1. Laboratory of Biorheology and Medical Ultrasonics, University of Montreal Hospital Research Center (CRCHUM), 900 Saint-Denis, Rm R11-464, Montreal, QC H2X 0A9, Canada.
2. Department of Radiology, Radio-Oncology and Nuclear Medicine, and Institute of Biomedical Engineering, University of Montreal, Montreal, QC, Canada.
3. Department of Radiology, University of Montreal Hospital (CHUM), Montreal, QC, Canada.
4. Department of Neurosciences, University of Montreal, Montreal, QC, Canada.
5. Department of Neurology, CHUM, Montreal, QC, Canada.
6. Laboratory of Clinical Image Processing, CRCHUM, Montreal, QC, Canada.