Vasken Dilsizian, MD, MASNC, FACC, FAHA, Professor of Medicine and Radiology, University of Maryland School of Medicine, and Chief, Division of Nuclear Medicine, University of Maryland Medical Center, Baltimore, MD, USA Gerald M. Pohost, MD, FACC, FAHA, Professor of Medicine, Department of Medicine, Loma Linda University, Loma Linda, CA, and Director of Cardiovascular Imaging, Westside Medical Imaging, Beverly Hills, CA, USA