Abstract

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Title:: Measurement of the dosimetric characteristics of ArcCheck and its application in VMAT plan verification

Author(s):: WANG Tao1; CHENG Xiuyan2; GUO Yuexin1; 1. Department of Radiotherapy, the First Affiliated Hospital of Zhengzhou University, Zhengzhou 450000, China; 2. Department of Radiotherapy, He’nan Cancer Hospital, Zhengzhou 450000, China

Keywords:: ; Keywords: dosimetric characteristic; ArcCheck; linearity; dose rate response; volumetric modulated arc therapy

Abstract:: Abstract: Objective To measure the dosimetric characteristics of ArcCheck and analyze the dosimetric characteristic curves of the detector for determining whether ArcCheck can meet the clinical requirements. Methods The reproducibility, energy response, angle response and dose-rate response of ArcCheck were measured. Results The normalized reproducibility of ArcCheck was 0.990 6±0.009 0. The analysis of energy response showed that after linear regression, the constant term was -0.257 5, with a standard deviation of 0.121 5, while the regression coefficient was 1.464 31, with a standard deviation of 5.368 72E-4. The curve of angle response accorded with the variations in the thickness of the superficial materials. Moreover, the changes in dose rate had trivial effects on the measurement. Conclusion The dosimetric characteristics of ArcCheck meet the clinical requirements, and ArcCheck can be applied in the verification of VMAT plan.