Coronary CT angiography, also called coronary CTA or CCTA, uses computed tomography (CT) images and iodine-containing contrast injected through an intravenous (IV) line in a vein to examine plaque and narrowing in the arteries that supply the heart. It may help evaluate stable symptoms or clarify an uncertain test result.
How is coronary CTA different?
- Coronary CTA: Shows artery anatomy, including calcified and noncalcified plaque, using IV contrast.
- Coronary calcium scoring: A noncontrast CT that measures calcified plaque to inform a prevention discussion. It does not provide the same artery detail as CTA.
- Stress testing: Evaluates the heart’s response to exercise or medication. Imaging tests such as PET/CT stress testing assess blood flow to heart muscle.
What happens during the visit?
You lie on a CT table with electrocardiogram (ECG) monitoring to record your heartbeat and an IV for contrast. The team may ask you to hold your breath briefly during imaging. The scan itself is short, but preparation and observation add time. Confirm the full appointment length with the center.
Depending on your heart rate and medical history, the team may give medicines to slow the heartbeat or widen the coronary arteries for clearer pictures. Follow only their specific medication instructions.
What should I tell the testing team?
- Any previous reaction to CT contrast, kidney disease, recent illness, or possible pregnancy.
- Your complete medication list, including erectile-dysfunction or pulmonary-hypertension medicines, so the team can check for interactions with medicines used during scanning.
- Any concerns about lying flat, holding your breath, or enclosed spaces.
Ask whether kidney-function blood testing is needed and obtain written food, drink, caffeine, and medication instructions. Do not stop or add medicines on your own. If you have diabetes or are breastfeeding, ask for guidance specific to your situation.
The main considerations include radiation exposure, contrast reactions, and kidney risk in susceptible patients. Discuss these with the ordering clinician when choosing the test.
What does the result mean?
The report describes plaque and estimated narrowing. Heavy calcium, motion, or irregular rhythms can limit image clarity. A finding may lead to prevention treatment, further assessment, or a discussion about invasive angiography; it does not automatically mean a stent is needed. CTA diagnoses disease but cannot treat a narrowing during the scan.
Ask who will review the report with you and what follow-up is needed. Bring our questions before a planned test worksheet.
Call 911 for new severe or persistent chest pressure or other possible heart-attack symptoms. Do not wait for an outpatient scan.
Sources and further reading
This guide provides general education. Your testing center’s individualized instructions take precedence. Back to Test Instructions.
About this patient guide
This guide provides general education to help you prepare for a conversation with your care team. The sources and further reading link to additional information from medical organizations.
A medical-review date refers to review of the clinical information. Wording, formatting, and link updates do not by themselves change that date. Your own care depends on your symptoms, medical history, and discussion with your clinician.
Found something unclear? Contact our office. Please do not include private medical details in the general appointment form.
