In this book, the authors discuss the procedures, techniques and applications of medical imaging; which creates images of the human body for clinical purposes or medical science. Topics discussed in this compilation include the use of whole-body fluorine-18-fluorodeoxyglucose positron emission tomography in patients with large-vessel vasculitis and sarcoidosis; medical image registration; radiological techniques in medical imaging; electrical impedance tomography (EIT); imaging of brain function with PET and its role in aphasia research; and real-time functional magnetic resonance imaging.