This book discusses new methods for dynamically assessing the brain function of patients with neurological diseases, describing such advanced techniques as positron emission tomography, nuclear magnetic resonance spectroscopy, and the autoradiographic analysis of transport, metabolism andreceptor binding. The book adopts the clinician's point of view, and provides the background needed to understand the rapid advances in our understanding of brain metabolism. It aims to explain how these new techniques are used in assessing neurological disorders of metabolism.