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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