CT examination is of high value for the diagnosis of central nervous system diseases and is more common in clinical application. In the clinic, CT examination is able to locate and qualitatively diagnose stroke, traumatic brain injury, brain inflammation, tumor, cerebral atrophy, degenerative brain lesions, and cerebral parasitic disease. In particular, CT angiography, or CTA, has a good diagnostic effect on cerebral hemangiomas and vascular malformations. If the patient has recurrent headaches, vomiting, hemiplegia, speech problems, etc., it is recommended to have a CT examination of the brain as soon as possible, and under the guidance of the doctor, to avoid delaying the time of treatment.