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Coronary Computed Tomography Angiography

A coronary computed tomography (CT) angiography is a simple, non-invasive method of examining the coronary vessels that supply blood to your heart. This exam is quick and painless with very specific results. Plus, coronary CT angiography requires very little preparation and no recovery time compared to traditional angiography. Read this article to learn how coronary CT angiography compares to conventional angiography.

Coronary CT angiography can discover signs of early or significant heart disease that would be undetectable on other heart imaging tests. It detects both calcified (hard) plaque and noncalcified (soft) plaque. It is these soft plaque deposits, often invisible to standard imaging tools, that are more likely to break away and cause heart attacks or more significant health issues.


After we receive your CCTA referral form, we will contact you to schedule your appointment, ask you some important questions, and provide medication and preparation instructions, such as:

  • You will need to have had an electrocardiogram (ECG) within the three months prior to your exam. If you haven’t, your health care practitioner will need to order one prior to your appointment.
  • You will need to have a blood test to determine your kidney function within three months of your appointment.
  • Please refrain from taking erectile dysfunction medications (Viagra or Cialis) in the 48 hours prior to the procedure.
  • Avoid all caffeine products (e.g., coffee, tea, chocolate, Excedrin, decaf coffee, decaf tea) in the 24 hours before your test.
  • If prescribed, please remember to take one tablet (100 mg) of your Beta Blocker the night before your exam. You may be asked to take an additional Beta Blocker one hour before your exam.
  • Take all regular medications (except diabetes medication) the morning of your exam, with water.
  • Avoid strenuous exercise the morning of your exam.
  • No food or drink (except water) in the two hours before your exam. If you have diabetes, you can have dry toast and juice.
  • Please arrive 60 minutes before your appointment to allow enough time for adequate preparation.
  • Bring photo identification and your provincial health card.
  • Wear comfortable clothes.
  • Please do not bring children who require supervision.


  • You may be asked to change into scrubs.
  • A nurse will take your blood pressure and note your heart rate. If your heart rate is too high to obtain clear pictures of your coronary arteries, you will be given another Beta Blocker. It may take a few minutes for the Beta Blocker to lower your heart rate; during this time the nurse will start an intravenous (IV) line for the CT contrast solution and you will be able to relax in a quiet room.
  • In the scanning room, one of our technologists will position you comfortably on the scanner table and attach heart-rate monitor leads to your chest and arms to identify the precise moment for imaging – the fraction of a second between heartbeats.
  • Your technologist will leave the room to begin your exam, but you will be in direct communication throughout your procedure.
  • Your exam has four parts:
    1. Your technologist will take test images to ensure you are in the best position for the scan. We use an automatic injector that delivers contrast solution to your IV to coincide precisely with the scans.
    2. Your calcium score is taken as you are advanced into the scanner and the machine spins around your body. It measures the amount of calcium deposits surrounding your coronary arteries and provides information on your vessel locations.
    3. Prior to the test bolus scan, the nurse or your technologist will spray a little nitroglycerin under your tongue. This dilates the coronary arteries and helps produce clearer images. (You may experience a metallic taste and a warming sensation throughout your body, this is normal.) You will then be moved into the scanner where the machine will take another series of images as the contrast solution is added to your IV. These images will measure how long it takes for the solution to reach your heart vessels and gauge your exact cardiac output.
    4. The last step is the angiogram. You will be advanced into the machine for a final time and a large amount of contrast solution will be added to your IV as the scan begins.
  • At different times throughout your exam, the technologist will ask you to hold your breath for approximately 10-15 seconds while we scan your coronary arteries.


After your scan, we will remove your IV and a nurse will check your blood pressure and heart rate. Once these have returned to normal, you’ll be free to go.


We do our best to have our radiologists interpret the information and forward the results to your doctor in a timely manner.


In Calgary, CT exams are provided at our Mayfair Place location as private pay exams and are not covered by Alberta Health Care. A coronary CT angiography includes a scan of the coronary arteries with contrast and is $1,350.

We offer a 10% Seniors discount (65+) that can be applied to the total CT exam.

Your health spending account or group medical insurance plan may cover the cost of a private CT that is prescribed by a qualified health care practitioner. You will need to check with your plan administrator for coverage details.


Please ensure that you bring your requisition with you to your appointment.


Exam: 15-20 minutes
Appt: 1-2 hours
Do I need a doctor's referral?
Yes, all diagnostic and preventative screening CT exams (including those part of Mayfair's Health Assessment packages) require a referral from your health care provider. You can download a referral form on our website.
Is a preventative screening CT scan right for me?
Most physicians endorse routine screening beginning at age 50. Screening should begin earlier (usually at age 40) for patients with one or more risk factors: a family history of colon cancer or heart disease; a history of diabetes; high cholesterol or high blood pressure; an inactive lifestyle; weight problems; or concerns about abdominal disease, pelvic disease or osteoporosis, etc.
Are there size or weight restrictions?
Mayfair's wide-bore CT scanners offer a more comfortable imaging experience, especially for larger patients or those who are prone to anxiety in tight spaces. Feet first scanning capacity, flexible design configurations, and padding provide optimal patient comfort. If you're nervous about sizing, measure your body at the widest point (usually across your abdomen or from shoulder to shoulder) and if the measurement is less than 70 centimetres, you should fit. If you are claustrophobic, you can come in for a fitting at NO charge to make sure you will be comfortable during the exam. Patients whose weight exceeds 226 kilograms (500 lbs) may be unable to have a CT scan.
What is contrast and why might it be required?
A contrast solution is administered to enhance the images of your tissues and organs. If required, it can be administered intravenously when you arrive for your scan, or you may be instructed to take it orally several hours before your scan. If your test involves a contrast solution, you may need to fast for a few hours before your exam.
Are there any risks?
The exposure to radiation from a CT scan is higher than that of standard X-rays, but the associated risk is still small. For example, the radiation exposure from one low-dose CT scan of the abdomen is similar to the exposure from the earth's natural background radiation over six months. In most cases, the benefits of a CT, such as the early detection of a serious illness, outweigh the small increased risk from radiation exposure. If your CT exam requires intravenous contrast, there is a small risk of allergic reaction to the contrast agent. Diabetes, asthma, heart disease, kidney problems, or thyroid conditions also increase your risk of a reaction to contrast.