1. From the Division of Cardiology (V.G., T.J.K., B.P.Y., R.J.C., I.F.P.), Cardiac MR PET CT Program (Q.A.T., D.R.O., S.A.), and Department of Cardiac Surgery (T.E.M.), Massachusetts General Hospital, Boston; and Division of Cardiology, North Shore Medical Center, Salem, Mass (D.J.R.).