MRI has a wide range of examinations and is mainly used as an adjunct to the examination of central nervous system diseases, such as brain and spinal cord diseases. It has significant advantages over CT for lesions in the posterior cranial fossa, such as the brainstem and cerebellum, and for diseases of the spinal cord and soft tissues, such as intervertebral discs. MRI also allows for non-invasive magnetic resonance brain venography and cerebral artery imaging. In the bone and joint area, MRI can observe the meniscus and anterior and posterior cruciate ligaments for damage, which is a significant advantage over CT.