The use of non-ionizing energy with the consequent absence of an environmental impact and of operator and patient biohazards makes MRI a winning technique when evaluating the risk – benefit ratio in comparison to other imaging methods. In virtue of its added diagnostic value and inherent refinements that allow construction of two- and three-dimensional images, MRI is gaining a primary role in the histopathological and physiopathological understanding of a large number of pathologies concerning the heart and vessels. This text is addressed both to MRI operators seeking specific technical information and to clinicians who wish to have a better understanding of the diagnostic and management advantages that MRI can offer.