1. CT Systems and Applications Laboratory, GE Global Research Center, 1 Research Circle, Niskayuna NY, USA
2. Biomedical Imaging Division, VT-WFU School of Biomedical Engineering and Sciences, Virginia Tech., Blacksburg, VA, USA
3. Department of Radiology, Division of Radiologic Sciences, Wake Forest University Health Sciences, Winston-Salem, NC, USA
4. Biomedical Imaging Division, VT-WFU School of Biomedical Engineering and Sciences, Wake Forest University Health Sciences, Winston-Salem, NC, USA
5. Department of Biomedical Engineering, Rensselaer Polytechnic Institute, Troy, NY, USA