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X-ray collimator design using monte carlo simulations

机译：使用Monte Carlo模拟的X射线准直仪设计

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摘要

The purpose of this study was to apply Monte Carlo (MC) based simulations to design a new collimation system to achieve a larger beam size (2 ± 0.1 cm) and tight penumbra (< 1 mm) with a kV X-ray small animal irradiator. The BEAMnrc and DOSXYZnrc MC-based programs were adapted to simulate the system. First the aperture of the primary collimator was expanded until the desired size of the beam was obtained. Subsequently, the beam was trimmed by reducing the aperture size of the secondary collimator in order to eliminate low energy scattered photons and sharpen the penumbra. Finally, the new collimator was constructed and the resultant dose distributions were evaluated with EBT2 film measurements. From the MC computed dose profiles, a 2.1 cm FWHM (1.9 cm width at 95% of the dose) and a sharp penumbra (< 1.0 mm) at 1.0 cm depth in water were obtained. Dose distribution comparisons between the EBT2 film measurements and the MC calculations showed acceptable agreement. MC-based calculation is an effective tool to expedite the creation of new collimator designs and avoid costly machining.
机译：这项研究的目的是应用基于蒙特卡洛（MC）的模拟来设计一种新的准直系统，以kV X射线小型动物辐照器实现更大的光束尺寸（2±0.1 cm）和半影的紧密（<1 mm） 。基于BEAMnrc和DOSXYZnrc MC的程序适用于模拟系统。首先扩大主准直仪的孔径，直到获得所需的光束尺寸。随后，通过减小次级准直仪的孔径尺寸来修剪光束，以消除低能散射的光子并锐化半影。最后，构造了新的准直仪，并使用EBT2薄膜测量仪评估了所得的剂量分布。从MC计算的剂量分布图中，获得了2.1厘米的FWHM（在95％的剂量下为1.9厘米宽）和在水中1.0厘米深度的半影（<1.0毫米）。 EBT2薄膜测量结果与MC计算之间的剂量分布比较显示出可接受的一致性。基于MC的计算是一种有效的工具，可加快创建新的准直仪设计并避免进行昂贵的加工。

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