What is the difference between a calcium score and a coronary CTA?

The difference between a calcium score and a coronary CTA is what each scan can see. A calcium score uses a non-contrast CT to measure only hardened, calcified plaque. A coronary CTA uses contrast and AI analysis (Cleerly) to see both calcified and soft plaque, giving a far more complete picture.

Do I need a calcium score if I am getting a CCTA?

You do not need a separate calcium score if you are getting a CCTA. The CCTA captures all the calcium-score data plus the soft-plaque analysis. Some patients start with a calcium score for triage and only get a CCTA if the calcium is elevated or family history demands a closer look.

How much radiation is in a coronary CTA?

A coronary CTA delivers about 3 to 5 mSv of radiation, comparable to one year of background radiation, depending on the scanner and protocol. Modern dose-modulation techniques have reduced this substantially. We do not order CCTAs casually, but the dose is acceptable when the question is right.

Is a stress test or a CCTA better for chest pain?

A CCTA is generally better than a stress test for new chest pain in low-to-intermediate risk patients, based on the 2021 chest pain guidelines. A CCTA visualizes anatomy directly. A stress test only suggests there might be a blockage. Stress tests still have a role in known disease and post-stent monitoring.

What is an echocardiogram and when do I need one?

An echocardiogram is an ultrasound of the heart that shows the chambers, valves, and pumping function. You need one if there is a heart murmur, unexplained shortness of breath, suspected heart failure, valve disease, or before certain medical procedures. It is fast, painless, and uses no radiation.

What is the role of cardiac MRI?

The role of cardiac MRI is tissue characterization. It can detect scarring (late gadolinium enhancement), inflammation (myocarditis), iron overload, and infiltrative diseases like amyloidosis. It is usually a second-line test ordered when an echocardiogram raises a specific question.

Will my insurance cover cardiac imaging?

Insurance usually covers cardiac imaging when there is a clear clinical indication like symptoms, abnormal labs, or strong family history. Calcium scores are often self-pay (about $100). CCTAs and stress tests usually require prior authorization, which our team handles.

How often should I repeat heart imaging?

You should repeat heart imaging every 2 to 5 years if the first scan showed disease and we are tracking response to treatment. Stable patients with clean scans can wait 5 to 10 years. The right interval depends on your specific findings and risk profile.

What is "soft plaque" and why is it so dangerous?

Soft plaque is a non-calcified, lipid-rich plaque with a thin fibrous cap. It is dangerous because it can rupture suddenly, exposing its contents to blood and triggering a clot that blocks the artery, causing a heart attack. Most heart attacks happen in soft plaques that did not narrow the artery enough to cause symptoms first.

How does Cleerly AI change interpretation of CCTA scans?

Cleerly AI changes interpretation of CCTA scans by adding quantitative, reproducible measurement to what was once a subjective read. A radiologist might say "moderate plaque." Cleerly outputs an exact volume in cubic millimeters, broken down by plaque type. That precision lets us track regression and tailor treatment.

What is the role of pericoronary fat attenuation in heart imaging?

The role of pericoronary fat attenuation is detecting inflammation around the coronary arteries. Inflamed fat appears denser on CT, and elevated values predict future cardiac events. Some advanced CCTA protocols now include pericoronary fat analysis to flag high-risk patients with otherwise modest plaque.

How does an MRI evaluate myocarditis?

An MRI evaluates myocarditis by showing patchy late gadolinium enhancement in a non-coronary distribution and elevated T2 signal indicating tissue swelling. This pattern is used to diagnose viral or post-vaccine myocarditis and to monitor recovery. It is more sensitive than echocardiography for early myocarditis.

What is the difference between a stress echo and a nuclear stress test?

The difference between a stress echo and a nuclear stress test is the imaging modality. A stress echo uses ultrasound to watch the heart contract before and after exercise. A nuclear stress test uses an IV tracer and gamma camera to image blood flow under stress. Stress echo uses no radiation. Nuclear stress test offers slightly higher sensitivity in some cases.

How does coronary calcium score regression compare to soft plaque regression?

