1. From the Departments of Radiology (K.N., J.R.E., M.S., A.S., F.F.), Surgery (A.C.B.), Medical Oncology (T.A.), and Pathology (J.P.P.), Thomas Jefferson University, 763H Main Building, 132 S 10th St, Philadelphia, PA 19107; and Department of Electrical and Computer Engineering, Drexel University, Philadelphia, Pa (A.S.).