If a participant is a Gill Heart Institute referral patient , they will receive an intravenous (through a vein in the arm) infusion of gadolinium as part of their clinical examination. Participants will also have electrocardiogram (ECG) waveform performed in order to gate the MRI scan. The MRI scan of the heart, for which the participant has been referred will last approximately 1 hour. Participants will have an additional 5-10 minutes of scans performed, none of which require additional infusions.