Vascular CT examination refers to CTA. CTA is mainly performed by injecting contrast into blood vessels with a high-pressure syringe, then CT scanning, and getting the three-dimensional structure of blood vessels through post-processing 3D image processing, and the processed images can also be enlarged, reduced, and rotated, which is more helpful for the size of the values that need to be measured later in the clinic, as well as for the development of surgical plans. CTA as a non-invasive examination means It can examine many vascular lesions, including coronary arteries, carotid vessels, pulmonary arteries, large vessels in the chest and abdomen, and arteries in the upper and lower extremities, etc. For example, if CTA of cerebral vessels is done, it can observe whether there is stenosis in cerebral vessels, the location of stenosis and the degree of stenosis, and it can observe whether there are aneurysms and arteriovenous malformations, etc. Cardiovascular CTA examination is mainly to see the site and degree of coronary artery stenosis and whether there is any developmental malformation, etc.; pulmonary CTA examination is generally referred to as pulmonary artery CTA examination, which is mainly used to observe whether there is pulmonary artery embolism, etc. CTA examination of large blood vessels in the chest and abdomen can detect aneurysm, arterial coarctation, and aortic wall interstitial hematoma. For patients with acute chest pain, there is also the option of a one-stop chest pain triad CTA examination, which is a relatively easy and quick way to clarify the causes of acute chest pain of cardiovascular vascular origin, including acute coronary syndrome, acute aortic syndrome and pulmonary artery embolism. The greatest advantage of this test is that it saves time, mainly because it can provide a lot of information needed by clinicians through a single examination, providing a timely and reliable basis for the diagnosis of the cause of acute chest pain and the selection of treatment methods for patients with acute chest pain.