1. From the School of Computing and Information, University of Pittsburgh, Pittsburgh, Pa (K.Y., Z.L.); Department of Electrical and Computer Engineering, Boston University, 8 St. Mary’s St, Office 421, Boston, MA 02215 (S.G., K.B.); Department of Radiology, University of Pittsburgh, Pittsburgh, Pa (C.D.); and Chobanian & Avedisian School of Medicine, Boston University, Boston, Mass (C.B.P.).