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  A 31-channel integrated “AC/DC” B0 shim and radiofrequency receive array coil for improved 7T MRI

Stockmann, J., Arango, N., Witzel, T., Mareyam, A., Sappo, C., Zhou, J., et al. (2022). A 31-channel integrated “AC/DC” B0 shim and radiofrequency receive array coil for improved 7T MRI. Magnetic Resonance in Medicine, 87(2), 1074-1092. doi:10.1002/mrm.29022.

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 Creators:
Stockmann, JP, Author
Arango, NS, Author
Witzel, T, Author
Mareyam, A, Author
Sappo, C, Author
Zhou, J1, 2, Author              
Jenkins, L, Author
Craven-Brightman, L, Author
Milshteyn, E, Author
Davids, M, Author
Hoge, WS, Author
Sliwiak, M, Author
Nasr, S, Author
Keil, B, Author
Adalsteinsson, E, Author
Guerin, B, Author
White, JK, Author
Setsompop, K, Author
Polimeni, JR, Author
Wald, LL, Author
Affiliations:
1Department High-Field Magnetic Resonance, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497796              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, Spemannstrasse 38, 72076 Tübingen, DE, ou_1497794              

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 Abstract: Purpose: To test an integrated "AC/DC" array approach at 7T, where B0 inhomogeneity poses an obstacle for functional imaging, diffusion-weighted MRI, MR spectroscopy, and other applications. Methods: A close-fitting 7T 31-channel (31-ch) brain array was constructed and tested using combined Rx and ΔB0 shim channels driven by a set of rapidly switchable current amplifiers. The coil was compared to a shape-matched 31-ch reference receive-only array for RF safety, signal-to-noise ratio (SNR), and inter-element noise correlation. We characterize the coil array's ability to provide global and dynamic (slice-optimized) shimming using ΔB0 field maps and echo planar imaging (EPI) acquisitions. Results: The SNR and average noise correlation were similar to the 31-ch reference array. Global and slice-optimized shimming provide 11% and 40% improvements respectively compared to baseline second-order spherical harmonic shimming. Birdcage transmit coil efficiency was similar for the reference and AC/DC array setups. Conclusion: Adding ΔB0 shim capability to a 31-ch 7T receive array can significantly boost 7T brain B0 homogeneity without sacrificing the array's rdiofrequency performance, potentially improving ultra-high field neuroimaging applications that are vulnerable to off-resonance effects.

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 Dates: 2021-102022-02
 Publication Status: Published in print
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 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1002/mrm.29022
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Title: Magnetic Resonance in Medicine
Source Genre: Journal
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Publ. Info: New York : Wiley-Liss
Pages: - Volume / Issue: 87 (2) Sequence Number: - Start / End Page: 1074 - 1092 Identifier: ISSN: 0740-3194
CoNE: https://pure.mpg.de/cone/journals/resource/954925538149