1. From the Noninvasive Cardiovascular Imaging Program, Departments of Medicine (A.H.W., G.C.S., N.G., R.B.) and Radiology (A.H.W., R.D., N.G., F.J.R., R.B., M.S.), Applied Imaging Science Lab (R.D., N.G., F.J.R., M.S.), and Division of Cardiac Surgery, Department of Surgery (I.G., G.S.C.), Brigham and Women’s Hospital, Boston, MA.