CTA of the brain, clinically known as CT cerebral angiography, is a test that uses CT to examine the condition of the blood vessels in the brain, and is mostly used clinically to evaluate the condition of the blood vessels in the skull. CTA of the brain is one of the clinical tests, also known as angiography of the cerebral vessels, which is mostly used to assess the condition of intracranial blood vessels. It can be used to check whether the patient has atherosclerosis, the degree of atherosclerosis, and the degree of narrowing of blood vessels, and whether there is plaque formation. To perform a CTA of the brain, the patient is given an intravenous contrast agent, which is administered through the vein and travels through the bloodstream, where the contrast agent flows into the arteries and can be scanned and imaged. CTA of the brain can also have a certain degree of radiation, and at the same time need to use with the contrast agent, individual patients may be allergic to the contrast agent, it is recommended that patients under the guidance of the doctor to choose the CTA of the brain examination.