Magnetic Resonance Imaging (MRI) is one of the most exciting developments in medicine. It produces detailed images of the human body without using radiation and with little discomfort to the patient. Due to its inherent safety and long-term cost-effectiveness, MRI is likely to dominate diagnosis in the future. The use of MRI is already widespread in the USA and is increasing throughout Europe, Japan and Australia. Current literature in this area has been predominately written by radiologists and physicists, providing technical and complicated explanations of the theory and concentrating in the latter part on illustrating various images and their value in diagnosis. The authors of this handbook have produced a comprehensible introduction to MRI, concentrating on the principles and practice for those who need to understand the essential concepts.