This is a critical summary of PET technology and related disciplines (camera physics, radiochemistry, radiopharmacology, computerised brain atlases and databases, etc.), plus a survey of the most recent developments in the clinical and neuroscience applications of PET. The chapters systematically guide the reader from the basics of the technique - including new camera designs, new drugs, and new statistical and image processing approaches - through its most important clinical applications - in neurology, psychiatry and oncology - to the most sophisticated neuroscience applications, including research into human sensory and motor systems, the functional organization of imagery, volition, attention and consciousness in the human brain.