1. From the Departments of Radiology (Y.W., C.Z., E.L., H.P.C., A.C., L.M.H., E.A.K.) and Internal Medicine (E.A.K.), The University of Michigan Medical School, 1500 E Medical Center Dr, Medical Inn Building, Rm C479, Ann Arbor, MI 48109-0904; Department of Electrical Engineering and Computer Science, The University of Michigan, Ann Arbor, Mich (Y.W., L.Y.); and Department of Diagnostic Radiology, Cleveland Clinic, Cleveland, Ohio (A.C.).