1. Biomedical Engineering Department, Case Western Reserve University (CWRU), Cleveland, OH, USA
2. Radiology Department, CWRU, Cleveland, OH, USA
3. Mechanical and Aerospace Engineering Department, CWRU, Cleveland, OH, USA
4. Department of Physics, Toronto Metropolitan University, Toronto, ON, Canada
5. Department of Biomedical Engineering and the Department of Radiology, CWRU, Cleveland, OH, USA