1. Department of Telecommunications and Information Processing (TELIN)-IPI Research Group, Faculty of Engineering and Architecture, Ghent University-Imec, Sint-Pietersnieuwstraat 41, B-9000 Ghent, Belgium
2. Department of Physics and Astronomy, Radiation Physics, Ghent University, Proeftuinstraat 86/N12, B-9000 Ghent, Belgium
3. Centre for X-ray Tomography (UGCT), Ghent University, Proeftuinstraat 86, B-9000 Ghent, Belgium
4. Department of Environment, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium