在Ｘ线照片质量保证及控制系统中 ,根据胶片及显影液、增感屏的特性参数 ,确定恰当的曝光量 ,才能在影像信息的转化过程中充分发挥胶片的最佳性能 ,保证优质光学影像的形成。在Ｘ线照片质量保证及控制系统中 ,胶片及增感屏的特性参数比较稳定 ,而显影液的特性参数随着使用时间 In the X-ray photo quality assurance and control system, according to the characteristics of the film and the developer and the intensifying screen, the appropriate exposure amount is determined so that the best performance of the film can be fully utilized in the conversion process of the image information and the high-quality optical image can be guaranteed. Formation. In the X-ray photo quality assurance and control system, the characteristic parameters of the film and intensifying screen are relatively stable, and the characteristic parameters of the developer are used with the use time.