The techniques and processes used to create the images of the interior of the human body are called medical imaging. It aims to reveal the internal structures of the body, which are hidden by the bones and skin, and to diagnose and treat diseases and disorders. It is also used to identify the possible abnormalities in the anatomy and physiology of the body. Positron emission tomography (PET) is a common type of medical imaging technique. It involves the use of radioactive tracer to observe the metabolic processes of the body as an aid to diagnose a disease. It is most commonly used for the imaging of tumors and cancers. This book unfolds the innovative aspects of medical imaging which will be crucial for the progress of the subject in the future. The various types of medical imaging techniques along with technological progress that have future implications are glanced at in it. The extensive content of this book provides the readers with a thorough understanding of the subject.