Precision magnetic field modelling and control for wearable magnetoencephalography

Rea, Molly; Holmes, Niall; Hill, Ryan M; Boto, Elena; Leggett, James; Edwards, Lucy J; David 4 Woolger; Dawson, Eliot; Shah, Vishal; Osborne, James; Bowtell, Richard; Brookes, Matthew J

Abstract

Optically-pumped magnetometers (OPMs) are highly sensitive, compact magnetic field sensors, which offer a viable alternative to cryogenic sensors (superconducting quantum interference devices – SQUIDs) for magnetoencephalography (MEG). With the promise of a wearable system that offers lifespan compliance, enables movement during scanning, and provides higher quality data, OPMs could drive a step change in MEG instrumentation. However, this potential can only be realised if background magnetic fields are appropriately controlled, via a combination of optimised passive magnetic screening (i.e. enclosing the system in layers of high-permeability materials), and electromagnetic coils to further null the remnant magnetic field. In this work, we show that even in an OPM-optimised passive shield with extremely low (

Citation

Rea, M., Holmes, N., Hill, R. M., Boto, E., Leggett, J., Edwards, L. J., …Brookes, M. J. (2021). Precision magnetic field modelling and control for wearable magnetoencephalography. NeuroImage, 241, Article 118401. https://doi.org/10.1016/j.neuroimage.2021.118401

• Journal Article Type: Article
• Acceptance Date: Jul 13, 2021
• Online Publication Date: Jul 15, 2021
• Publication Date: Nov 1, 2021
• Deposit Date: Jul 15, 2021
• Publicly Available Date: Jul 22, 2021
• Journal: NeuroImage
• Print ISSN: 1053-8119
• Electronic ISSN: 1095-9572
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 241
• Article Number: 118401
• DOI: https://doi.org/10.1016/j.neuroimage.2021.118401
• Public URL: https://nottingham-repository.worktribe.com/output/5786571
• Publisher URL: https://www.sciencedirect.com/science/article/pii/S1053811921006741
• Additional Information: © 2021 Published by Elsevier Inc. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)