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Abstract #2379

In vivo comparison of B1 mapping techniques for hip joint imaging at 7 Tesla

Oliver Kraff 1 , Andrea Lazik 1,2 , Daniel Brenner 3 , Desmond H.Y. Tse 4,5 , Qi Duan 6 , Soeren Johst 1 , Harald H. Quick 1,7 , and Mark E. Ladd 1,8

1 Erwin L. Hahn Institute for MRI, University Duisburg-Essen, Essen, Germany, 2 Diagnostic and Interventional Radiology and Neuroradiology, University Hospital Essen, Germany, 3 German Center for Neurodegenerative Diseases (DZNE), Bonn, Germany, 4 Neuropsychology and Psychopharmacology, Maastricht University, Netherlands, 5 Radiology, Maastricht University MC, Netherlands, 6 Adv. MRI Section, LFMI, NINDS, National Institutes of Health, MD, United States, 7 Highfield and Hybrid MR Imaging, University Hospital Essen, Germany, 8 Medical Physics in Radiology, German Cancer Research Center (DKFZ), Germany

Three well-established B1 mapping techniques (AFI, BSS, and DREAM) were evaluated regarding quality and reproducibility for large cross-section mapping in vivo at 7 Tesla. B1 maps were obtained in 6 healthy volunteers with two standard RF shims applied (CP+ and CP2+) using an eight-channel transmit/receive RF body coil. Deviation between scan and rescan for mean B1 and maximum B1, as well as the mean ratio of zero to nonzero values within the maps were assessed to compare the methods and to rate their applicability for functional imaging of the hip joints at 7T.

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