Plewes D B, McFaul J, Ivanovic M
Department of Medical Biophysics, University of Toronto, Ontario, Canada.
Med Phys. 1990 May-Jun;17(3):357-61. doi: 10.1118/1.596515.
The results of a numerical simulation indicate that scanning equalization radiography (SER) provides the opportunity to use film/screen combinations of significantly higher contrast than currently practical in conventional chest radiography. These calculations which attempt to maximize overall image contrast while minimizing areas of over and under exposure demonstrate that optimum film gradient varies inversely with scanning beam area. Furthermore, we show that in an SER system which we have optimized for chest imaging that the peak film gamma gradient can be increased from that typical of conventional films (3.0-3.5) to approximately 7 with advantage.
数值模拟结果表明，扫描均衡射线照相术（SER）提供了使用对比度比传统胸部射线照相术中目前实际应用的显著更高的胶片/增感屏组合的机会。这些旨在在使曝光过度和曝光不足区域最小化的同时最大化整体图像对比度的计算表明，最佳胶片梯度与扫描束面积成反比。此外，我们表明，在我们针对胸部成像进行优化的SER系统中，胶片的峰值伽马梯度可以从传统胶片的典型值（3.0 - 3.5）有利地提高到约7。
