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Coronary Computed Tomography Angiogram (Coronary CTA)
Non-Invasive Evaluation of Cardiac Anatomy and Function
CARDIOVASCULAR IMAGING RESEARCH

What is computed tomography?
Computed tomography, commonly known as a CT or CAT scan, is a test that uses x-rays and computers to produce cross-sectional images of the body. CT has been used for over 25 years to examine all parts of the body.

What is coronary computed tomography angiogram?
A coronary computed tomography angiogram (CTA) uses advanced CT technology, along with intravenous (IV) contrast material (dye), to obtain high-resolution, three-dimensional pictures of the moving heart and great vessels.

CTA is also called multi-slice computed tomography (MSCT), cardiac CT or cardiac CAT. During CTA, x-rays pass through the body and are picked up by detectors in the scanner, which produce 3D images on a computer screen. These images enable physicians to determine whether plaque or calcium deposits are present in the artery walls.

CTA is being studied as a noninvasive method for detecting blockages in the coronary arteries. A CTA can be performed much faster (in less than one minute) than a cardiac catheterization, with potentially less risk and discomfort as well as decreased recovery time.

What is cardiac catheterization?
Currently in clinical practice, an invasive imaging procedure called cardiac catheterization (cath) is the standard method for diagnosing coronary artery disease.

During a cardiac cath, a long, slender tube— called a catheter—is inserted through a blood vessel in the leg or arm and guided into the heart with the aid of a special x-ray machine. A small amount of contrast material is injected through the catheter and into the arteries and heart. As the heart beats, the contrast material outlines the vessels, valves and chambers and photographs are taken to expose blockages or narrowed areas in the coronary arteries.

The average catheterization procedure lasts about 30 minutes, but the preparation and recovery time add several hours. Most patients are at the hospital all day for this test.

On the day of the CTA test

  • For 4 hours immediately before your test, take nothing by mouth. You may take your medications with a small amount of water.
  • Please plan to arrive at Desk F17 — 15 minutes before your scheduled appointment time so your test can be completed on schedule.

Who performs the test?
Registered and licensed technologists perform the scan, and board-certified cardiologists and/or radiologists review the results.

During the test
  • A contrast material will be injected into your vein so the radiologist can view the heart and blood vessels on the CT image.
  • After the contrast agent is injected, you may feel flushed, or you might have a metallic taste in your mouth. These are common reactions. If you experience shortness of breath or any unusual symptoms, please tell the technologist.
  • The technologist will help you lay in the correct position on the examining table, with your arms raised over your head.
  • It is very important that you lie as still as possible during the entire procedure. Movement could blur the images. You may be asked to hold your breath briefly at intervals when the images are taken.
  • The table will automatically move into place for imaging. The table moves in and out of a donut shaped scanner. The x-ray tube circles the body for 5-8 seconds.
  • The detector array records the x-rays. Each complete loop of the scanner creates a spiral image of the heart. The scanner’s computer processes the images, creating a high-resolution, 3-D image when the test is complete.

After the test
Generally, you can resume your usual activities and normal diet immediately after the test.

For additional information about participating in CTA research and/or resources regarding CTA or other cardiovascular topics, please call The Cleveland Clinic Heart Center Resource & Information Nurse at 216-445-9288 or toll-free at 866-289-6911. Hours are 8:30 a.m. to 4 p.m. Monday through Friday on regular workdays — Or contact by email using the Contact Us Form.

Cardiovascular Imaging Research The Cleveland Clinic has one of the largest and most experienced cardiac imaging centers in the country. The CT Research Group is currently investigating the potential role of CTA in patients diagnosed with coronary artery disease, valve disease and other cardiac conditions. In addition, the CT Research Group is studying bypass grafts and evaluating the results of positive stress tests.

The results of both 40-slice and 64-slice CT scanners are being investigated. The best use of these scanners continue to be refined by only a few leading cardiovascular centers in the country.

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©Cleveland Clinic Foundation, revised 10/05
 
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This information is provided for education purposes only and is not intended to replace the medical advice of your doctor or health care provider. While we strive to keep our website current, medical practices sometimes change quickly. Please consult your health care provider for advice about a specific medical condition or contact the Cleveland Clinic if you would like an appointment.