While taking courses in Magnetic Resonance Imaging, Diagnostic X-ray, and Computed Tomography, we found it very difficult to comprehend some of the major concepts of these courses. Due to this situation, we decided to write manuals on MRI, Diagnostic X-ray and CT. Within these books, we have taken the complex concepts of MRI, Diagnostic X-ray, and CT and rewritten them in a shorter, simplified version so that the lay person can comprehend them. Hopefully with these books, learning these subjects will be easier, less stressful, and more enjoyable.