Abstract

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Title:: EDose software-based electronic portal imaging device for dosimetric verification of intensity-modulated radiotherapy plan

Author(s):: LI Yucheng1; CHENG Pinjing1; SHAN Guoping2; CHEN Xiang1; SHAO Kainan2; YANG Yiwei2; LI Pu2; CHEN Weijun3; 1. School of Nuclear Science and Technology, University of South China, Hengyang 421001, China; 2. Zhejiang Cancer Hospital, Hangzhou 311400, China; 3. Zhejiang Provincial People’s Hospital, Hangzhou 311400, China

Keywords:: ; Keywords: electronic portal imaging device; intensity-modulated radiotherapy; dosimetric verification; gamma passing rate

Abstract:: Abstract: Objective To investigate the feasibility of electronic portal imaging device (EPID) for the three-dimensional dosimetric verification of intensity-modulated radiotherapy (IMRT) plan. Methods The IMRT plans of 10 patients were verified with two systems, namely EDose software-based EPID of Varian Trilogy Linacs and Mapcheck system from Sun Nuclear Corporation with the matching phantom. The gamma passing rates of absolute dose and relative dose in two systems was recorded and analyzed. Results When the gamma standard (3%/3 mm) was applied, the gamma passing rates of relative doses in EPID and Mapcheck system were (98.51%±1.10%) and (98.73%±0.69%), respectively, and those of absolute doses were (96.50%±3.33%) and (97.64%±1.51%), respectively, without any statistical differences (P>0.05). For the other standards, the differences in gamma passing rates between EPID and Mapcheck system were statistically significant. Conclusion EPID is more convenient and efficient than Mapcheck system and can be used as a tool for three-dimensional dosimetric verification of IMRT plan.