For cerebral hemorrhage, CT examination is chosen in most cases, mainly for the following reasons: 1, cerebral hemorrhage is an acute disease, which often has an acute onset and is more critical, and MRI examination often cannot be performed in an emergency situation; 2, the examination time of MRI is relatively long, and often requires that the patient’s head cannot be moved; if the patient is not conscious, once the head is moved, the image will be very MRI is a method of diagnosing brain tissue and intracranial lesions using magnetic fields. The signal of brain hemorrhage varies widely under magnetic fields, and the signal of brain hemorrhage on MRI varies within a few hours, one day, or 1-3 days, or 3-7 days. It is difficult to make an accurate diagnosis by choosing to perform an MRI if you cannot tell in advance whether it is a brain hemorrhage or another disease. For patients with brain hemorrhage, CT examinations are often preferred. Because CT is very sensitive to the determination of bleeding, and because CT is quick and safe, it should be the first choice of examination for patients with emergency brain hemorrhage. However, for some special patients, MRI can also be chosen.