Coronary CT is done to check whether there is any narrowing of the coronary arteries of the heart, as well as the degree of narrowing and the absence of developmental malformations. It takes about 5 minutes to complete the test, just like a normal CT test, while lying on the CT bed. However, the difference with normal CT is that when doing coronary CT, an intravenous contrast agent, usually iodine contrast agent, such as iohexol and Uvexan, is injected into the body to develop the coronary arteries through the contrast agent, and then the coronary arteries are processed by computer to obtain a complete image of the coronary arteries. Coronary CT is dangerous and may cause allergic reactions, so usually the test needs to be accompanied and signed by a family member. Coronary CT is a non-invasive test that is currently used clinically to clarify the diagnosis of coronary artery disease and the severity of coronary stenosis in patients with coronary artery disease, so as to assess the risk and prognosis of coronary artery disease and provide an important reference basis for the next clinical treatment. Patients with hypertension and hyperlipidemia who are at risk of coronary artery disease and myocardial infarction can also undergo routine coronary CT physical examination. If problems in the coronary arteries are detected early, early intervention treatment can be performed.