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A Monte Carlo simulation model of mammographic imaging with x-ray sources of finite dimensions

机译：有限尺寸X射线源的乳房X线摄影的Monte Carlo模拟模型

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A simulation model of mammographic x-ray sources with finite size has been developed. The model is based on Monte Carlo methods and it takes into account the electron penetration inside the anode, the anode geometry and material, as well as the resulting heel effect and the spectral and spatial distribution of x-rays. This x-ray source simulation model has been embedded into an earlier developed simulation package of a mammography unit. The main outputs of this model are Monte Carlo generated images that correspond to the irradiation of properly designed phantoms. In this way it is possible to make studies of the influence of x-ray source characteristics on MTF. This paper presents the development of the mammographic x-ray source model, accompanied by a set of simulation studies concerning the influence of magnification effects as well as that of the x-ray spatial and spectral distribution on the mammographic spatial resolution for a certain magnification factor (m = 1.4). The validity level of the model, as well as its limitations and perspectives, rise through comparisons with experimental and theoretical data.
机译：已经建立了具有有限尺寸的乳腺X射线源的仿真模型。该模型基于蒙特卡洛方法，它考虑了阳极内部的电子渗透，阳极的几何形状和材料以及所产生的横倾效应以及X射线的光谱和空间分布。该X射线源仿真模型已嵌入到早期开发的乳房X线照相单元仿真软件包中。该模型的主要输出是蒙特卡洛生成的图像，这些图像对应于正确设计的体模的照射。通过这种方式，有可能研究X射线源特性对MTF的影响。本文介绍了乳房X射线摄影X射线源模型的发展，并进行了一系列有关放大效果以及X射线空间和光谱分布在一定放大倍数下对乳房X射线摄影空间分辨率的影响的模拟研究。 （m = 1.4）。通过与实验和理论数据进行比较，可以提高模型的有效性水平，以及其局限性和观点。

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