Bernstein H, Muntz E P
Med Phys. 1986 Nov-Dec;13(6):836-42. doi: 10.1118/1.595807.
It is shown that predictions can be made of scatter-to-primary ratios for a variety of mammographic configurations. The different configurations can be produced by changes in source-detector distance; source-phantom distance; air gap; photon energy; phantom composition, thickness, and cross-sectional area. A detailed analysis of the effect of a grid is also considered. The predictions are not computationally intensive. Experimental verifications of the predictions for varying phantom cross-sectional dimensions, source-detector distance, and air gaps with and without a grid have been carried out. Variations with phantom thickness were not considered in this paper. Detailed comparisons between experiment and theory indicate that scatter-to-primary ratios were predicted within one standard deviation and the coefficient of variation is within 3% for most of the data points with the worst case coefficient of variation about 6%. Measurements of grid secondary transmission have also been compared to theoretical predictions and agreement is within the coefficient of variation of about +/- 15%.
结果表明，对于各种乳腺摄影配置，可以预测散射与原发射线的比率。不同的配置可以通过源探测器距离、源体模距离、空气间隙、光子能量、体模组成、厚度和横截面积的变化来产生。还考虑了对滤线栅效果的详细分析。这些预测计算量不大。已经对有和没有滤线栅时不同体模横截面尺寸、源探测器距离和空气间隙的预测进行了实验验证。本文未考虑体模厚度的变化。实验与理论之间的详细比较表明，对于大多数数据点，散射与原发射线的比率预测在一个标准差内，变异系数在3%以内，最坏情况下的变异系数约为6%。滤线栅二次传输的测量结果也与理论预测进行了比较，一致性在约±15%的变异系数范围内。
