Coronary CT angiography is a non-invasive imaging technique that uses computed tomography (CT) to visualize the coronary arteries that supply blood to the heart. It is commonly used to diagnose and assess the severity of coronary artery disease, which is a condition that occurs when these arteries become narrowed or blocked due to the buildup of plaque. During a coronary CT angiography scan, a contrast dye is injected into the bloodstream to make the coronary arteries more visible on the CT images. The images produced by the scan can show any blockages or narrowing in the arteries, as well as provide detailed information about the structure and function of the heart. Coronary CT angiography is a valuable tool for identifying and evaluating coronary artery disease, as it is less invasive and more convenient than traditional methods such as cardiac catheterization. It can also help doctors determine the best course of treatment for individuals with heart disease.