Generally, the degree of dizziness, accompanying symptoms, and the patient’s condition are needed to determine whether to examine brain CT or brain MRI. If the patient, in addition to dizziness, has obvious headache, nausea, projectile vomiting, etc., it is recommended to check the cranial CT to exclude cranial hemorrhagic disease. If the patient, in addition to dizziness, has ataxia, choking on water, unsteady walking, nystagmus, dysphagia, etc., it is suspected that cerebral ischemic lesions, and it is recommended to carry out a cranial magnetic resonance examination. If the patient has rotated vision during the dizziness attack, posterior circulation ischemia may be present, and then cranial MRI is necessary, as CT examination has a low positive diagnostic rate for posterior circulation disease. MRI scanning takes a long time, usually about ten minutes, and requires a high level of patient cooperation. A general scan of the head basically takes only a few minutes or so; CT is preferred if the patient is restless or has difficulty cooperating. If there are any uncomfortable symptoms, you need to go to the hospital as soon as possible, the doctor according to the specific conditions, to develop individualized diagnosis and treatment plan, so as not to delay the condition.