Coronary CT Angiogram

What is a coronary CT angiogram?

A coronary CT angiogram (CCTA) is a contrast-enhanced CT scan that images the coronary arteries — the vessels that supply your heart muscle — directly. Contrast dye injected through an IV makes the blood inside the arteries bright on the images, so a radiologist can see the open channel of each vessel, any narrowing, and the plaque in the artery wall — including the soft, non-calcified plaque that a heart calcium score cannot detect.

That last part is the reason this scan exists in screening. A calcium score counts only hardened plaque; a CCTA shows the arteries themselves. It answers a more direct question: is anything actually narrowing them?

How the scan works

Start with the problem the machine has to solve. Your coronary arteries are about the width of a drinking straw, they sit on the surface of a muscle that is squeezing roughly once a second, and they are made of soft tissue surrounded by more soft tissue. A CT scanner photographs a slice of you in a fraction of a second — but a fraction of a second is long enough for a beating heart to blur.

So the scan does two things. First, it watches your heartbeat and waits. ECG electrodes on your chest tell the scanner exactly where you are in each cardiac cycle, and it takes its pictures in the brief pause between beats, when the heart is at its stillest. That is why a slower heart helps: a slow heart has a longer pause, and a longer pause is a sharper picture.

Second, it makes the blood visible. Blood and artery wall are both soft tissue, and on their own they look nearly identical to an X-ray. Contrast dye fixes that.

Radiation on modern scanners is roughly 3–5 mSv. For scale, simply existing on Earth exposes you to about 3 mSv a year from the ground, the air, and space — so this scan is in the range of a year or so of ordinary life, and a few times more than a calcium score. That difference in dose is exactly why the calcium score is the usual first question and this scan is the follow-up.

Who should consider it?

A CCTA is most worth considering when a simpler test has left the question open — or would:

• A calcium score in the gray zone — the score confirms plaque exists, and you want to know whether any of it is narrowing an artery
• A strong family history of early heart disease with no symptoms — when reassurance should rest on seeing the arteries, not on a risk-calculator estimate
• Younger adults, in whom dangerous plaque is often still soft and non-calcified — exactly the kind a calcium score misses

If you already have diagnosed coronary disease or symptoms such as chest pain, this is no longer a screening question — see a cardiologist first.

What it can't do

A CCTA looks; it does not treat. The scan is diagnostic imaging only — if it finds a severe narrowing, the fix happens through a different, invasive procedure.

It is also a heart scan only. The rest of the body is invisible to it, which is why it pairs naturally with a full-body MRI in a comprehensive package. And like any sensitive test, it can surface borderline findings that later prove harmless.

What to expect on scan day

Below is the standard sequence for a CCTA, as of July 2026 — a short, structured visit built around one IV line and a few breath-holds. The flow on the day follows the hospital's current protocol, and your coordinator confirms the specifics (including any fasting or caffeine rules) when you book:

1. 1
   Safety screening first

   Kidney function and any contrast-allergy history are confirmed before the scan goes ahead.
2. 2
   IV line in, electrodes on

   A nurse places a small IV in your arm and ECG pads on your chest. If your heart rate runs fast, a beta-blocker may be given and allowed time to work.
3. 3
   The scan — a few breath-holds

   The contrast produces a brief warm flush, which is normal. The scanner captures the arteries between heartbeats; expect about 15–30 minutes in the room.
4. 4
   Done — drink water

   No recovery time. Drinking water through the day helps your kidneys clear the contrast.

What a coronary CT angiogram costs

A CCTA sits well above a calcium score in price: it needs contrast, a longer scanner slot, and a more involved read. In the United States, published self-pay prices as of July 2026 have commonly run into four figures, and insurance coverage generally depends on the scan being ordered for a symptom rather than for screening — asymptomatic patients usually pay cash. Quotes differ sharply between hospital radiology and freestanding centers, so verify locally rather than relying on any published range.

At New Dawn Health the CCTA is available as an add-on to a screening package; the live pricing further down this page comes straight from our booking system.

Results and follow-up

A radiologist reads the scan and issues a written report describing each coronary artery — where plaque sits, whether it is soft or calcified, and how much narrowing, if any, it causes. Turnaround and how the findings are walked through vary by hospital; your coordinator will confirm when and how your report arrives. The findings are explained along with what they change: reassurance, prevention and medication, or a referral for further cardiac testing you can take home to your own doctor.