Once a patient has completed an initial assessment and scan, we will ask the patient to return for follow up visits at 3 months and 1 year for repeat MCG. A 2D ECHO will be obtained at 3 months if clinically indicated, and at 1 year. In addition, we are asking for follow up scans if the patient presents with any cardiac symptoms such as chest pain, shortness of breath, or fainting Follow up phone interview will occur at 6 months. We will ask information regarding symptoms, treatments, hospital admissions, cardiologist visits, and any subsequent diagnostic testing performed including ECGs, transthoracic echos, transesophageal echos, exercise/chemical stress testing, angiograms, and cardiac catheterizations.