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Abstract #1459

Numerical assessment of a multi-coil shimming system in human brain MRI

Pei-Yan Li1, Yi-Tien Li1,2, and Fa-Hsuan Lin3,4

1Institute of Biomedical Engineering, National Taiwan University, Taipei, Taiwan, 2Taipei Medical University - Shuang Ho Hospital, Taipei, Taiwan, 3Department of Medical Biophysics, University of Toronto, Toronto, ON, Canada, 4Department of Neuroscience and Biomedical Engineering, Aalto University, Espoo, Finland

We numerically evaluated the performance of multi-coil shimming in human brain using an array of up to 1,000 coils with realistic off-resonance distributions of 37 healthy participants. The average and variation of shim current distributions were revealed. Singular Value Decomposition suggested orthogonal current modes to reduce off-resonance. The first 6 current modes accounted for about 90% of the variance of shim current distributions. They achieved shimming performance comparable to the 5th-order and 4th-order spherical harmonic in global and slice-selective shimming, respectively.

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