Coronary Artery Plaque: How Cardiac CT Can Help Detect It
If you’re experiencing symptoms of coronary artery disease or want to understand how your risk factors may affect your heart health, a cardiac CT scan is a valuable diagnostic tool. Also known as CT coronary angiography (CTCA), Coronary CT enables cardiologists to detect plaque buildup in the coronary arteries—vessels responsible for supplying oxygen-rich blood to your heart. Plaque accumulation can lead to artery narrowing or blockage, causing chest pain and increasing the risk of heart disease or heart attacks.
Overview of the Heart
Your heart is a vital muscular organ that pumps blood throughout your body. Blood transports oxygen and nutrients to tissues and removes waste products. The heart has four chambers: the right atrium and ventricle, and the left atrium and ventricle. The right side pumps oxygen-poor blood to the lungs for oxygenation, while the left side pumps oxygen-rich blood to the rest of your body.
Valves, made of tissue flaps called leaflets, separate each chamber and ensure blood flows in the correct direction. Proper valve function is essential for efficient blood circulation; when valves don’t open or close properly, it’s known as valve disease.
What Is a CT Scan?
A computed tomography (CT) scan is an advanced imaging technique that uses specialized X-ray equipment to create detailed cross-sectional images of the body’s internal structures. CT scans are used to evaluate various parts of the body including the brain, spine, chest, abdomen, pelvis, and blood vessels. A cardiac CT scan specifically assesses the coronary arteries for plaque buildup. Coronary artery disease plaque consists of fatty deposits accumulating inside artery walls over time. This atherosclerosis can range from mild narrowing to complete artery blockage, which if untreated, may lead to myocardial infarction (heart attack).
Magnetic Resonance Imaging vs. X-Ray
Cardiologists commonly use two types of imaging to detect coronary artery disease plaque: MRI and X-ray. Magnetic Resonance Imaging (MRI) and X-ray MRI offers the highest sensitivity for identifying plaque but is often costly and less accessible. Conversely, X-rays are more affordable and widely available but less sensitive, particularly in detecting calcium deposits that can harden into plaques. When physicians suspect advanced or calcified plaque, MRI or cardiac CT may be preferred for more comprehensive evaluation.
An Example of a Normal Heart Using Cardiac CTA
A normal cardiac CT angiography (CTA) image shows clear coronary arteries free from plaque buildup, indicating no constriction or blockage. This allows blood to flow easily, reducing the risk of heart attack or other cardiovascular complications. In contrast, the presence of plaque narrows the arteries and limits blood flow, leading to symptoms such as chest pain and shortness of breath, and increasing the risk of heart attack or stroke. Cardiac CT scans are vital for early detection, enabling timely management to prevent serious heart events.
Advancements in cardiac CT technology have significantly improved the early detection and management of coronary artery disease. Modern scanners deliver high-resolution images with lower radiation doses, enhancing patient safety without compromising diagnostic accuracy. Additionally, cardiac CT scans can provide detailed visualization of both calcified and non-calcified plaques, informing personalized treatment strategies. Incorporating cardiac CT into routine cardiovascular risk assessment can help identify asymptomatic patients at risk, facilitating preventive interventions such as lifestyle modification and medication, ultimately reducing the incidence of heart attacks and improving long-term outcomes.
