270°, respectively;TB:the flatness and stability of the field were tested with different combinations of dose rate and gantry angle speed;TC:the setup accuracy of MLC was evaluated with or without rotation;TD:the accuracy of speed change control of MLC was evaluated with or without rotation;TE:the accuracy of simultaneous changes in dose rate and gantry angle speed was evaluated;TF:Clinical patients were evaluated. The Matlab software was used to analyze the results. Results TA:the full width at half maximum of superimposed fields exposed with gantry angles of 0°, 90°, and 270°was 0.39 mm larger than that of the field exposed with a gantry angle of 0°. TB:the difference in flatness was less than 0.5% between fields with different combinations of dose rate and gantry angle speed. TC:the maximum difference in field center was 0.45 mm between EPID measurement and TPS setting. TD:the maximum difference in MLC position was 0.69 mm between EPID measurement and TPS setting. TE:the maximum difference was 0.42 mm between fields. TF:for all the patients, the lowest γ passing rate was 96.4% according to the criterion of 3%/3 mm. Conclusions EPID is an accurate and convenient approach for VMAT quality assurance, which provides an option for physicists to reduce workload.
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Articles by authors
Ma Yangguang
Pei Yuntong
Mai Rizhen
Hu Jinyan
Liu Shuaipeng
Jia Fei
Wang Tao
Liu Lele
Guo Yuexin
Key wordsElectronic portal image device      Volumetric modulated arc therapy      Quality control
 
                    Fund program:Henan Medical Science and Technology Project (201303043)     
Received: 26 April 2016     
Corresponding Authors: Guo Yuexin,Email:guoyx0371@126.com   
Cite this article:   
Ma Yangguang,Pei Yuntong,Mai Rizhen et al. Commission of volumetric modulated arc therapy with electronic portal image device[J]. Chinese Journal of Radiation Oncology, 2017, 26(2): 197-201.
Ma Yangguang,Pei Yuntong,Mai Rizhen et al. Commission of volumetric modulated arc therapy with electronic portal image device[J]. Chinese Journal of Radiation Oncology, 2017, 26(2): 197-201.
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