1. From the Department of Radiology, Duke University School of Medicine, 2424 Erwin Rd, Suite 302, Durham, NC 27705 (M.B., E.A.A., A.S., M.A.M.); Department of Electrical and Computer Engineering, Duke University, Durham, NC (M.A.M.); and Department of Biostatistics and Bioinformatics, Duke University, Durham, NC (M.A.M.).