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首页> 外文期刊>Medical Physics >Photon scatter in portal images: physical characteristics of pencil beam kernels generated using the EGS Monte Carlo code.
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Photon scatter in portal images: physical characteristics of pencil beam kernels generated using the EGS Monte Carlo code.

机译：门户图像中的光子散射：使用EGS蒙特卡洛代码生成的笔形光束内核的物理特征。

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摘要

Pencil beam kernels describing scattered photon fluence behind homogeneous water slabs at various air gap distances were generated using the EGS Monte Carlo code. Photon scatter fluence was scored in separate bins based on the particle's history: singly scattered, multiply scattered, and bremsstrahlung and positron annihilation photons. Simultaneously, the mean energy and mean angle with respect to the incident photon pencil beam were tallied. Kernels were generated for incident photon pencil beams exhibiting monoenergetic spectra of 2.0 and 10.0 MeV, and polyenergetic spectra representative of 6 and 24 MV beams. Reciprocity was used to generate scatter fractions on the central axis for various field sizes, phantom thicknesses, and air gaps. The scatter kernels were further characterized by full width at half-maximum estimates. Modulation transfer functions were calculated, providing theoretical estimates of the limit of performance of portal imaging systems due to the intrinsic scattering of photon radiation through the patient.
机译：使用EGS蒙特卡洛代码生成描述不同气隙距离下均质水板后面的散射光子通量的笔形束核。根据粒子的历史记录，在单独的容器中对光子散射通量进行了评分：单个散射，多重散射以及，致辐射和正电子an没光子。同时，计算了相对于入射光子笔束的平均能量和平均角度。产生入射光子笔形光束的核，其表现出2.0和10.0 MeV的单能谱，代表6和24 MV束的多能谱。互易性用于在中心轴上生成各种场大小，幻影厚度和气隙的散射分数。散射核的特征还在于最大宽度估计值为一半时的全宽。计算了调制传递函数，由于通过患者的光子辐射的固有散射，提供了门禁成像系统性能极限的理论估计。

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