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Optically pumped magnetometers: From quantum origins to multi-channel magnetoencephalography

Tierney, TM; Holmes, N; Mellor, S; López, JD; Roberts, G; Hill, RM; Boto, E; ... Barnes, GR; + view all (2019) Optically pumped magnetometers: From quantum origins to multi-channel magnetoencephalography. Neuroimage , 199 pp. 598-608. 10.1016/j.neuroimage.2019.05.063. Green open access

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Abstract

Optically Pumped Magnetometers (OPMs) have emerged as a viable and wearable alternative to cryogenic, superconducting MEG systems. This new generation of sensors has the advantage of not requiring cryogenic cooling and as a result can be flexibly placed on any part of the body. The purpose of this review is to provide a neuroscience audience with the theoretical background needed to understand the physical basis for the signal observed by OPMs. Those already familiar with the physics of MRI and NMR should note that OPMs share much of the same theory as the operation of OPMs rely on magnetic resonance. This review establishes the physical basis for the signal equation for OPMs. We re-derive the equations defining the bounds on OPM performance and highlight the important trade-offs between quantities such as bandwidth, sensor size and sensitivity. These equations lead to a direct upper bound on the gain change due to cross-talk for a multi-channel OPM system.

Type: Article
Title: Optically pumped magnetometers: From quantum origins to multi-channel magnetoencephalography
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.neuroimage.2019.05.063
Publisher version: https://doi.org/10.1016/j.neuroimage.2019.05.063
Language: English
Additional information: This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > UCL Queen Square Institute of Neurology
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > UCL Queen Square Institute of Neurology > Imaging Neuroscience
URI: https://discovery.ucl.ac.uk/id/eprint/10075433
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