A CT scan of the head and a CT of the brain are the same kind of test. Routine CT scans of the head are indicated for the diagnosis of intracranial hematomas, traumatic brain injuries, cerebral hemorrhages, subarachnoid hemorrhages, cerebral infarcts, brain tumors, hydrocephalus of the brain cerebral atrophy, inflammatory brain disorders, as well as parasitic disorders of the brain such as cysticercosis of the brain, and cerebral developmental malformations. A CT scan of the head allows the patient to be observed for any of these areas. The principle of head CT diagnosis is to utilize the different absorption coefficients of various tissues in the brain to X-rays, and get different images through electronic computer processing. The thickness of the scanning layer of head CT can be as thin as 1mm, which can show tiny lesions more clearly. Due to the non-invasive test and sensitivity of head CT, it has been widely used for the diagnosis of various neurological disorders in the clinic.