Gopal B. Saha, PhD Emeritus Staff Department of Nuclear Medicine The Cleveland Clinic Cleveland, OH 44195, USA Dr. Saha is the author of three critically acclaimed books in nuclear medicine: Basics of PET Imaging; Fundamentals of Nuclear Pharmacy, 6/e (978-1-4419-5859-4); and Physics and Radiobiology of Nuclear Medicine, 4/e (978-1-4614-4011-6).