Magnetic Resonance Angiography (MRA) is a developing technique that permits the non-invasive evaluation of arterial and venous structures without the need for x-ray based catheter angiography. While dramatic progress has been made in the last few years, there are still substantial limitations in the accuracy of MRA in the evaluation of coronary artery. The primary aim of this study is to evaluate state-of-the-art techniques for coronary MRA in subjects with known or suspected coronary atherosclerosis. The secondary aim of this protocol is to generate natural history data for future hypothesis-driven clinical trials using MRA techniques developed in this current protocol. The long-term objective of this pilot study and research initiative is to improve coronary MRA to the point that it can reliably replace diagnostic x-ray catheter angiography in the evaluation of subjects with atherosclerotic disease.