MRI can examine the blood vessels in the brain, and it has two types of examination, one is cerebral angiography with MRI, and the other is cerebral angiography with MRI. The former can show the blood vessels alone without using contrast, and it can show the large blood vessels in the area where it is done as well as the relatively large side branches, and it is mainly used for general screening of vascular lesions, for example, it can determine whether the patient has intracranial aneurysm or problems such as cerebrovascular malformations. The latter is a cerebrovascular angiogram, which requires the use of contrast agents and is generally used to diagnose cerebrovascular diseases as well as tumor diseases in the brain, but there is a certain chance that the patient will be allergic to the contrast agent, so the doctor will decide which one to choose based on the patient’s specific situation.