CT angiography of the heart and its difference with angiography

what is CT coronary angiogram?

A computerized tomography (CT) coronary angiogram is an imaging test that looks at the arteries that supply blood to your heart. It might be used to diagnose the cause of chest pain or other symptoms.

A CT angiogram relies on a powerful X-ray machine to produce images of your heart and its blood vessels. These tests are noninvasive and don’t require recovery time. Coronary CT angiograms are increasingly an option for people with a variety of heart conditions.

A traditional (not CT-based) coronary angiogram requires that a flexible tube (catheter) be threaded through your groin or arm to your heart or coronary arteries. If you have known coronary artery disease, your doctor might recommend a traditional coronary angiogram because you can also receive treatment during that procedure.

Why it’s done

A coronary CT angiogram can check your heart for various conditions, but it’s primarily used to check for narrowed or blocked arteries in your heart (coronary artery disease). If your test suggests that you have heart disease, you and your health care provider can discuss treatment options.


You’ll be exposed to some radiation during the test. The amount varies depending on the type of machine used. The risk of developing cancer from a CT angiogram isn’t known, but it’s small. However, you shouldn’t have a CT angiogram if you’re pregnant because of possible harm to your unborn child.

It’s possible that you could have an allergic reaction to the dye used in the procedure. Talk to your doctor if you’re concerned about having an allergic reaction.

How you prepare

Your doctor should give you instructions about how to prepare for your CT angiogram. You can drive yourself to the appointment, and you’ll be able to drive after your test.

1- Food and medication

Usually, you’ll be asked not to eat anything for about four hours before your test. You can drink water, but avoid caffeinated drinks 12 hours before your test, because they can increase your heart rate, which can make it difficult for your doctor to get clear pictures of your heart. If you’re allergic to the dye used in the procedure, your doctor might ask you to take steroid medication 12 hours before the procedure to reduce your risk of a reaction.

2- Clothing and personal items

You’ll need to remove clothing above your waist, as well as jewelry and glasses, and change into a hospital gown.

سی تی آنژیوگرافی - CT angiogram

What you can expect

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

Before the CT angiogram procedure

Your doctor might give you a medication called a beta blocker to slow your heart rate, enabling the scan to produce a clearer image. Let your health care provider 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. If you’re allergic to contrast material, you might be given medication to lower your risk of a reaction.

During the procedure

A technician will give you numbing medication before inserting an intravenous (IV) line in your hand or arm to inject the dye that will make your heart’s arteries visible on the images. 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.

The technician will place electrodes on your chest to record your heart rate. You’ll lie on a long table that slides through a short, tunnel-like machine. During the scan you’ll need to stay still and hold your breath so as not to blur the images. If you’re uncomfortable in closed spaces, ask your Cardiologist if you need medication to help you relax.

A technician will operate the machine from a room that’s separated from your exam room by a glass window. There will be an intercom system that allows you and the technician to communicate with each other.

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.

The images from your CT angiogram should be ready soon after your test. Usually, the health care provider who asked you to have a CT angiogram should discuss the results of the test with you.

Who is CT angiogram suitable for?

In general, adults, children and even babies can undergo a CT angiogram without any adverse effects or complications. However, CTA is more commonly prescribed for adults and is used to scan for a wider range of conditions in adults than in children or babies. CTA may not be suitable for people who are known to be allergic to contrast material.

Doctors may consider using alternative methods to CTA when they are examining people with one or more of the following characteristics:

  • A history of allergic reactions to contrast material
  • Unstable pulse or blood pressure
  • Impaired kidney function

For people who are pregnant and/or who are undergoing radiation therapy to treat other conditions, the decision to prescribe a CT angiogram will be taken by the doctor, in discussion with the affected person, on a case-by-case basis.

Factors which will be taken into consideration include:

  • The type of angiogram
  • The condition(s) to be screened for
  • The cumulative (total) amount of radiation that the individual would be exposed to over the course of the total number of procedures that they are scheduled to undergo which involve radiation
  • Whether the area of the body to be screened includes the womb and/or the unborn child
  • The timeline of the pregnancy: After 15 weeks, the fetus is considered to be sufficiently developed that the risks from the exposure to radiation that a single scan involves are thought to be negligible.


Based on the results of your test, your health care provider will discuss with you whether you have a heart condition that needs treatment, whether you’re at risk of developing heart disease and steps you can take to keep your heart healthy.

Regardless of the results of your test, it’s a good idea to make lifestyle changes to help protect your heart. These include:

  • Exercise regularly. Exercise helps you reach and maintain a healthy weight and control diabetes, elevated cholesterol and high blood pressure — all risk factors for heart disease. With your doctor’s OK, aim for 30 to 60 minutes of moderate to vigorous physical activity most days of the week. If necessary, break your activity into several 10-minute sessions a day.
  • Eat healthy foods. A heart-healthy diet based on fruits, vegetables and whole grains — and low in saturated fat, cholesterol and sodium — can help you control your weight, blood pressure and cholesterol.
  • Stop smoking. Smoking is a major risk factor for heart disease, especially atherosclerosis. If you smoke, quitting is the best way to reduce your risk of heart disease and its complications.
  • Maintain a healthy weight. Excess weight can contribute to high blood pressure, abnormal cholesterol levels and type 2 diabetes. Losing weight, even a small amount, lessens these risks.
  • Manage health conditions. If you have high blood pressure, elevated cholesterol or diabetes, take your medications as directed. Ask your doctor how often you need follow-up visits.
  • Manage stress. Stress can cause your blood vessels to constrict, upping the odds of a heart attack. Ask your doctor about stress management programs in your area. Exercise can help reduce stress too.




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