The specific time required for an MRI cannot be generalized and is related to the specific area to be examined. MRI is a kind of imaging means using the cause of nuclear magnetic resonance, which has the advantages of higher resolution, more imaging parameters and faster scanning speed, and can more accurately reflect the human central nervous system, head and neck, abdomen, urinary tract, limbs and bones. The time required for this examination is mainly related to the examination area, about 10-20min for plain scan and about 30min for enhancement. Patients who need to perform Popper analysis for breast and prostate enhancement examination will take longer, about 1h. MRI has no radiation and no adverse effects on the body, so it is relatively safe and reliable. Patients have to remain still during the examination. During the examination, the machine will make loud noises from time to time, but they are generally tolerable.