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Abstract #5210

Slice-wise first-order shimming of the human spinal cord at 7T

S. Johanna Vannesjo1, Yuhang Shi1, Irene Tracey1, Karla L. Miller1, and Stuart Clare1

1FMRIB centre, Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford, United Kingdom

Spinal cord imaging would benefit from the SNR increase at ultra-high field, to depict small structures inside the cord. However, higher background field strengths also increase susceptibility-induced B0 field distortions, causing image distortions and signal dropouts. To improve field homogeneity, we here implement slice-wise first-order shimming in the cervical spinal cord at 7T. The slice-wise shim settings were calculated based on a B0 field map and a semi-automatically generated spinal cord mask. We demonstrate that the slice-wise shims can improve signal levels in a high-resolution anatomical multi-echo GRE sequence.

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