Brain imaging should be encephalography, which means cerebral angiography. Because blood vessels throughout the body are connected, cerebral angiography involves puncturing one of the body’s arteries, such as the femoral artery or radial artery, in a catheterization chamber and placing a vascular sheath, inserting a contrast catheter through the sheath to reach the arch of the aorta, and then the catheter can be inserted into the bilateral subclavian arteries and bilateral common carotid arteries to inject a contrast medium through the catheter and visualize the entire cerebral vascular structure. It is the most important examination for understanding cerebrovascular lesions, which can understand whether there is any stenosis, vascular occlusion, thrombus, aneurysm, etc. The main indications of cerebral angiography are cerebral infarction, suspected cerebral artery stenosis, arterial thrombolysis and thrombolysis treatment for acute cerebral infarction, subarachnoid hemorrhage, or cerebral hemorrhage suspected of aneurysm patients. However, this test is invasive and involves puncturing the artery. Renal insufficiency is contraindicated because the contrast agent may aggravate renal damage.