CT Angiography, Neck and Chest Vessels — With or Without IV Contrast

What is this test?

CT angiography, or CTA, is an imaging study that uses computed tomography to examine blood vessels. Images may be taken before and after iodinated contrast is given through a vein, depending on the protocol and the reason for the examination.

Why might I need this test?

CTA may be ordered to investigate symptoms such as neck or chest pain, shortness of breath, dizziness, or weakness. It can help clinicians evaluate blood flow and look for narrowed or blocked arteries, aneurysms, dissections, or blood clots.

How is the test performed?

You lie on a CT table while the scanner takes several pictures. If contrast is used, it is injected through an intravenous line, and the scan may include images before and after the injection. The procedure is generally painless, although the contrast may cause a brief warm or flushing sensation.

How do I prepare for the test?

Follow the instructions provided by the imaging center. Fasting may or may not be required. Tell the care team if you have had a reaction to iodinated contrast, have kidney disease, are pregnant or may be pregnant, or take medicines such as metformin, because these factors may affect the protocol.