Total Non-Calcified Plaque Volume Test

Coronary computed tomography angiogram (CCTA) is a special heart scan that creates a detailed 3D picture of your coronary arteries, the vessels that supply blood to the heart muscle. Among the things it can detect is non-calcified plaque, which is made up mostly of cholesterol, fatty deposits, and inflammatory cells. Unlike calcified plaque, which contains hardened calcium and shows up easily on standard CT scans, non-calcified plaque is softer, more unstable, and harder to detect without CCTA.

This type of plaque is important because it often develops earlier in the course of atherosclerosis, the gradual narrowing and hardening of the arteries. Non-calcified plaque can rupture more easily than calcified plaque. When this happens, it can trigger the formation of a blood clot (thrombus) that can suddenly block blood flow, causing a heart attack or unstable angina. You can have significant amounts of non-calcified plaque even if your coronary artery calcium (CAC) score is zero, meaning traditional calcium scoring would miss it entirely.

With newer imaging technology, including artificial intelligence-assisted CCTA, doctors can now measure the total volume of non-calcified plaque in your arteries and track changes over time. Studies show that higher total non-calcified plaque burden strongly predicts future heart attacks and even death, sometimes more accurately than CAC scores alone. This is particularly true in people with diabetes, high blood pressure, or other cardiovascular risk factors who may not yet have symptoms.

Non-calcified plaque burden can progress if risk factors aren’t addressed, but aggressive prevention can slow or even halt it. High-intensity cholesterol-lowering therapy (such as statins or statin–ezetimibe combinations) has been shown to reduce non-calcified plaque growth and lower inflammation in the vessel wall. Lifestyle interventions, including improving diet quality, increasing physical activity, controlling blood sugar, and avoiding tobacco, remain essential for long-term artery health.