1. From the Canon Stroke and Vascular Research Center 875 Ellicott Street Buffalo NY 14222USA
2. Department of Radiology University of Cincinnati 234 Goodman Street Cincinnati OH USA
3. San Francisco Department of Radiology and Biomedical Imaging University of California 505 Parnassus Avenue San Francisco CA 94143USA
4. Department of Cardiovascular Medicine Juntendo University 3‐1‐3 Hongo, Bunkyo‐ku Tokyo Japan
5. Department of Radiology Juntendo University 3‐1‐3 Hongo, Bunkyo‐ku Tokyo Japan
6. Canon Medical Systems USA, Inc. 2441 Michelle Drive Tustin CA 92780USA