低强度又射线影像系统的信噪比分析

An Analyse of Signal-to-Noise Ratio About Low Intensity X-ray Imaging System

分析X射线系统的噪声来源 ,以一维方波图象为例 ,推导了其噪声表达式 ,得出图象传递信噪比。根据图象传递信噪比函数 ,讨论了入射线影像系统所能探测圈象的极限。

The noise source of the X-ray image system is explained detail. Based on the image of, the noise of output image and the signal-to-noise ratio of image passing is deduced. The paper discusses the detecting limit of image about the X-ray image system according to the signal-to-noise ratio of image passing.