Abstract

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Title:: Comparison of dose verification by SRS MapCHECK versus EDOSE for stereotactic radiotherapy

Author(s):: YUAN Ling; LIU Ying; XU Yaoyao; ZHANG Hongli; ZHANG Xiaopeng; WANG Xin; SHI Xingyuan; Department of Radiotherapy, the Fifth Affiliated Hospital of Guangzhou Medical University, Guangzhou 510700, China

Keywords:: Keywords: stereotactic radiotherapy SRS MapCHECK EDOSE gamma passing rate dose verification

Abstract:: Abstract: Objective To carry out dose verification for stereotactic radiotherapy (SRT) using SRS MapCHECK and EDOSE, and to compare the results of dose verification between SRS MapCHECK and EDOSE. Methods The gamma passing rate (3%/3 mm) for different square fields (2 cm×2 cm, 4 cm×4 cm, 6 cm×6 cm, 10 cm×10 cm) using SRS MapCHECK and EDOSE for dose verification were compared, and then, 29 SRT plan were selected to analyze the absolute dose passing rate between SRS MapCHECK and EDOSE at different gamma criteria. Finally, the effects of 4 different physical models established in EDOSE system on the dose verification for SRT plan were analyzed. Results The gamma passing rates of absolute dose obtained by SRS MapCHECK in all square fields and 29 cases of SRT plan were higher those of EDOSE, and the verification results between two systems were statistically different (P<0.05). The gamma passing rates (2%/2 mm) of SRS MapCHECK and EDOSE for 29 cases of SRT plan were 98.60%±2.14% and 96.53%±2.41%, respectively. The verification results among different EDOSE physical models were statistically different, and the deviation of average gamma passing rate (2%/2 mm) was 1.8%-5.1%. Conclusion Both SRS MapCHECK and EDOSE satisfy the requirements of dose verification for SRT plan, but the passing rate of dose verification of SRS MapCHECK is higher than that of EDOSE. The dose verification for SRT plan can be affected by different EDOSE physical models.