Nalcioglu O, Roeck W W, Lando A V, Seibert J A
Phys Med Biol. 1984 Oct;29(10):1231-6. doi: 10.1088/0031-9155/29/10/006.
In recent years the contrast ratio (CR) has played an important role in the quantitation of imaging performance of X-ray image intensifiers. In practice, one uses either a lead disc or strip for measurement of contrast ratios. A theoretical relationship relating contrast ratios measured by both disc and strip techniques is discussed and experimental results are presented. The theoretical analysis uses the point spread function model to describe veiling glare for an image intensifier. It has been shown that one can predict strip contrast ratios after a determination of the veiling glare point spread function from a measurement of disc contrast ratios.
近年来，对比度（CR）在X射线图像增强器成像性能的定量分析中发挥了重要作用。在实际操作中，人们使用铅盘或铅条来测量对比度。本文讨论了通过圆盘和条带技术测量的对比度之间的理论关系，并给出了实验结果。理论分析使用点扩散函数模型来描述图像增强器的散射光晕。结果表明，在通过测量圆盘对比度确定散射光晕点扩散函数之后，可以预测条带对比度。
