射线照相噪声(颗粒度)的理论模式与实验验证

Theoretical Model of Radiographic Noise (Granularity) and Experimental Confirmation

在射线照相影象质量的三要素中，影象噪声 (颗粒度 )是先决性的。本文介绍射线底片上噪声的理论处理模式，并对工业上常用的 Agfa D4和 D7胶片，就计算求出的相关于底片黑度的噪声量值，与实验结果作了比较，两者数值颇为一致。

In the three main factors of radiographic image quality, noise (granularity) is the prerequisite one .Here is a theoretical model of the noise in radoghraphs .Calculating the noise values under different densities and comparing them with the experimental results, a good agreement is shown.