Carotid angiography is a minimally invasive procedure, and any procedure has certain risks, but carotid angiography is now very common in clinical practice, and basically hospitals with imaging departments have thousands of carotid angiograms every year, and even a few hundred cases, so it is a very mature procedure and the risks are actually very small. Any test has certain risks, so it is not necessary to worry too much about the risks of carotid angiography. Carotid angiography is the gold standard for observing carotid artery stenosis. It is the best way to determine the site, length, and degree of carotid artery stenosis as well as the blood flow in the carotid artery, so carotid angiography is still recommended for patients with symptoms.