1. Thoraxcenter, Biomedical Engineering, Erasmus Medical Center, Rotterdam 3000 CA, The Netherlands
2. Faculty of Electrical Engineering, Mathematics and Computer Science–Micro Electronics, Delft University of Technology, 2628 CD Delft, The Netherlands
3. Department of Experimental Medical Instruments, Erasmus Medical Center, 3015 CN Rotterdam, The Netherlands
4. Faculty of Applied Science-Imaging Physics, Delft University of Technology, 2600 AA Delft, The Netherlands