Hospital CT is one of the examination methods in medical imaging, which can examine the organs of the whole body, which include respiratory system, digestive system, urinary system, nervous system, circulatory system, bone and joint, etc. CT examination can evaluate the health of the body and diagnose diseases, such as lung CT to observe whether there is inflammation, tumor, tuberculosis, fluid accumulation, etc. in the lungs. For diseases of the urinary system, CT examination of the pelvis can be chosen. For patients with traumatic brain injury, cerebral infarction, and brain tumor, CT examination of the head is required. For digestive system diseases, CT examination of the abdomen is required. These examinations can clarify the diagnosis and provide a scientific basis for clinical treatment.