The difference between coronary CT and coronary angiography is mainly the difference in examination method, examination effect and indications. 1. Different examination methods: coronary CT is a non-invasive examination method, directly scanning the coronary arteries with CT instruments; while coronary angiography is an invasive examination, requiring puncture, radial artery, femoral artery and even brachial artery, injecting contrast medium, and then carrying out the radiography, which is relatively painful for the patient. 2. Different examination results: coronary angiography is the gold standard, the clarity of the examination results is better than coronary CT. coronary CT is not clear, but it also has the advantage of being able to show the coronary arteries in addition to the condition of the coronary arteries, but it can also show other abnormalities in the heart. Some things that cannot be seen in coronary angiography can be clearly shown on CT films. 3. Different suitability: Coronary CT is generally recommended for young or suspicion-negative patients, patients who are allergic to the contrast agent and cannot undergo coronary angiography, etc. Coronary angiography, on the other hand, is suitable for patients with highly suspected coronary artery stenosis and other lesions. If you suspect that there is a lesion in the coronary artery, you should choose the appropriate method of examination under the guidance of your doctor, and do not make the choice arbitrarily on your own.