1. From the Departments of Cardiology (J.W., H.L., H.X., L.X., C.L.), Neurology (S.Y.), and Radiology (X.H., Z.G., L.W.), People’s Liberation Army General Hospital, Beijing, China; Department of Radiology, University of Washington, Seattle (J.S., C.Y.); and Center for Biomedical Imaging Research, Department of Biomedical Engineering, Tsinghua University School of Medicine, Beijing, China (C.Y., X.Z., H.C.).