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Each year over 1.5 million people in the United States have a heart attack; about 1/3 of those people die. The mortality rate and cost can be reduced through preventative measures (diet, exercise, quitting smoking), and also with the development of techniques for more efficient screening and management of cardiac patients. Diagnostic imaging plays a very important role in the initial screening and subsequent management of coronary disease patients. To assess the severity and treatability of the patient's condition, the cardiologist may perform a series of diagnostic tests of increasing specificity, invasiveness and cost, as necessary. Recent research and development in cardiac magnetic resonance imaging (MRI) has shown that it may be possible to replace the sequence of tests with a single exam, performed entirely in an MR scanner. Though an MR scanner is expensive, the ability to consolidate the diagnostic tests into a single session would result in a significant cost reduction and a more convenient procedure for the patient. MRI may also provide the physician with diagnostic information not available from the standard battery of tests. In this article, we concentrate on one aspect of a cardiac MRI exam that provides previously unavailable information: assessment of myocardial contraction.