1. German Cancer Research Center (DKFZ), Department of Radiology (E010), Im Neuenheimer Feld 280, 69120 Heidelberg, Germany
2. Heidelberg University Hospital, Department of Neuroradiology, Im Neuenheimer Feld 400, 69120 Heidelberg, Germany
3. University of Würzburg, Department of Experimental Physics 5, Am Hubland, 97074 Würzburg, Germany
4. Würzburg University Hospital, Department of Diagnostic and Interventional Neuroradiology, Josef-Schneider-Straße 11, 97080 Würzburg, Germany