Improving brain B0 shimming using an easy and accessible multi-coil shim array at ultra-high field

Vincent Oltman Boer*, Jan Ole Pedersen, Nick Arango, Irene Kuang, Jason Stockmann, Esben Thade Petersen

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

Object: Improve shimming capabilities of ultra-high field systems, with addition of an accessible low-complexity B0 shim array for head MRI at 7 T.
Materials and methods: An eight channel B0 shim coil array was designed as a tradeoff between shimming improvement and construction complexity, to provide an easy to use shim array that can be employed with the standard 7 T head coil. The array was interfaced using an open-source eight-channel shim amplifier rack. Improvements in field homogeneity for whole-brain and slice-based shimming were compared to standard second-order shimming, and to more complex higher order dynamic shimming and shim arrays with 32 and 48 channels.
Results: The eight-channel shim array provided 12% improvement in whole brain static shimming and provided 33% improvement when using slice-based shimming. With this, the eight-channel array performed similar to third-order dynamic shimming (without the need for higher order eddy current compensation). More complex shim arrays with 32 and 48 channels performed better, but require a dedicated RF coil.
Discussion: The designed eight-channel shim array provides a low-complexity and low-cost approach for improving B0 field shimming on an ultra-high field system. In both static and dynamic shimming, it provides improved B0 homogeneity over standard shimming.
Original languageEnglish
JournalMagnetic Resonance Materials in Physics, Biology and Medicine
Volume35
Pages (from-to)943–951
ISSN0968-5243
DOIs
Publication statusPublished - 2022

Keywords

  • B0 field
  • Magnetic resonance imaging
  • Multi-coil array
  • Shimming
  • Ultra-high field

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