Abstract

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Title:: Dose reconstruction of electronic portal imaging device based on calibration and calculation

Author(s):: SUI Jianfeng1; 2; 3; SUN Jiawei1; 2; 3; XIE Kai1; 2; 3; GAO Liugang1; 2; 3; LIN Tao1; 2; 3; NI Xinye1; 2; 3; 1. Department of Radiotherapy, the Affiliated Changzhou No.2 Peoples Hospital of Nanjing Medical University, Changzhou 213161, China 2. Center of Medical Physics, Nanjing Medical University, Changzhou 213161, China 3. Jiangsu Province Engineering Research Center of Medical Physics, Changzhou 213161, China

Keywords:: Keywords: dose calibration dose calculation electrionic portal imaging device reconstruction verification

Abstract:: Abstract: A dose reconstruction algorithm for electrionic portal imaging device (EPID) based on calibration and calculation is developed. The raw data of EPID in continuous acquisition mode are corrected for dark field and gain, and the gray level features of bright field are used to determine the field boundary. Subsequently, MU calibration, off-axis calibration and field size calibration are performed on the EPID data, and dose reconstruction is carried out based on the calibrated superimposed flux and the Monte Carlo model of the linac head. Nine cases of IMRT plans are selected for verification and measurement using EPID and MapCheck separately, and the passing rates between the two tools are compared under different gamma criteria (3%/3 mm and 2%/2 mm). For a planned case, the average passing rates of multiple cases verified by MapCheck under the two criteria were 99.02%±1.28% and 90.84%±4.49%, and the average passing rates of the EPID reconstruction models were 98.86%±1.19% and 91.39%±4.80%. Compared with MapCheck, the EPID reconstruction algorithm based on calibration and calculation has no significant difference in the passing rate of IMRT plan verification (P>0.05), which meets the clinical requirements of dose verification.