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Improving brain B0 shimming using an easy and accessible multi-coil shim array at ultra-high field
Name
10334_2022_Article_1014.pdf
Size
1.02 MB
Format
Adobe PDF
Checksum (MD5)
d67b31fd4a4f56414557ac3faabd09c2
Author(s)
Boer, Vincent O.
Pedersen, Jan O.
Arango, Nick
Kuang, Irene
Stockmann, Jason
Petersen, Esben T.
Date Issued
May 5, 2022
Publisher
Springer International Publishing
Citation
Boer, Vincent O., Pedersen, Jan O., Arango, Nick, Kuang, Irene, Stockmann, Jason et al. 2022. "Improving brain B0 shimming using an easy and accessible multi-coil shim array at ultra-high field."
Version
Final published version
Abstract
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.
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Creative Commons Attribution
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1007/s10334-022-01014-6
