Radiology is a medical specialty that involves the use of radiation for diagnosing and treating diseases. Clinical radiology systems make use of both ionizing radiation such as X-rays and non-ionizing radiation such as ultrasound. Radiology helps in capturing pictures or images of the structures in the body. Diagnostic radiology and interventional radiology are the broad two areas within radiology. Diagnostic imaging is used for diagnosing, monitoring, and screening conditions such as broken bones, heart conditions, and blood clots. The objective of interventional radiology techniques such as MRI and CT Scans is to guide medical procedures in the process of inserting catheters, wires and other small instruments and tools within the body. Some important techniques of radiology are positron emission tomography (PET) scan, nuclear medicine tests such as thallium cardiac stress test, thyroid scan and bone scan, magnetic resonance angiography (MRA), and computed tomography (CT) scan. This book provides significant information with respect to radiology for developing a good understanding of the subject. It presents researches and studies performed by experts across the globe. This book will serve as a reference to a broad spectrum of readers.