1. From Stroke Service, Department of Neurology, and AA Martinos Center for Biomedical Imaging (H.A), Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, Mass; AA Martinos Center for Biomedical Imaging (T.B., E.M.A., A.G.S.), Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, Mass; Stroke Service (K.L.F., A.B.S., E.E.S.), Department of Neurology, Massachusetts General Hospital, Harvard Medical School, Boston, Mass; Stroke Center...