The difference between coronary angiography and coronary CT includes the method of operation, degree of accuracy, and predictive value. Coronary CT is an intravenous injection of a small dose of contrast material that is passed through the CT to take a picture, and then adjusted to observe the narrowing of cardiac blood vessels and calcification of the wall of the tube. Compared with coronary angiography, it is economical, simple and less risky, but the prediction of coronary stenosis is not as accurate as coronary angiography. It has a high negative predictive value and is mostly used to rule out coronary artery disease. Coronary angiography is an interventional procedure in which a contrast agent is injected into the artery and the coronary artery is visualized. As an invasive test, coronary angiography is more expensive and risky than coronary CT. However, it has a higher positive diagnostic value and is more predictive of the extent and nature of plaque within the coronary wall than coronary CT. Both tests should be selected by the doctor according to the patient’s own condition. If you have allergy to iodine and other contrast agents or renal insufficiency, please inform the doctor before the test. Please follow your doctor’s instructions for specific selection.