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Abstract #4199

Variability of B1+ and B0 fields in the human brain at 7T.

William T Clarke1, Olivier Mougin2, Ian D Driver3, Catarina Rua4, Susan Francis2, Richard Bowtell2, Richard Wise3, Adrian Carpenter4, Keith Muir5, and Stuart Clare1

1Wellcome Centre for Integrative Neuroimaging, FMRIB, Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford, United Kingdom, 2Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, Nottingham, United Kingdom, 3Cardiff University Brain Research Imaging Centre, School of Psychology, Cardiff University, Cardiff, United Kingdom, 4Wolfson Brain Imaging Centre, Department of Clinical Neurosciences, University of Cambridge, Cambridge, United Kingdom, 5Institute of Neuroscience & Psychology, University of Glasgow, Glasgow, United Kingdom

B1+ and B0 whole brain field-maps were collected from three human subjects, on four different 7 tesla scanners. Three different scanner systems from two different vendors were used; all acquisitions used the same RF coil. The data was used to assess the inter-subject and inter-scanner variability, and to calculate typical field values over a range of different brain regions. Systematic difference in B1+ calibration and B0 shimming between scanners were found, necessitating user validated B1+ calibration and B0 shimming for quantitative multi-site studies.

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