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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