CT angiography is a medical imaging technique that uses computed tomography (CT) to visualize the blood vessels in the body. It involves injecting a contrast dye into a vein, which helps highlight the blood vessels on the images. This method is often used to assess conditions like arterial blockages or aneurysms. The procedure is non-invasive and typically takes about 30 minutes. Patients may be asked to hold their breath briefly while the images are captured. CT angiography provides detailed images that help doctors diagnose and plan treatments for various vascular conditions.