This book aims to summarize the research progress of integrated PET MR brain function and molecular imaging, and more importantly, clinical application and research status of PET MR of brain imaging from brain diseases to brain science. Starting from the overviews of brain function imaging technology, following chapters introduces clinical application of integrated PET MR specific brain diseases in details, such as Alzheimer's disease, Parkinson's disease, epilepsy, and brain tumor, etc., which are hot issues of brain science research. It will be a useful reference to residents and practitioners in nuclear medicine, radiology, and neurology, as well as those interested in molecular imaging of brain.