Background/Aim: The Purpose of this study was to develop a Monte Carlo (MC) model for the Agility multileaf collimator (MLC) mounted and to validate its accuracy. Materials and Methods: To describe the Agility MLC in the BEAMnrc MC code, an existing component module code was modified to include its characteristics. The leaf characterization of the MC model was validated by comparing the calculated interleaf transmission and tongue-and-groove effect with EBT2 film and diode measurements and IMRT and VMAT calculations with film measurements. Results: Agreement between mean calculated and measured leaf transmissions was within 0.1%. The discrepancy between MC calculation and measurement in a static irregular field was less than 2%/2 mm. Gamma analysis of the comparison of MC and EBT2 film measurements in IMRT and VMAT fields yielded pass rates of 99.1% and 99.5% with 3%/3 mm criteria, respectively. Conclusion: Our findings demonstrate the accuracy of the MC model using an adapted BEAMnrc component module for the Agility MLC.

中文翻译：

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用于 IMRT 和 VMAT 计算的 Agility MLC 的 Monte Carlo 建模

背景/目的：本研究的目的是为安装的 Agility 多叶准直器 (MLC) 开发蒙特卡罗 (MC) 模型并验证其准确性。材料和方法：为了在 BEAMnrc MC 代码中描述 Agility MLC，修改了现有的组件模块代码以包含其特性。MC 模型的叶片特征通过比较计算的叶间传输和舌槽效应与 EBT2 薄膜和二极管测量以及 IMRT 和 VMAT 计算与薄膜测量进行验证。结果：平均计算和测量的叶传输之间的一致性在 0.1% 以内。在静态不规则场中 MC 计算和测量之间的差异小于 2%/2 mm。对 IMRT 和 VMAT 领域中 MC 和 EBT2 薄膜测量值的比较进行伽马分析，结果通过率为 99。1% 和 99.5% 分别为 3%/3 mm 标准。结论：我们的研究结果证明了使用适用于 Agility MLC 的 BEAMnrc 组件模块的 MC 模型的准确性。