Richard Ansorge is a retired senior lecturer at the Cavendish Laboratory Cambridge and a former fellow and tutor of Fitzwilliam College Cambridge. He has extensive experience of experimental high energy physics, including significant contributions to the CERN UA5 experiment on the proton-antiproton collider in the 1980s. More recently he has collaborated with research groups on the Cambridge Biomedical campus in several areas including improving 3D medical imaging methods including MRI and PET. He is author of more than 100 scientific publications in these fields. He is particularly interested in applying computers for processing data from complex instrumentation. This has applications which are equally relevant in both high energy physics and medical imaging. He wrote his first computer program in 1964 for EDSAC2 and has been coding ever since. Much more recently he has developed code for 3D medical image registration using GPUs which are probably 1010 times more powerful than EDSAC. He has extensive undergraduate teaching experience and has taught both physics and mathematics in the first year of the Cambridge Natural Sciences Tripos and also more specialised courses in later years. He has also given several popular outreach lectures on Medical Imaging. He is a Fellow of the Institute of Physics and a member of the IEEE. Martin Graves is a Consultant Clinical Scientist and lead of the Cambridge University Hospitals MR Physics group. He also holds an Affiliated Lecturer position with the University of Cambridge Clinical School. He is a Fellow of the Institute of Physics and Engineering in Medicine (IPEM), a Fellow of the Higher Education Academy (HEA), member of the Institute of Engineering and Technology (IET) and is an Honorary Member of the Royal College of Radiologists (RCR). He has served on various national and international committees including the British Institute of Radiology (BIR), the International Society of Magnetic Resonance in Medicine (ISMRM) and the European Society of Magnetic Resonance in Medicine and Biology (ESMRMB). He is a member of the editorial board of European Radiology. He has over 30 years' experience in both clinical and research aspects of MRI and has published over 170 articles and has been a co-investigator on over GBP3.2M of external grant funding. In addition to this book he is co-author of the award winning MRI textbook MRI: From Picture to Proton (Cambridge University Press, 2003 and 2007) of which the 3rd edition will be published this year. He is a co-author of Physics MCQs for the Part 1 FRCR (Cambridge University Press, 2011) and co-editor of Carotid Disease: The Role of Imaging in Diagnosis and Management (Cambridge University Press, 2007). He is a respected MR educator and regularly contributes to MRI teaching for physicists, radiographers and radiologists locally, nationally and internationally.