There are no side effects of having an MRI, MRI is imaging through a magnetic field and does not have any radiation effects, so there is no damage to human tissues and it is safer. However, compared with CT, MRI takes a longer time to do, which may be around 15-20 minutes. MRI is a commonly used test in clinical practice, and is widely used in the diagnosis and differential diagnosis of cerebrovascular diseases, cerebral demyelinating diseases, brain tumors, cranio-cerebral trauma, cranio-cerebral congenital developmental malformations, and intracranial infections due to various causes, as well as cerebral degenerative diseases. MRI can also show lesions of the spinal cord, and is more advantageous for the diagnosis of lesions of the spinal cord, such as spinal cord tumors, myelitis, spinal cord cavernous disease, and lumbar intervertebral disc herniation can be diagnosed. MRI can also visualize new brain infarctions in less than 2 hours.