1. From the Department of Radiology and Molecular Imaging Program at Stanford (Z.L., F.C., X.X., M.P., S.S.G., Jo.C.W.), the Department of Medicine, Division of Cardiology (Je.C.W., J.P.C., Jo.C.W.), the Department of Cardiothoracic Surgery (A.Y.S., R.C.R.), and the Department of Medicine, Division of Hematology (D.K.), Stanford University School of Medicine, Stanford, Calif.