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采用BEAMnrc模拟医用加速器治疗头,研究均匀轫致辐射分裂、选择轫致辐射分裂和方向轫致辐射分裂三种方差减小技术并设置参数,计算相空间文件;将相空间文件输入至DOSXYZnrc中,选择光子分裂、粒子循环技术提高效率,计算水模体中的剂量分布。结果显示,在BEAMnrc中,使用无电子分裂的方向轫致辐射,当分裂数为2500时,计算效率最高;在DOSXYZnrc中,当光子分裂数为40时计算效率最高。表明合适的轫致辐射方式及参数,一定的光子分裂数和粒子循环数能提高计算效率。
BEAMnrc simulation of medical accelerator treatment of head, the study of uniform bremsstrahlung radiation splitting, the choice of bremsstrahlung and directional Bremsstrahlung three kinds of variance reduction techniques and set parameters to calculate the phase space file; the phase space file is input to the DOSXYZnrc, Select photon splitting, particle circulation technology to improve efficiency, calculate the water phantom dose distribution. The results show that in BEAMnrc, the use of non-electron-splitting directional bremsstrahlung gives the highest computational efficiency when the number of splits is 2500; in DOSXYZnrc, the computational efficiency is highest when the number of splits is 40. The results show that the appropriate bremsstrahlung methods and parameters, the number of photon splitting and the number of particle cycles can improve the computational efficiency.