Brain CT and MRI are both methods of imaging the brain, and both are more commonly used in the clinic. Brain CT is faster and more sensitive to fresh hemorrhage, and can detect cerebral edema, increased intracranial pressure, cerebral hernia, and has a higher diagnostic accuracy for cerebrovascular diseases. Magnetic resonance is an effective examination method for brain diseases, which can detect tumors, cerebral infarction, cerebral hemorrhage, cerebral abscess at an early stage, and can also determine hydrocephalus. Compared with CT, MRI has no ionic radiation, which causes less harm to the human body, and the diagnosis of localization is more accurate, and it is accurate in the diagnosis of cerebral white matter degeneration, cranial base, and posterior cranial fossa lesions, and patients who are equipped with cardiac pacemakers, have metallic foreign objects in the eyeballs or in the body, or have particularly critical conditions cannot have MRI examinations. Patients with cardiac pacemakers, metal foreign bodies in the eyeballs or body, or in particularly critical conditions cannot undergo magnetic resonance examination, and reasonable examination methods should be selected according to the specific conditions of the patients.