1. Department of Technical Physics, University of Eastern Finland, Kuopio, Finland
2. Centro de Investigación Biomédica en Red en Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Instituto de Salud Carlos III, Spain
3. Department of Technical Physics, University of Eastern Finland, Finland
4. Diagnostic Imaging Center, Kuopio University Hospital, Finland
5. Science Service Center, Kuopio University Hospital, Finland