1. Department of Physics and Astronomy; Heidelberg University; Heidelberg Germany
2. Department of Radiology; A. A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital; Charlestown Massachusetts USA
3. Siemens Healthcare; Erlangen Germany
4. Department of Electrical Engineering and Computer Science; Massachusetts Institute of Technology; Cambridge Massachusetts USA
5. Harvard Medical School; Boston Massachusetts USA
6. Harvard-MIT Division of Health Sciences and Technology; Massachusetts Institute of Technology; Cambridge Massachusetts USA
7. Division of Neuroradiology, Department of Radiology; Massachusetts General Hospital; Boston Massachusetts USA
8. Medical Physics in Radiology; German Cancer Research Center (DKFZ); Heidelberg Germany