Impact of third order shim coils on gradient-magnet interactions and gradient waveform fidelity

Motivation: Third order shim coils can impact gradient-magnet interactions with consequences on image quality and magnet safety. Goal(s): To demonstrate the influence of third order shim coils on the SC72 gradient coil using field and vibration measurements. Approach: The gradient transfer function was measured at 11.7T (Iseult) and at 7T (Terra) with and without connection of the 3rd order shim coils. Vibration measurements were carried out on Iseult from 0 to 11.7T in the two configurations as well. Results: The data demonstrate a drastic influence of the 3rd order shim coils and their circuits. Impact: The work suggests caution when using third order shim coils at 7T and above. It also paves the way for further investigations to improve gradient waveform fidelity.

Authors

Publication Details

Journal
Proceedings on CD-ROM - International Society for Magnetic Resonance in Medicine. Scientific Meeting and Exhibition/Proceedings of the International Society for Magnetic Resonance in Medicine, Scientific Meeting and Exhibition
Published
2024-11-26
DOI
https://doi.org/10.58530/2024/0906
Primary Topic
Superconducting Materials and Applications
Type
article
Field-Weighted Citation Impact
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article

Impact of third order shim coils on gradient-magnet interactions and gradient waveform fidelity

Sajjad Feizollah, Caroline Le Ster, Alexis Amadon, Franck Mauconduit et al.
Proceedings on CD-ROM - International Society for Magnetic Resonance in Medicine. Scientific Meeting and Exhibition/Proceedings of the International Society for Magnetic Resonance in Medicine, Scientific Meeting and Exhibition
Superconducting Materials and Applications
article

Impact of third order shim coils on gradient-magnet interactions and gradient waveform fidelity

Sajjad Feizollah, Caroline Le Ster, Alexis Amadon, Franck Mauconduit, J. Belorgey, Alexander J. S. Beckett, Quentin Guihard, David A. Feinberg, Olivier Dubois, Vincent Gras, Klaus Scheffler, Philipp Ehses, Nicolas Boulant, Christine Tardif, Dario Bosch, H. Lannou, Kâmil Uǧurbil, L. Quettier, Xiaoping Wu, Denis Le Bihan, Alexandre Vignaud, Guillaume Dilasser, G. Aubert, F. Molinié, C. Bonnelye, An T. Vu, Klaas P. Pruessmann, F. Nunio, Simon Gross, David O. Brunner, Tony Stöcker
article en

Abstract

Motivation: Third order shim coils can impact gradient-magnet interactions with consequences on image quality and magnet safety. Goal(s): To demonstrate the influence of third order shim coils on the SC72 gradient coil using field and vibration measurements. Approach: The gradient transfer function was measured at 11.7T (Iseult) and at 7T (Terra) with and without connection of the 3rd order shim coils. Vibration measurements were carried out on Iseult from 0 to 11.7T in the two configurations as well. Results: The data demonstrate a drastic influence of the 3rd order shim coils and their circuits. Impact: The work suggests caution when using third order shim coils at 7T and above. It also paves the way for further investigations to improve gradient waveform fidelity.

Proceedings on CD-ROM - International Society for Magnetic Resonance in Medicine. Scientific Meeting and Exhibition/Proceedings of the International Society for Magnetic Resonance in Medicine, Scientific Meeting and Exhibition
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