Noninvasive cardiac imaging is an integral part of the practice of current clinical cardiology. During the past three decades a number of distinctly different noninvasive imaging techniques of the heart, such as radionuclide imaging, echocardiography, magnetic resonance imaging, and X-ray computed tomography have been developed. Remarkable progress has been made by each of these technologies in terms of technical advances, clinical procedures, and clinical applications/indications.