Abstract

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Title:: Application of rapid daily quality assurance for pencil beam scanning proton therapy system

Author(s):: ZHENG Renchao1; LU Xiaoguang2; WU Weiqing1; XIAO Zhiping1; LIU Fei1; HU Guangyuan1; YUAN Xianglin1; 1. Department of Oncology, Tongji Hospital Affiliated to Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China 2. Research and Development Center of Precision Radiation Diagnosis and Treatment Technology, Research Institute of Tsinghua University in Shenzhen, Shenzhen 518057, China

Keywords:: Keywords: Sphinx Compact pencil beam scanning proton therapy system daily quality assurance

Abstract:: Abstract: Objective To analyze the daily quality assurance (QA) measurement results of IBA Sphinx Compact device on the Mevion compact pencil beam scanning proton therapy system for evaluating its clinical application value in proton therapy. Methods The daily QA measurement of Mevion S250i proton therapy system was carried out with Sphinx Compact device for 30 consecutive days, and the measurement results were analyzed. Results The average deviation between the positioning laser and the image center was (0.42±0.27) mm in 30 days. All of the proximal and distal depth errors of the high- and low-energy pencil beams were within 0.50 mm. The position deviation of all the spots measured did not exceed 1.00 mm, and the size deviation was less than 7.5%. The deviation between the image center and the beam center was not more than 0.75 mm. The relative deviation of the flatness of the rectangular field was about 0.5%. The deviation of the output dose of the square field was within 1.0%. Conclusion The proton system daily QA measurement items recommended by AAPM TG-224 report can be accurately and rapidly measured with Sphinx Compact device. The device is a practical and efficient daily QA tool with high practical value in clinic.