Cranial magnetic resonance tomography is the most accurate and effective examination method to check cranial diseases, which can mainly check the following diseases: i. Cerebral thrombosis, which can show more characteristic changes on magnetic resonance, and can be determined to be related to thrombotic diseases. Brain hemorrhage, brain hemorrhage in different periods, there are specific changes on MRI, which can confirm the diagnosis of brain hemorrhage. Brain tumor, if there is a primary tumor or metastatic tumor in the skull, the size of the tumor, the number of tumors and whether the tumor is compressing the brain tissue to produce edema and other changes of the tumor can be found on the cranial MRI scan. Intracranial aneurysm, if the aneurysm is gradually increasing in size in the brain, it can be found on the magnetic resonance imaging scan that there are flowing hollow-like and round structures, which can detect brain aneurysm. V. Multiple sclerosis, also known as demyelinating disease. This disease is recurrent and produces intracranial sclerotic patches with unique imaging changes. VI. Intracranial subdural and epidural hematomas, which are often acute or chronic subdural or epidural hematomas caused by rupture of subdural or epidural vessels resulting from head trauma, leading to a reaction of compressed intracranial brain tissue. Seven, cerebral cysticercus, cerebral cysticercus disease can produce multiple nodular changes in the skull, and the head nodes of cerebral cysticercus can be found, which can determine whether it is cerebral cysticercus.