Cardiac CT, i.e., coronary CTA, has a high negative predictive value and a limited positive expected value. That is, it is able to rule out coronary vascular disease, but it is not able to accurately determine the coronary artery status of coronary artery disease in the presence of coronary artery lesions such as blockage. When the patient has chest tightness, chest pain and other discomfort, electrocardiogram examination has ST segment depression, T wave inversion and other changes, or the patient’s symptoms are not typical but suspected of coronary artery disease, you can do coronary CTA examination to determine whether the patient has coronary artery disease. In order to avoid the delay of the condition, if there is any discomfort, we should consult the doctor in time, and give appropriate examination and treatment under the doctor’s guidance, and the specific diagnosis and treatment should follow the doctor’s instruction, do not use medicine by yourself.