一般的X光机其漏光原因多为密封不严所致，因而，分析查找原因相对容易。但有时漏光原因较为复杂，查找起来费时、费力，而且还要浪费一些胶片。笔者遇到的故障比较特殊。现介绍如下，以同行参考。l故障现象胶片曝光后，在固定位置出现伪影，而且影像浓度与人体组织影像浓度差 The cause of light leakage in general X-ray machines is mostly caused by loose seals. Therefore, it is relatively easy to analyze and find reasons. However, sometimes the cause of light leakage is complicated. It takes time and effort to find it, and it also wastes some films. The fault I encountered was special. The introduction is as follows, with reference to peers. l Symptom After the film is exposed to light, artifacts appear at fixed positions, and the image density and image density of human tissue are different.