MRI stands for magnetic resonance imaging and it is used to take pictures of the internal organs and soft tissues of the body without using X-rays. It uses magnets and radio waves to produce detailed pictures of the body's soft tissues and internal organs. During the process of magnetic resonance imaging, a dye known as contrast medium is injected into the person's blood via a vein in the forearm or hand. A type of MRI, known as magnetic resonance angiography (MRA) is used to provide a detailed view of blood vessels that supply blood to the kidneys. Another type of MRI known as magnetic resonance urography (MRU) is used to evaluate patients with hematuria. The ever growing need of advanced technology is the reason that has fueled the research in the field of MRI in recent times. This book traces the progress of this field and highlights some of its key concepts and applications. It will help the readers in keeping pace with the clinical advances in this field.