Abstract

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Author(s):: LI Qiaoyi1; BAI Long1; XU Qingfeng1; CHEN Lei2; XU Yunbo1; ZHOU Yang1; TANG Huanan1; ZHOU Li1; 1. Department of Radiation Oncology, Cancer Center (State Key Laboratory of Biotherapy), West China Hospital, Sichuan University, Chengdu 610041, China 2. Key Laboratory of Radiation Physics and Technology of Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610065, China

Keywords:: stereotactic radiotherapy small-field dosimetry Monte Carlo simulation review

Abstract:: Abstract: The application of small-filed photon beam has become one of the research hotspots in radiotherapy techniques such as stereotactic radiotherapy, but the accuracy of its dosimetry is limited by many factors. Based on the domestic and overseas research reports, the paper reviews those factors like radiation detectors of small-field dosimetry, correction factors for detector response and the comparison of dose accuracy among different calculation algorithms. The sensitive volume, type and correction factor of the detectors are very important to the measurement of small field. Monte Carlo simulation is an extremely effective tool for the small-field dosimetry. By a comparison based on Monte Carlo simulation, the accuracy of dose calculation among different algorithms are found different from each other, and the uniformity of the medium is one of the factors affecting the deviation of the algorithm. For the dose verification of an individualized treatment plan, the difference in dose accuracy is related to the size of planned target volume and depends on whether flattening filter has been used in the accelerator.