Coronary calcium score regression is rare. Soft plaque regression is achievable with aggressive [ApoB lowering](/cardiovascular-risk/apob-heart-health), inflammation control, and lifestyle change. Calcium often increases over time even on statins, because dying soft plaque calcifies as it stabilizes. We watch soft plaque, not calcium, when assessing treatment response.

What is FFR-CT and how is it different from Cleerly?

FFR-CT (HeartFlow) calculates the functional flow reserve across coronary stenoses from a CCTA dataset, telling us if a blockage is actually limiting blood flow. Cleerly focuses on plaque burden and composition. The two are complementary: FFR-CT answers "is this blockage limiting flow?" Cleerly answers "what kind of plaque is here?"

How does cardiac amyloidosis show up on imaging?

Cardiac amyloidosis shows up on imaging as thickened heart walls on echocardiogram, a specific late gadolinium enhancement pattern on cardiac MRI, and characteristic uptake on technetium-pyrophosphate (PYP) nuclear scans. Recognition has surged because new therapies like tafamidis have made it a treatable cause of heart failure.

What is left atrial appendage closure imaging used for?

Left atrial appendage closure imaging, usually with transesophageal echo or cardiac CT, is used to plan and follow Watchman device placement in patients with atrial fibrillation who cannot take long-term anticoagulation. It maps the appendage anatomy precisely so the device fits.

How does heart imaging change in younger patients with chest pain?

Heart imaging changes in younger patients with chest pain because cardiovascular risk is lower and radiation cost is higher. We are more selective with CT, lean toward stress echo or cardiac MRI, and look harder for non-coronary causes like myocarditis, pericarditis, or musculoskeletal pain.

What is the role of carotid ultrasound in stroke prevention?

The role of carotid ultrasound in stroke prevention is screening the neck arteries for plaque and stenosis that could cause an ischemic stroke. It is often added to a cardiovascular workup in patients with high ApoB, family history of stroke, or unexplained dizziness. It uses no radiation.

Why does Fishtown Medicine often pair cardiac imaging with advanced lipid panels?

Fishtown Medicine pairs cardiac imaging with advanced lipid panels (ApoB, Lp(a), oxidized LDL, hsCRP) because the imaging shows current disease and the labs show ongoing risk drivers. Imaging without labs answers "is there plaque?" Labs without imaging answer "are you on track?" Together they answer "what should we do next?"

TL;DR · 30-second take

Heart imaging includes echocardiograms for the pump and valves, calcium scores for hardened plaque, coronary CTAs for soft and hard plaque, and cardiac MRI for tissue scarring. We use coronary CTA with Cleerly AI as the gold standard for measuring real plaque burden, since calcium scores miss the soft plaque that causes most heart attacks.

Heart and Vascular Imaging in Philadelphia: Beyond the ECG

A standard ECG only tells us about your heart's electrical rhythm. To understand your actual risk of a heart attack, we need to see the plumbing and the pump. At Fishtown Medicine, we use advanced heart imaging, including coronary CT angiography (CCTA) with Cleerly AI, to find both calcified and soft plaque before it becomes a problem. If you are over 40 with any cardiovascular risk factors, the question is no longer "should I get heart imaging," but "which scan answers my question." We help you decide.

What is the difference between the pump and the plumbing?

The difference between the pump and the plumbing is the system we are evaluating. We look at two distinct systems when we work up your heart.

The pump (structure): We use echocardiograms (ultrasound) to see how well your heart valves work and how strong the heart muscle is pumping.
The plumbing (arteries): We use CT scans (calcium scores or coronary CTAs) to see if there is any plaque buildup in the coronary arteries that could cause a heart attack.

Most patients need a look at both systems at some point, just not always at the same time.

What are the common cardiac studies compared?

