CT故障引起图像异常的因素较多，诸如数据采集、放大、转换、处理、重建、显示等任何一个环节的故障，均可能造成。但探测器电源滤波电容容量下降，致直流输出中有交流成份，引起图像异常，维修中易因忽视而走弯路。故障现象开机扫描病人，初时有水波纹影干扰图像，较细小，数 There are many factors that cause image abnormality due to CT faults, such as data acquisition, amplification, conversion, processing, reconstruction, and display. However, the capacity of the filter capacitor of the power supply of the detector is reduced, and the AC component is caused in the DC output, which causes abnormal images. In the maintenance, it is easy to go detour due to neglect. Symptoms Power scans the patient. Initially there is a water ripple image that disturbs the image.