Angiography uses a machine called a C-arm. Usually, a catheter is inserted into the region of interest from a thick blood vessel somewhere in the body, then a contrast agent is injected, and the development of blood vessels is observed under X-ray.
So the difference is: First, the machines are different. Second, the positional relationship between the operator and the patient is different (the operator and the patient of CT are not in the same room, and the contrast agent is exposed to X-rays next to the patient and needs to wear protective equipment). The third enhanced CT can be considered as non-invasive (although intravenous drugs are needed), while angiography is invasive. Fourth, the purpose of observation is different. Generally, enhanced CT is to observe the blood supply of the lesion, such as a lump, whether the density of the lump rises after taking medicine, whether the density is uniform, etc., while angiography is to observe the blood supply of the lump, such as which blood vessel supplies blood. Of course, CTA examinations such as CTV also use enhanced CT to observe blood vessels. Fifth, the subsequent medical behavior is different. Contrast-enhanced CT is generally for the purpose of simple diagnosis, while angiography is usually accompanied by synchronous treatment (such as cardiac stent implantation, tumor embolization, etc.). )