Cardiac Imaging: Echocardiogram vs CT Angiography

Heart disease is the leading cause of death in the United States, making cardiac imaging one of the most important tools in preventive and diagnostic medicine. Two common tests — the echocardiogram and CT angiography — evaluate your heart in different but complementary ways.

Here is what each test does and when your doctor might order one at Advanced Medical Imaging.

What Is an Echocardiogram?

An echocardiogram (or "echo") uses ultrasound — high-frequency sound waves — to create real-time, moving images of your heart. It shows your heart beating, valves opening and closing, and blood flowing through the chambers.

What It Evaluates - Heart muscle function — how well your heart squeezes (ejection fraction) - Heart valves — leaking, narrowing, or other valve problems - Heart chambers — size and shape of the atria and ventricles - Pericardium — the sac surrounding the heart (looking for fluid) - Congenital defects — structural problems present from birth - Blood flow — using Doppler technology to assess flow direction and speed

The Exam Experience - Duration: 30–45 minutes - Preparation: None — you can eat, drink, and take medications normally - Radiation: None — ultrasound uses only sound waves - Discomfort: Minimal — a gel-coated probe is pressed against your chest

An echocardiogram is often the first cardiac imaging test ordered because it is safe, radiation-free, and provides a wealth of information about heart function.

What Is CT Angiography?

CT angiography (CTA) of the heart uses a CT scanner with intravenous contrast dye to create detailed 3D images of your coronary arteries — the blood vessels that supply your heart muscle with oxygen.

What It Evaluates - Coronary artery blockages — plaque buildup that narrows the arteries - Calcium scoring — measuring calcified plaque to assess future heart attack risk - Coronary anatomy — mapping the arteries before surgery or procedures - Aorta — evaluating aneurysms, dissection, or other aortic conditions - Bypass grafts and stents — checking if previous heart procedures are still open

The Exam Experience - Duration: 10–15 minutes on the scanner table - Preparation: You may be asked to avoid caffeine and take a beta-blocker to slow your heart rate for clearer images - Radiation: Low dose — modern scanners use ECG-gated techniques to minimize exposure - Contrast dye: IV contrast is injected to make the arteries visible - Discomfort: Brief warm sensation when contrast is injected

Side-by-Side Comparison

When Your Doctor Orders an Echo

Your cardiologist may order an echocardiogram for: - Shortness of breath or unexplained fatigue - Heart murmur evaluation - Monitoring known valve disease - After a heart attack to assess damage - Heart failure management - Before or after heart surgery - High blood pressure with suspected heart changes

When Your Doctor Orders CT Angiography

CT angiography is typically ordered for: - Chest pain with suspected coronary artery disease - Abnormal stress test results - Calcium score assessment in intermediate-risk patients - Pre-surgical coronary artery mapping - Evaluating bypass grafts or stents - Aortic aneurysm or dissection assessment

The American Heart Association recognizes CT angiography as a valuable noninvasive alternative to traditional catheter-based angiography for many patients.

Can You Need Both?

Yes. Because these tests evaluate different aspects of the heart, your doctor may order both: - An echo to see how well your heart muscle and valves are working - A CTA to check if your coronary arteries are blocked

Together, they provide a comprehensive picture of your cardiac health.

Cardiac Imaging in Seminole, FL

Advanced Medical Imaging offers both echocardiography and CT angiography at our ACR-accredited facility. Our board-certified radiologists specialize in cardiac imaging, and our technologists ensure a comfortable, efficient experience.

Call (727) 398-5999 or schedule online. Same-day appointments may be available.