In this multicenter trial, the safety and efficacy of magnetic resonance imaging (MRI) for visualization of the coronary arteries (CMRA, coronary magnetic resonance angiography) with MS-325. MS-325 is a new blood pool radiological contrast agent which will be assessed as part of a phase II feasibility study. The Laboratory of Cardiac Energetics in collaboration with the Department of Cardiology at the George Washington Hospital Center will be one of the six participating sites for this study.