Scatter/primary in mammography: Monte Carlo validation
Scatter/primary in mammography: Monte Carlo validation
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DOI：
10.1118/1.1287052
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发表时间：
2000-08-01
期刊：
影响因子：
3.8
通讯作者：
Cooper, VN
中科院分区：
文献类型：
--
作者：
Boone, JM;Cooper, VN
本研究的目的是比较和验证SIERRA Monte Carlo模拟例程在乳腺X射线摄影设置中用于分析散射与原发比（SPR）的性能。两种蒙特卡罗模拟方法，直接方法是一个简单的和几何精确的模拟过程，卷积方法使用理想化的几何形状（单能，正常入射的δ函数输入到散射介质），以产生散射点扩展函数（PSF）。通过感兴趣的X射线光谱对PSF进行加权，并将其与视图进行卷积以估计SPR值。将两种Monte Carlo程序的SPR结果与五种已发表的来源进行了广泛比较，包括蒙特-卡罗衍生和物理测量的SPR评估。直接法显示与文献的总体一致性为3.7%准确度（N = 5），卷积法显示平均准确度为7.1%（N = 14）。在一系列参数范围内进行比较，这些参数包括视野、体模厚度、X射线能量和体模组成。同时也讨论了束流停止法的局限性。结果表明，SIERRA蒙特卡罗例程产生准确的SPR计算，并可能是有用的一个更全面的研究乳腺X射线摄影散射。(C)2000年美国医学物理学家协会。【S0094-2405（00）01808-3】。
The purpose of this investigation was to compare and validate the performance of the SIERRA Monte Carlo simulation routines for the analysis of the scatter to primary ratio (SPR) in the mammography setting. Two Monte Carlo simulation methods were addressed, the direct method was a straightforward and geometrically accurate simulation procedure, and the convolution method uses idealized geometry (monoenergetic, normally incident delta function input to the scattering medium) to produce scatter point spread functions (PSFs). The PSFs were weighted by the x-ray spectrum of interest and convolved with the held of view to estimate SPR values. The SPR results of both Monte Carlo procedures were extensively compared to five published sources, including Monte-Carlo-derived and physically measured SPR assessments. The direct method demonstrated an overall agreement with the literature of 3.7% accuracy (N = 5), and the convolution method demonstrated an average of 7.1% accuracy (N = 14). The comparisons were made over a range of parameters which included field of view, phantom thickness, x-ray energy, and phantom composition. Limitations of the beam stop method were also discussed. The results suggest that the SIERRA Monte Carlo routines produce accurate SPR calculations and may be useful for a more comprehensive study of scatter in mammography. (C) 2000 American Association of Physicists in Medicine. [S0094-2405(00)01808-3].