MRI has no radiation and is a relatively safe imaging method, which utilizes the movement of a large number of hydrogen nuclei in the body under the action of an applied magnetic field, and is a kind of imaging examination method, different from the radiation and CT examination that utilizes X-rays, so infants and young children can also undergo this examination, and pregnant women after the third trimester of pregnancy can also undergo this examination. There is no radiation in MRI, but the examination time is relatively long, and there will be relatively loud noise during the examination, and the requirements for the patients are relatively high. Patients who have metal foreign objects in their bodies, wear metal objects, and are in a coma and can’t cooperate with the examination are generally not suitable for MRI. Therefore, it is necessary for the doctor to decide whether the patient is suitable for MRI according to the patient’s specific situation.