Whether an MRI is necessary depends largely on the patient’s specific situation. If the doctor wants to determine if there is an acute cerebral ridge, nerve compression due to cervical or lumbar spine disease, or if there is a tumor of the biliary system, the patient will need an MRI. MRI has unique advantages in certain areas of examination, such as head, abdominal, vascular, nerve, breast, and soft tissue diseases, and is capable of performing special imaging, such as MRI angiography and MRI pancreaticobiliary imaging, without radiation, and can be performed on pregnant women and children. If the patient is just looking for a simple physical examination, there is no need for an MRI and can start with relatively simple tests such as ultrasound and radiography.