Carotid angiography has CT angiography (CTA) and digital subtraction angiography (DSA). The price of CTA is around $1,000 and the price of DSA is around $5,000. 1. CTA: Angiographic agent is injected into the blood vessel, and the image result is processed in three dimensions after CT scanning. Generally, the cost including the contrast agent is around 1000 RMB. This test is relatively less invasive and safer than DSA, but the results are less accurate than DSA. 2. DSA: A guide wire catheter is inserted through a puncture in the femoral or radial artery, and a contrast medium is injected into the target location and visualized by a digital imaging machine. The general price includes the cost of the contrast agent, the cost of the guidewire catheter, and the cost of the basic procedure, which is about 5,000 RMB. The results of DSA are clearer than those of CTA, and can detect some smaller lesions. CTA and DSA are common tests for vascular disease, and DSA is often recognized as the “gold standard” for diagnosing vascular disease because it can accurately and comprehensively show the structure of blood vessels and the location of specific lesions.