Diagnostic imaging is a process used to view the interior parts of the body for clinical analysis. It is also used to get a visual representation of the function of some tissues and organs. Diagnostic imaging reveals the internal structures of the body which are hidden by the skin and bones so that the diseases can be diagnosed and treated. Diagnostic imaging of the chest involves the usage of plain X-rays, magnetic resonance imaging, computed tomography, nuclear scanning and ultrasonography. The non-invasive imaging of the heart by using ultrasound, computed tomography and magnetic resonance imaging is known as cardiac imaging. This book is a compilation of chapters that discuss the most vital concepts and emerging trends in the field of diagnostic imaging. Most of the topics introduced herein cover new techniques and the applications of diagnostic imaging of chest, breast, heart and vessels. Researchers and students in this field will be assisted by this book.