1. From the Center for Biomedical Imaging (E.S.H., J.H.J., A.T., L.B., M.V.S., J.A.H.), the Department of Radiology and Radiological Science (E.S.H., J.H.J., A.T., M.V.S., J.A.H.), and the Department of Neurosciences (W.F., L.B., R.A., J.A.H.), Medical University of South Carolina, Charleston, SC; and the Center for Biomedical Imaging, Department of Radiology, New York University School of Medicine, New York, NY (E.F.).