Cardiac enhancement CT is performed by placing the patient in a lying position and injecting a certain amount of contrast medium from a vein, commonly used contrast medium is 60% pantethine glucosamine. After the contrast medium is injected into the blood vessels and reaches the heart, it is scanned with CT, which can clearly show the structure of the heart and blood vessels. Cardiac enhancement CT is to understand the left and right ventricles and the left and right atria of the heart, and is commonly used to understand the distribution of pulmonary veins before atrial fibrillation and pulmonary vein isolation. A fasting stomach is required before a cardiac enhancement CT, and a contrast skin test is also performed to prevent allergy to the contrast agent.