Electron-beam computed tomography (EBCT) is a fast and sensitive test for detecting calcium build-up in the arteries of the heart. It uses an electron gun instead of regular x-rays to scan the chest.

The amount of calcium build-up in the arteries will give your doctor an idea of whether a condition known as atherosclerosis has developed. This condition can lead to narrowing of the arteries, heart attack, stroke, and other serious conditions.

Varying Degrees of Atherosclerosis in Coronary Arteries
Stereostatic Biopsy

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Reasons for Test

EBCT may be used to screen people for coronary artery disease (CAD). It can be used before or after symptoms actually appear. This test may be most useful for people at moderate risk for heart attacks. This is important because, for many people, the first sign of CAD is a heart attack.

Coronary Artery Bypass Graft
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Possible Complications

An EBCT is considered a low risk procedure and uses very low amounts of radiation. Despite this, women should let their doctor know if they are pregnant.

Some may also have an allergic reaction to dyes or contrast material used to enhance the images. Let your doctor know about any allergies you may have.

What to Expect

Prior to Test

Your doctor will discuss your health and medical history, including any risk factors you have for CAD. This will help your doctor determine if EBCT screening is right for you.

Description of Test

You will be asked to lie down on a padded table under an arch-shaped scanner. You may remain clothed and your head will not be enclosed at any time. The scanner moves over your body and takes pictures of your internal organs. During the scan, you will be asked to hold your breath at times to help you remain motionless. A radiographer who runs the scan will be with you to answer any questions or concerns.

After Test

You will be able to leave after the test is done.

How Long Will It Take?

The procedure takes about 10-15 minutes. The actual scanning time is only a few seconds.

Will It Hurt?



The EBCT software measures the calcium deposits in your arteries. This is called the calcification score. Depending on your score, your doctor will discuss any measures you should take to decrease your risk of CAD, such as exercising more or taking medication. Your doctor may also recommend more testing or surgery if your score is very high.

Call Your Doctor

Call your doctor if you have any questions about the test, your condition, or your test results.

If you think you have an emergency, call for emergency medical services right away.


National Heart, Lung, and Blood Institute

Radiology Info—Radiologic Society of North America


Canadian Society for Vascular Surgery

Heart and Stroke Foundation of Canada


Cardiac CT for calcium scoring. Radiology Info—Radiological Society of North America website. Available at: Updated January 20, 2018. Accessed March 1, 2018.

Coronary calcium scan. National Heart, Lung, and Blood Institute website. Available at: Updated March 30, 2012. Accessed March 1, 2018.

Ultrafast CT scan. University of Rochester Medical Center website. Available at: Accessed March 1, 2018.

Last reviewed March 2018 by EBSCO Medical Review Board Michael J. Fucci, DO, FACC  Last Updated: 5/2/2014