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- Title
Improving brain B<sub>0</sub> shimming using an easy and accessible multi-coil shim array at ultra-high field.
- Authors
Boer, Vincent Oltman; Pedersen, Jan Ole; Arango, Nick; Kuang, Irene; Stockmann, Jason; Petersen, Esben Thade
- 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.
- Subjects
MAGNETIC resonance imaging
- Publication
MAGMA: Magnetic Resonance Materials in Physics, Biology & Medicine, 2022, Vol 35, Issue 6, p943
- ISSN
0968-5243
- Publication type
Article
- DOI
10.1007/s10334-022-01014-6