This one-week module is part of the ERASMUS Course on Magnetic Resonance Imaging. It is meant to provide a solid understanding of the basic principles underpinning MRI. Topics related to nuclear magnetic resonance, image encoding, relaxation, spin-echo and gradient-echo imaging, fast imaging, instrumentation, site planning, specialized MRI. Formal lectures are intertwined with question&answer and self-teaching sessions. The course is targeted at diagnostic imaging professionals including fields of Clinical Radiology, Medical Physics, Radiography, Electroradiology and staff/students from clinical and scientific facilities. No previous knowledge of MR principles is assumed.