The diseases that can be examined by MRI are as follows: a. Diagnosis of occupying head lesions. For cerebrovascular diseases of the head, such as cerebral infarction or cerebral hemorrhage, MRI can perform magnetic sensitivity imaging for cerebral hemorrhage examination. For the diagnosis of central infectious diseases, such as encephalitis and meningitis, MRI can be used for preliminary examination. Fourth, MRI can carry out soft tissue examination, such as MRI examination after soft tissue damage in the neck. V. MRI can examine the knee joint, cartilage in joint parts and other injuries, such as meniscus, and can make a diagnosis. VI. Diagnosis can be made for cranio-cerebral injury, and the degree of damage to the patient can be assessed, etc. VII. MRI of cerebrovascular imaging can make a preliminary assessment of cerebrovascular conditions and diagnose the presence of stenosis, occlusion and malformation.