Abstract #1459

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

Pei-Yan Li¹, Yi-Tien Li^1,2, and Fa-Hsuan Lin^3,4

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 5^th-order and 4^th-order spherical harmonic in global and slice-selective shimming, respectively.

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