Patients who undergo cerebral angiography alone are hospitalized for only 3-5 days, while those who need interventional treatment are hospitalized for a relatively longer period of time. Cerebral angiography, also known as digital subtraction angiography (DSA), is a procedure in which a contrast agent containing iodine is injected into the cerebral vessels that need to be visualized to get a clear picture of the specific conditions of the vessels. With the continuous development of DSA technology, it has become an important diagnostic method for cerebrovascular diseases, and even the “gold standard method”. However, because the test is invasive, it requires hospitalization. If the patient is simply looking for clarification of vascular conditions, a hospital stay of 3-5 days is usually sufficient. If the patient also undergoes a series of interventional procedures during the examination, the length of hospital stay will be extended according to the condition. Before the DSA procedure, the patient needs to fast, empty the urine and stool, relax and cooperate with the doctor during the procedure.