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For those at risk of coronary artery disease (CAD), screening exams are very important. CAD occurs when plaque (composed of fat, cholesterol, or calcium) builds up inside the arteries around the heart – too much plaque narrows the arteries and reduces blood flow. Screening tests help determine the amount of plaque, its nature (hard or soft), and what treatment options are applicable.
To help diagnose CAD, patients are usually referred for one of two main screening exams: a coronary angiography or a coronary computed tomography angiography (CCTA). Often, there is debate over which test is more accurate and safer.
Coronary angiography is the most common method for detecting coronary artery stenosis or narrowing of an artery that may require a stent or bypass surgery. In these cases, it can be used for both diagnosis and treatment in a single session, since the images are finely detailed and precise. This procedure is most often recommended for patients with a high risk of coronary artery disease and typical symptoms.
CCTA is quick, precise, and relatively painless with results that are detailed enough for doctors to make decisions that are 95-99% accurate in patients without severe disease. It’s able to reliably rule out coronary artery disease in patients with atypical symptoms and low-to-medium risk of disease, reducing the need for invasive angiography and rendering it a safe and effective tool when it is needed. It also requires very little preparation and no recovery time.
A coronary angiography is an invasive procedure, which in rare cases can lead to serious problems like heart attack or stroke. There is also a risk of a tear or sudden closure in an artery, allergic reaction to the dye, and bleeding or bruising where the catheter was inserted. It also requires fasting before the procedure and hours of hospitalized recuperation afterward. Plus, there is potential for overuse when diagnosing patients with atypical symptoms and low-to-medium risk of disease.
CCTA also has the possibility of an allergic reaction to the contrast dye. As well, certain patients may not be good candidates for this exam, such as:
There is ongoing debate over when to use CCTA versus coronary angiography and for which types of patients. Some recent studies have shown that the diagnostic abilities of the two exams are equivalent, but due to lower costs and improved safety CCTA is thought to be a better gatekeeper and first-line test to triage patients and determine the need for medical therapy or invasive evaluation. Plus, the current CT scanners have lower doses of radiation and improved accuracy as compared to older machinery, and patients often prefer CCTA for coronary disease testing since it’s less invasive.
Coronary CT angiography is available as a private pay exam, not covered by Alberta Health Care, at our Mayfair Place location. It can be purchased on its own or as part of a Health Assessment package, which provides a discount on multiple imaging exams when purchased together.
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.
Whether public or private, medical imaging must be requested by a health care practitioner who will provide a requisition. Your medical and family history, risk factors, and type and duration of symptoms, all affect a referring physician’s decision on which type of imaging is appropriate.
When we receive your requisition Mayfair Diagnostics will schedule your exam and provide you with detailed information to prepare for it. Once your exam is completed, your images will be reviewed by a specialized radiologist who will compile a report that is sent to your doctor.
For more information about CCTA, visit the exam page for preparation and procedure information.
Knaapen, P. (2019) “Computed Tomography to Replace Invasive Coronary Angiography?” www.ahajournals.org. Accessed August 15, 2022.
Mayo Clinic Staff (2021) “Coronary angiogram.” www.mayoclinic.org. Accessed August 15, 2022.
Parikh, R., et al. (2020) “Cardiac Computed Tomography for Comprehensive Coronary Assessment: Beyond Diagnosis of Anatomic Stenosis.” Methodist Debakey Cardiovasc Journal. Apr-Jun; 16(2): 77–85.
Healthwise Staff (2021) “Computed Tomography Angiogram (CT Angiogram).” www.myhealth.alberta.ca. Accessed August 15, 2022.
Radiological Society of North America (2022) “Coronary CTA.” www.radiologyinfo.org. Accessed August 15, 2022.
Stefanini, G. G. and Windecker, S. (2015) “Can Coronary Computed Tomography Angiography Replace Invasive Angiography?” American Heart Association Journals. January 26, 131: 418-426
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At the heart of everything we do is a belief that every image tells a story—and every story deserves care.
At Mayfair Diagnostics, we provide state-of-the-art medical imaging that helps patients and physicians get the clarity they need to make informed decisions about health. From routine check-ups to complex diagnoses, our role is to deliver answers with compassion and accuracy.
We offer a full spectrum of imaging services, including:
MRI, CT, and X-Ray for advanced diagnostic insight
Ultrasound and Mammography for preventative and women’s health
Nuclear Medicine, Bone Density, and Cardiac Imaging for specialized care
Pain Management and Interventional Procedures to improve quality of life
But our work extends beyond exams and equipment. As the largest teleradiology provider in Western Canada, we connect urban, rural, and remote communities with expert radiology services—ensuring access to care when and where it’s needed most.
We also partner with local organizations, sports teams, and community groups to keep people healthy and active. From professional athletes to families booking their first screening, our commitment is the same: timely results, advanced technology, and compassionate care.
To improve lives with clarity, compassion, and care—one focused image at a time.
But numbers only tell part of the story. What truly defines us is our culture of compassion. We’re a team of caregivers, innovators, and problem-solvers who share a commitment to excellence. Whether supporting frontline care, developing new technology workflows, or guiding a patient through their appointment, we approach our work with empathy and integrity.
At Mayfair, you’re not just part of a company—you’re part of a community. Together, we’re shaping the future of health care, making advanced imaging accessible, and creating a workplace where people feel valued, supported, and inspired to grow.
WHO WE ARE. WHAT WE DO. Why we’re more than a workplace
At Mayfair Diagnostics, we’re caregivers, nurturers, creators and thought leaders—deeply rooted in a passion to help people. We deliver meaningful work, compassionate care, and an environment where every team member can thrive.
Key Points:
Founded on over a century of excellence in medical imaging.
Owned and operated by 50+ radiologists, supported by 400–640+ employees across clinical, technical, administrative, and support roles.
Operating 17 locations across Alberta, Saskatchewan, and beyond (14 in Calgary, plus Cochrane, Regina, Saskatoon).
Serving 600,000–700,000 patients annually, delivering over 90,000 radiological interpretations—the largest teleradiology provider in Western Canada.
Vision & Mission:
Vision: “A world in which every person has clarity about their health.”
Mission: “To improve people’s lives, one focused image and one caring, compassionate human touch at a time.”
