Cited by 128Atomic and Subatomic Physics ResearchElectromagnetic Compatibility and MeasurementsCharacterization and Applications of Magnetic Nanoparticles

The DOI matches its Crossref record; 31 of the 31 references it cites were found in a registry or an index.

A lightweight magnetically shielded room with active shielding

Open access

Abstract

Magnetically shielded rooms (MSRs) use multiple layers of materials such as MuMetal to screen external magnetic fields that would otherwise interfere with high precision magnetic field measurements such as magnetoencephalography (MEG). Optically pumped magnetometers (OPMs) have enabled the development of wearable MEG systems which have the potential to provide a motion tolerant functional brain imaging system with high spatiotemporal resolution. Despite significant promise, OPMs impose stringent magnetic shielding requirements, operating around a zero magnetic field resonance within a dynamic range of ± 5 nT. MSRs developed for OPM-MEG must therefore effectively shield external sources and provide a low remnant magnetic field inside the enclosure. Existing MSRs optimised for OPM-MEG are expensive, heavy, and difficult to site. Electromagnetic coils are used to further cancel the remnant field inside the MSR enabling participant movements during OPM-MEG, but present coil systems are challenging to engineer and occupy space in the MSR limiting participant movements and negatively impacting patient experience. Here we present a lightweight MSR design (30% reduction in weight and 40–60% reduction in external dimensions compared to a standard OPM-optimised MSR) which takes significant steps towards addressing these barriers. We also designed a ‘window coil’ active shielding system, featuring a series of simple rectangular coils placed directly onto the walls of the MSR. By mapping the remnant magnetic field inside the MSR, and the magnetic field produced by the coils, we can identify optimal coil currents and cancel the remnant magnetic field over the central cubic metre to just |B|= 670 ± 160 pT. These advances reduce the cost, installation time and siting restrictions of MSRs which will be essential for the widespread deployment of OPM-MEG.

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Crossref · 10.1038/s41598-022-17346-1

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  • OPM-MEG experiments involving participant motion require an OPM-optimised MSR with a very low remnant magnetic field and active magnetic shielding.

    “These constraints mean that OPM-MEG experiments involving participant motion require an OPM-optimised MSR with a very low remnant magnetic field along with ‘active’ magnetic shielding”

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Research works printed but not linked: 1

  1. Juhas, A., Pekari, N. & Toepfer, H. Magnetic field of rectangular current loop with sides parallel and perpendicular to the surface of high-permeability material. SJEE 11, 701–717 (2014).

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Metadata

Authors
Holmes, N., Rea, M., Chalmers, J., Leggett, J., Edwards, L. J., Nell, P., Pink, S., Patel, P., Wood, J., Murby, N., Woolger, D., Dawson, E., Mariani, C., Tierney, T. M., Mellor, S., O’Neill, G. C., Boto, E., Hill, R. M., Shah, V., Osborne, J., Pardington, R., Fierlinger, P., Barnes, G. R., Glover, P., Brookes, M. J., & Bowtell, R.
Affiliations
  • University of Nottingham (GB)
  • Wellcome Centre for Human Neuroimaging (GB)
  • QuSpin (United States) (US)
  • Technical University of Munich (DE)
Corresponding author
Holmes, Niall
Venue
Scientific Reports
Published
2022-08-09
Volume
12
Issue
1
Pages
13561-13561
ISSN
2045-2322 (ISSN-L)
OpenAlex
W4291020559
Cited by
121
References
31
Citations by year
2026: 24 · 2025: 39 · 2024: 34 · 2023: 22 · 2022: 2
FWCI
9.95
Type
journal article
Language
en
Open access
Locations
  • Scientific Reports (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Repository@Nottingham (University of Nottingham) (publishedVersion, other-oa)
  • Repository@Nottingham (University of Nottingham) (submittedVersion, cc-by)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • UCL Discovery (University College London) (submittedVersion)
  • mediaTUM – the media and publications repository of the Technical University Munich (Technical University Munich) (submittedVersion, other-oa)
Funders
  • Engineering and Physical Sciences Research Council (EP/T001046/1)
  • Innovate UK (104604)
  • Wellcome Trust (203257/Z/16/Z)
Topics
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Atomic and Subatomic Physics Research
  • Physical Sciences › Engineering › Electrical and Electronic Engineering › Electromagnetic Compatibility and Measurements
  • Physical Sciences › Engineering › Biomedical Engineering › Characterization and Applications of Magnetic Nanoparticles
Keywords
magnetically shielded room, active magnetic shielding, optically pumped magnetometers, mu-metal, electromagnetic coils
MeSH terms
Brain, Humans, Magnetic Resonance Imaging, Magnetic Resonance Spectroscopy, Magnetoencephalography, Functional Neuroimaging, Magnetic Fields

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