Philipp Dammann1, Oliver Kraff, Stefan Maderwald, Elke Gizewski2, Mark Ladd, Thomas Gasser3
1Neurosurgery, University of Duisburg-Essen, Germany and Erwin L. Hahn Institute for Magnetic Resonance Imaging, Essen, NRW, Germany; 2Department for Diagn. and Interv. Radiology and Neuroradiology, University of Duisburg-Essen, Germany; 3Department of Neurosurgery, University of Duisburg-Essen, Germany
In this study we assess geometrical distortion over a head-sized phantom at ultra-high-field MRI (7 Tesla). As field inhomogenity is proportional to B0, system-related distortions of spatial encoding are expected to increase with the field strength. This may interfere with potential image-guided applications in ultra-high-field MRI. This study revealed that distortion is lower than expected, showing no significant difference in distortion at 7 Tesla compared to lower field strength within a range of 91 mm from the magnetic center. Image distortion correction reduced local distortion maxima but didn`t significantly reduce mean distortion over the whole volume.