Cardiac angiography includes coronary angiography and ventriculography. Coronary angiography is a test method for coronary heart disease, and the coronary arteries are the blood vessels supplying blood to the heart and have many branches. When atherosclerosis occurs in the coronary arteries and produces plaque, the lumen is narrowed, and when the narrowing reaches 50%, coronary artery disease can be diagnosed. Coronary angiography is a minimally invasive procedure in which a catheter guide wire is inserted into the radial artery and a contrast agent is injected into the vessel to visualize the heart vessels, so that the vessel alignment and stenosis can be clearly seen. This is a minimally invasive procedure. After the procedure, the patient is given saline infusion and told to drink plenty of water, and the contrast agent will soon be excreted from the body and will have no effect on the body. Ventriculography is similar to coronary angiography in that it mainly looks at ventricular ejection, systolic and diastolic hemodynamics, and the presence of thrombus in the ventricular cavity.