1. ELETTRA-Sincrotrone Trieste S.C.p.A.; Trieste; Basovizza; Italy
2. Institute of Physics of Biological Systems-Biomedical Imaging Center (CIBM); Ecole Polytechnique Fédérale de Lausanne (EPFL); Lausanne; Switzerland
3. Division of Medical Radiation Physics; Bern University Hospital; Bern; Switzerland