Purpose: We developed a graphical user interface (GUI) for electron phase-space field trimming using Monte Carlo simulations. This GUI can be used for monitor unit (MU) calculation in electron therapy. Methods: The GUI and electron field trimming algorithm were developed using MATLAB and C code. Phase-space files for the electron fields were generated using the EGSnrc code based on a Varian 21EX Linac with variables of applicator size, field size and energy. Verification of the alogrithm was carried out by comparing the relative output factor, which was used for MU calculation, predicted by Monte Carlo simulations and from actual measurements. Results: Our electron field trimming algorithm was found to be about five times faster than the original Monte Carlo simulation. Clinically, the GUI performed best when using voxel size ≥ 0.3 × 0.3 × 0.3 cm 3 , and field size larger than 2 cm in radius based on an acceptable deviation of 2%. Conclusion:

中文翻译：

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使用蒙特卡洛模拟（Monte Carlo Simulation）的电子疗法中的监测器单位计算：用于相空间场微调的GUI

目的：我们开发了图形用户界面（GUI），用于使用蒙特卡洛模拟进行电子相空间场微调。该GUI可以用于电子治疗中的监测单位（MU）计算。方法：使用MATLAB和C代码开发了GUI和电子场微调算法。使用基于Varian 21EX Linac的EGSnrc代码生成电子场的相空间文件，该文件具有施涂器尺寸，场尺寸和能量的变量。通过对相对输出因子进行比较来验证算法，该相对输出因子用于MU计算，由蒙特卡洛模拟和实际测量预测。结果：我们的电子场微调算法被发现比原始的蒙特卡洛模拟快约五倍。临床上，当使用体素大小≥0.3×0.3×0时，GUI表现最佳。3 cm 3，并且基于2％的可接受偏差，半径大于2 cm的字段大小。结论：