Computerized tomographic angiography, also called non-invasive CT angiography, is a radiological test that has both the technology of a conventional CT scan accompanied by that of traditional angiography that provides detailed images of the blood vessels in the body.

CTA can determine the status of both the large arteries and veins in most parts of the body, including the brain. The test involves the use of x rays that show numerous sectional images that are then reconstructed by a computer into 3 dimensional pictures.