CT cranial plain scan is most commonly used to examine lesions of traumatic brain injury and stroke, as well as to exclude lesions, as follows: 1. Traumatic brain injury: When a patient is suspected of having cranial trauma, the most common examination means is cranial CT plain scan, which can clarify whether there is intracranial hemorrhage and hematoma, and also check whether there is skull fracture. 2. Stroke: Cranial CT plain scan, as a common examination means for stroke, can help clinical, rapid examination of whether there is cerebral hemorrhage, cerebral infarction, etc. 3. 3.Exclusion of lesions: The common CT scan of the head can also be used to exclude some lesions in patients with dizziness and headache.