Cerebral angiography is a method of diagnosing cerebrovascular disease by injecting an iodine-containing contrast agent into the arteries to visualize the vessels, taking rapid and continuous films, and diagnosing cerebrovascular disease based on the morphology and location of the vessel visualization. Cerebral angiography is clinically divided into carotid angiography, vertebral arteriography, whole brain angiography and venous sinus angiography due to different administration sites. Cerebral angiography can show both the morphological changes of the vessels themselves, such as dilatation, malformation, spasm, stenosis, infarction, hemorrhage, etc., and determine the presence of occupancy according to the changes in the location of the vessels. Therefore, it has special significance in diagnosing lesions of the intracranial vessels themselves. The indications mainly include the following: 1. Intracranial vascular lesions (1) Hemorrhagic: subarachnoid hemorrhage, intracranial aneurysm, carotid artery aneurysm, vertebral artery aneurysm, arteriovenous malformation, dural arteriovenous fistula, carotid cavernous sinus fistula, Galen’s vein aneurysm, cavernous hemangioma, intracranial venous vascular malformation. (2) Ischemic: intracranial and intracarotid system artery stenosis (anterior cerebral artery, middle cerebral artery, carotid artery, vertebral artery, basilar artery stenosis), intracranial vein or venous sinus thrombosis, smog disease. 2, intracranial tumors meningioma, vascular reticulocytoma, jugular venous bullae tumor, glioma 3, head and neck vascular tumors nasopharyngeal fibrovascular tumor, carotid body tumor.