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Abstract #3023

Radio Frequency (B1) Field Mapping at 7T Using 3D SE/STE EPI Technique

Antoine Lutti1, Chloe Hutton1, Jorg Stadler2, Oliver Josephs1, Oliver Speck3, Claus Tempelmann4, Johannes Bernarding5, Nikolaus Weiskopf1

1Wellcome Trust Centre for Neuroimaging, Institute of Neurology, University College London, London, United Kingdom; 2Special Lab Non-Invasive Brain Imaging, Leibniz Institute for Neurobiology, Magdeburg, Germany; 3Dept. Biomedical Magnetic Resonance, Institute for Experimental Physics , Otto-von-Guericke University, Magdeburg, Germany; 4Department of Neurology, Otto-von-Guericke University, Magdeburg, Germany; 5Institute for Biometry and Medical Informatics, Faculty of Medicine, Otto-von-Guericke-University, Magdeburg, Germany

Spatial inhomogeneities in the radio-frequency (RF) field (B1) increase with field strength affecting quantification and image contrast. Fast and robust whole-brain B1 mapping methods are therefore essential to correct for B1 inhomogeneities at ultra-high fields. Here we optimize a SE/STE 3D EPI method for rapid B1 mapping at 7T, addressing severe off resonance effects and reducing sensitivity to transverse coherence effects. We demonstrate the robustness of this B1 mapping technique and illustrate its accuracy by correcting for B1 inhomogeneities in T1 maps.