What you can expect

CT angiograms are usually performed in the radiology department of a hospital or an outpatient imaging facility.

Before the procedure

You may receive a medication called a beta blocker to slow your heart rate. Doing so provides clearer images on the CT scan. Let your doctor know if you've had side effects from beta blockers in the past.

You might also be given nitroglycerin to widen (dilate) your coronary arteries. The CT scan may be done using contrast, a dye to help your blood vessels show up more clearly. If you're allergic to contrast material, you might be given medication to lower your risk of a reaction.

During the procedure

You'll receive numbing medication, and then the technician will insert an IV into your hand or arm. The dye flows through this IV. You'll also have sticky patches called electrodes placed on your chest to record your heart rate.

You'll lie on a long table that slides through a short, tunnel-like machine (CT scanner). If you're uncomfortable in closed spaces, ask your doctor if you need medication to help you relax.

During the scan you need to stay still and hold your breath as directed. Movement can cause blurry images.

A technician operates the CT machine from a room that's separated from your exam room by a glass window. An intercom system allows you and the technician to talk to each other.

Although the actual scanning portion of the test takes as few as five seconds, it may take up to an hour for the whole process to be completed.

After the procedure

After your CT angiogram is completed, you can return to your normal daily activities. You should be able to drive yourself home or to work. Drink plenty of water to help flush the dye from your system.