This book, in MCQ format, is a comprehensive tool that will help Nuclear Medicine and Radiology residents and attending physicians to understand concepts in nuclear medicine. Questions cover clinical applications of nuclear medicine techniques to the cardiovascular, pulmonary, endocrine, skeletal, gastrointestinal, genitourinary, and central nervous systems. In addition, topics in physics, radiopharmacy, and radiation safety are addressed. The MCQ format closely resembles that used in board examinations in nuclear medicine. Each question has four possible answers, only one of which is correct. About 60% of the questions are linked to clinical cases, with each case having four questions on average, along with one or two images. The remainder of the questions are free-standing, with or without an image. Answers are concise but are supported by references to the literature when necessary. Pearls in boxes are used to highlight the most important pieces of information. While the questions are scrambled, as in board exams, an index categorizes each question into one of the systems or topics.