Abstract

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Title:: Application of SRS MapCHECK semiconductor detector array in dose verification for spine CyberKnife plan

Author(s):: ZHU Xiaohui1; LIANG Zhiwen1; CAO Ting1; HAN Jun1; WANG Haoning2; LONG Hao2; YANG Jing1; 1. Cancer Center, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China 2. School of Electronic and Information Engineering, South-Central Minzu University, Wuhan 430074, China

Keywords:: Keywords: SRS MapCHECK semiconductor array CyberKnife spine clinical plan dose verification gamma passing rate

Abstract:: Abstract: Objective To evaluate the applicability of SRS MapCHECK semiconductor detector in dose verification for spine CyberKnife plan. Methods SRS MapCHECK detector was installed in the specific StereoPHAN phantom to conduct research. The single-field plans delivered by CyberKnife fixed and Iris variable collimators, as well as the quality assurance (QA) plans for spine clinical plans were tested. SNC Patient software was used to compare and analyze the differences between the measured and planned dose profiles, and the gamma passing rates for the criteria of 2 mm/5%, 2 mm/3% and 2 mm/2% were calculated. Results In absolute dose analysis mode and under the criteria of 2 mm/5%, 2 mm/3% and 2 mm/2%, all the gamma passing rates of the single-field plans delivered by fixed or Iris variable collimators reached 100.0%, and the average gamma passing rates of the spine QA plans were 99.3%±1.2%, 96.5%±2.7% and 93.5%±5.3%, respectively. Conclusion SRS MapCHECK semiconductor detector is suitable for the quick dose verification for spine CyberKnife plans under the gamma criteria of 2 mm/5% and 2 mm/3%.