CT belongs to the radiology department, and every hospital has a radiology department, which can perform X-rays, CT, and MRI examinations. For CT can be used in the examination of various clinical departments, such as neurology CT can be used for head examination, which can distinguish ischemic cerebrovascular disease, hemorrhagic cerebrovascular disease, and intracranial occupying disease. CT can be used in cardiology, which can perform coronary CTA for coronary vascular assessment. CT can be used in gastroenterology, such as upper abdomen, lower abdomen CT can be used in orthopedics, such as neck, shoulder, lumbar and knee joints.