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Abstract #2847

Investigating Liver B0 mapping at 7T: Comparison of respiration phase, shim volume size and body shim coil arrays

Stephen Bawden1,2, Olivier Mougin1, Abi Spicer1,2, Richard Bowtell1, Susan Francis1, and Penny Gowland1
1Sir Peter Mansfield Imaging Centre, University of Nottingham, Nottingham, United Kingdom, 2NIHR Nottingham Biomedical Research Centre, Nottingham University Hospitals NHS Trust, University of Nottingham, Nottingham, United Kingdom

Synopsis

Keywords: Liver, Shims

Motivation: Liver scanning at 7T opens new possibilities for metabolic research with greater spatial and spectral resolution and signal-to-noise ratios. However, B0 variability at 7T provides challenges for liver scanning. The addition of body shim coil arrays has been proposed to mitigate these effects.

Goal(s): Assess the impact of respiration, shim volume and shim arrays on B0 inhomogeneity in the liver at 7T.

Approach: B0 maps were acquired for varying shim settings and the standard deviations within a small sample volume were calculated and compared.

Results: Larger shim volumes provided more uniform B0 fields. Further work is needed to optimize surface shim coil arrays.

Impact: This study provides important information about the effects of respiration, shim volume size and using body shim coil arrays in 7T liver MRI/MRS. This data can be used in future studies to optimize shim routines and improve spectral line widths.

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