Optically pumped magnetometers: From quantum origins to multi-channel magnetoencephalography
By T. Tierney, N. Holmes, S. Mellor, J. López, Gillian Roberts, R. Hill, E. Boto, J. Leggett, V. Shah, Matthew J. Brookes and 2 more. NeuroImage, 2019
325 citations recorded by the source corpus.
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.
Subfields: Atomic and Molecular Physics, and Optics, Cognitive Neuroscience, Radiology, Nuclear Medicine and Imaging
View Paper: https://www.semanticscholar.org/paper/b5d9cf054528e5f84be08bc39067c0c1db9c6007
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In Atomic and Molecular Physics, and Optics
Citations in the corpus
- Quantum technology for military applications (2021, background): “pumped magnetometers [287]—can enable high-resolution magnetoencephalography for”
- Revolutionizing Pediatric Neurophysiology With Magnetoencephalography (2026, unknown): “…(Schofield et al. 2024) have shown promise in allowing movement throughout the magnetically shielded room (Holmes et al. 2023b), though more work in this realm is needed before establishing OPM as a truly ambulatory technology (see also methods in (Tierney et al. 2019; Brookes et al. 2022)).”