【摘 要】
：
In this paper, the beam quality and percent depth dose curves for different field sizes of Cyber Knife(R) system were investigated by Monte Carlo simulations us
【机 构】
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Shanghai Applied Radiation Institute,Cyberknife center Hua Shan Hospital Affiliated to School of Med
【基金项目】
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上海市科委启明星计划项目;Shanghai Leading Academic Disciplines
论文部分内容阅读
In this paper, the beam quality and percent depth dose curves for different field sizes of Cyber Knife(R) system were investigated by Monte Carlo simulations using the PENELOPE code, which has been used to simulate 6 MV photon beam. In water phantom, the absolute doses were calculated for φ10-60 mm collimators, and percent depth dose curves were evaluated for φ30-60 mm collimators. The agreement ofdose distributions of the calculation with measurement was within 3.0%. The mean energy ofphoton spectrum was 1.46 MeV, and the beam quality index was 0.632, which was slightly smaller than that ofmeasurement.
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