CT scanning can detect the following diseases: First, hemorrhagic lesions: hemorrhagic lesions are especially prominent on CT, especially in the acute stage, the nature of the lesion can be clarified through the measurement of CT value, when the CT value of 60-80HU, it can be accurately diagnosed as acute hemorrhage. Second, fracture: CT scan can clearly diagnose traumatic fracture, the degree of fracture and fracture involvement can be clarified by CT scan, for some subtle avulsion fracture, CT shows good effect. Third, occupying lesions: CT scanning is more often used to find occupying lesions.