In CT Angiography (CTA), computed tomography using a contrast material produces a contrast material to produce pictures of blood vessels of the heart.

Physicians use the procedure to:

1. Show the extent and severity of atherosclerosis in the coronary arteries
2. Guide surgeons making repairs to diseased blood vessels, such as implanting
   or evaluating a stent
3. Plan for a surgical operation, such as coronary bypass
4. Screen individuals for arterial disease, especially patients with a family history of arterial disease or disorders

You should wear comfortable, loose-fitting clothing to your exam. You may be given a gown to wear during the procedure.

Metal objects including jewelry, eyeglasses, dentures and hairpins may affect the CT images and should be left at home or removed prior to your exam. You may also be asked to remove hearing aids and removable dental work.

You may be asked not to eat or drink anything for several hours beforehand, especially if a contrast material will be used in your exam. You should inform
your physician of any medications you are taking and if you have any allergies, especially to contrast materials.

Also inform your doctor of any recent illnesses or other medical conditions,
and if you have a history of heart disease, asthma, diabetes, kidney disease
or thyroid problems. Any of these conditions may increase the risk of an unusual adverse effect.

Women should always inform their physician or technologist if there is any possibility that they are pregnant.