Common cardiac studies compared:

Study	Primary Use	Why it Matters	Notes
Coronary Calcium Score (CAC)	Age 40-75 with intermediate risk.	Quantifies hardened plaque only; misses soft plaque.	No IV dye; low dose; often self-pay (~$100).
Echocardiogram	Murmurs, shortness of breath, valve issues.	Visualizes heart size and pumping strength.	No radiation; no prep needed.
Nuclear Stress Test	Intermediate risk with symptoms.	Shows blood flow to the heart under stress.	Uses IV tracer; moderate radiation.
Coronary CTA (Cleerly)	Atypical chest pain or higher risk.	Gold standard for visualizing soft plaque.	Uses IV dye; requires beta-blocker prep.
Cardiac MRI	Cardiomyopathy or scarring.	Best for tissue characterization.	45-plus minutes; no radiation.

Why is coronary CTA with Cleerly the gold standard?

Coronary CTA with Cleerly is the gold standard for advanced cardiovascular imaging because it sees the plaque that actually causes heart attacks. Unlike a calcium score, which only sees old, calcified plaque, a CCTA can see the young, soft plaque most likely to rupture and cause a sudden heart attack. This lets us be far more precise in our high cholesterol prevention strategy and in ApoB-targeted treatment. For patients with a family history of early heart disease or elevated Lp(a), the CCTA often changes the entire treatment plan.

Guidance from the clinic

"I start simple. For low-risk discomfort, we begin with an ECG and basic labs (ApoB, Lp(a)). But if your risk markers are elevated, we do not guess. We get a high-resolution map of your arteries. Finding plaque in your 40s is a gift. It gives us the chance to treat it before it ever becomes a crisis."

What is the clinical sequence for cardiac imaging?

The clinical sequence for cardiac imaging at Fishtown Medicine usually goes:

Risk stratification: We start with an ECG, ApoB, Lp(a), and a thorough clinical history.
Refine prevention: A coronary CTA gives us the full picture, calcified and soft plaque, to decide if you need a statin today.
Investigate symptoms: If you have exertional chest pain, we move to a stress test or coronary CTA.
Tissue check: If we suspect heart failure, infiltrative disease, or structural issues, we order an echocardiogram or cardiac MRI.

Red Flags: Seek Emergency Care

Do not wait for an elective scan. Call 911 or go to the ER if you experience:

Crushing chest pain: Pressure or tightness like an "elephant on the chest."
Pain radiating: Discomfort that moves to the jaw, neck, or left arm.
Sudden shortness of breath: Difficulty breathing even at rest.
Syncope: Fainting or losing consciousness unexpectedly.
Palpitations with lightheadedness: Irregular heartbeats with dizziness or fainting.

Key Takeaways

ECGs track rhythm; imaging tracks structure and plumbing.
Calcium scores only detect old, calcified plaque, missing the soft, vulnerable plaque that causes most heart attacks.
Coronary CTA is the gold standard for spotting dangerous soft plaque.
Chest pain should always be evaluated by a professional immediately.

Scientific References

Gulati M, et al. "2021 AHA/ACC/ASE/CHEST/SAEM/SCCT/SCMR Guideline for the Evaluation and Diagnosis of Chest Pain." Journal of the American College of Cardiology. 2021.
Williams MC, et al. "Coronary Atherosclerosis Imaging by Coronary CT Angiography." Circulation: Cardiovascular Imaging. 2020.
Greenland P, et al. "Coronary Calcium Score and Cardiovascular Risk." Journal of the American College of Cardiology. 2018.
Maron BA, et al. "Cardiac magnetic resonance imaging in cardiomyopathy." Journal of the American College of Cardiology. 2020.

Dr. Ash is a board-certified internal medicine physician at Fishtown Medicine in Philadelphia. He practices Medicine 3.0 preventive cardiology so your heart lasts as long as your ambition.

Fishtown Medicine | Diagnostics

2418 E York St, Philadelphia, PA 19125(267) 360-7927 hello@fishtownmedicine.comHSA/FSA Eligible

Schedule a Consult

Medical Disclaimer: This resource provides clinical context for educational purposes. In the world of Precision Medicine, there is no "one size fits all", the right plan must be matched to your unique lab work, physiology, and goals. Consult Dr. Ash to determine if this approach is right for you, especially if you have chronic health conditions or are taking prescription medications.

Frequently Asked Questions

Common Questions

Deep-Dive Questions

Still have a question?

He answers personally. Usually within a few hours.