Essentials of Nuclear Medicine has four related objectives: 1. To provide the trainee in radiology or nuclear medicine with a practical and relevant overview of nuclear medicine, with an emphasis on diagnostic radionuclide techniques. 2. To provide the necessary non-mathematical "e;feel"e; for important principles. 3. To provide the non-medical scientist or para-medical technologist with a concise informative overview of what information may be clinically relevant, what can usefully be obtained and how to obtain it. 4. To provide a readily accessible bench book, giving at least a starting point - and frequently an answer - when unusual queries are received or less common procedures undertaken. The intention is not to supply a "e;recipe book"e; of pre-digested solutions but rather to provide a sound foundation on which the reader can build a knowledge of where and how nuclear medicine techniques may assist in patient care giving the maximum benefit for the patient at minimum cost.