With the development of imaging technology, coronary CT has become one of the main examination means for coronary heart disease. Coronary CT examination is to let the patient under the CT machine, through the injection of contrast agent for angiography to obtain images, and then through the post-processing of the doctor on the workstation, you can get the vascular images of the coronary arteries to diagnose the coronary heart disease. Now some patients have some misunderstandings about whether to perform coronary angiography, we will talk with you. What kind of people are suitable for coronary CT? Some people have risk factors for coronary artery disease, such as middle-aged and elderly men, postmenopausal women, long-term smoking history, long-term hypertension, diabetes, hyperlipidemia history, such people have a high incidence of coronary artery disease, can perform coronary CT examination. In addition, if patients have symptoms of chest pain, chest tightness and discomfort and positive ECG exercise stress test, coronary CT examination can also be performed. Coronary CT can have the following diagnoses: no clear stenosis and plaque in the coronary arteries, mild lumen narrowing, moderate lumen narrowing, severe lumen narrowing or even lumen occlusion. The more severe the coronary lesion, the higher the risk level of the patient is suggested. Patients with moderate to severe stenosis are recommended to undergo coronary arteriography and intervention as appropriate. But is the stenosis reported by coronary CT accurate compared to coronary angiography? The degree of stenosis reported by coronary CT is an estimate determined by the physician based on the software, and some of the coronary CT results are different from the coronary angiogram. This is not to say that coronary CT results are meaningless, but rather that the different imaging principles of coronary CT and angiography are responsible. Coronary angiography is direct imaging, and direct imaging results are more accurate. Coronary CT is indirect imaging and may have a degree of error in the diagnostic results compared to the real situation. Coronary CT is also minimally invasive because it requires an indwelling intravenous sheath to inject the contrast medium. So there are a few things to keep in mind when doing coronary CT: one is allergic reactions. Contrast agents can cause allergic reactions in a very small number of people, mostly skin rashes, etc., which can be improved with appropriate treatment. And those with severe symptoms may have anaphylaxis, so it is best to observe for half an hour to an hour after the examination before leaving to avoid serious conditions. It is also recommended to drink as much water as possible after the examination, which can promote the discharge of the contrast agent. Coronary CT is operated under radiation and should be avoided as much as possible for women of childbearing age with recent fertility needs, women during pregnancy, etc. Radiation damage from radiation is reduced. For coronary artery disease, coronary CT is a relatively easy and economical test, but it cannot replace coronary angiography as the “gold standard” test. If you have complaints of chest pain and discomfort, consult your doctor promptly and he or she will select the appropriate test for you according to your specific situation.