Cardiovascular angiography is a technique to visualize the cardiovascular system by injecting a contrast medium. This radiographic technique is performed in the cardiac catheter to identify any cardiac chambers, large vessels or coronary vessels. This technique is performed in a cardiac catheter to identify any cardiac chambers, large vessels or coronary vessels. A contrast agent containing an organic compound that is transparent under X-ray irradiation is rapidly injected into the blood stream to visualize the heart and large vessel cavities under X-ray irradiation, and the process of visualizing the heart and large vessel cavities is filmed by rapid film, videotape or tape recording. Physiological and anatomical changes in the heart and great vessels. It is a valuable method for diagnosing cardiovascular disease. It is performed by injecting the contrast agent directly and rapidly into the selected cardiac chambers or large vessels with the help of a cardiac catheter, so that the highest concentration can be achieved quickly and a good visualization can be obtained, and the lesions in the area can be shown more clearly. It has become one of the commonly used diagnostic methods for cardiovascular diseases, especially essential for pre-surgical diagnosis of complex cardiovascular malformations or coronary bypass grafting.