Cardiac nuclear scan, also known as cardiac radionuclide imaging, is a method of evaluating myocardial blood flow, metabolism, activity, and ventricular function by applying radionuclides or radionuclide-labeled drugs for cardiac imaging. These are generally techniques of cardiac radionuclide examination in which radionuclides or radionuclide-labeled drugs are injected intravenously and myocardial imaging is performed using selective uptake of these nuclides or their markers by cardiomyocytes to determine myocardial ischemia or necrosis; or ventricular size and function are measured using substances such as nuclide-labeled proteins or red blood cells that do not pass through the walls of blood vessels in the short term. The current range of examinations includes nuclide myocardial perfusion imaging, nuclide myocardial metabolic imaging, nuclide ventricular (cardiac function) imaging, and nuclide cardiac receptor imaging. It is valuable for the in-depth study of the etiology, prognosis and treatment of coronary heart disease.