Head MRI can detect early brain infarction in patients, and in particular, diffusion-weighted imaging of MRI can be used for the early diagnosis of ischemic cerebrovascular disease. Ischemic changes can be detected within 2 hours of patient onset, with the lesion area showing high signal on diffusion-weighted imaging. MRI is superior to head CT in diagnosing cerebral infarction diseases. Head MRI is widely used in clinical practice for the diagnosis and differential diagnosis of cerebrovascular diseases, such as cerebral infarction, cerebral hemorrhage, demyelinating diseases, brain tumors, congenital developmental malformations of the skull and brain, cranial trauma, or intracranial infections from various causes, as well as brain degenerative diseases. MRI of the head shows lesions in the brainstem and posterior cranial fossa more clearly and has advantages over CT.