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  1. ScienceDirect
    https://www.sciencedirect.com/science/article/pii/S1053811919304550

    Optically pumped magnetometers: From quantum origins to multi …

    • 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 r… See more

    Highlights

    ••
    We review the theoretical basis of OPMs.
    ••
    We … See more

    ScienceDirect
    1. Introduction

    Optically Pumped Magnetometers (OPMs) are capable of measuring very weak magnetic fields (femtotesla sensitivity) without the need for cryogenic cooling (Shah and … See more

    ScienceDirect
    2. History and non-technical overview

    2.1. A brief history
    Both MRI and OPMs rely on the manipulation of a quantum property know as spin (a property that underlies a particle's m… See more

    ScienceDirect
    3. Quantum basis of optical pumping

    3.1. Angular momentum
    In this context angular momentum refers to the quantum mechanical phenomenon that shares the same SI units of kgm2s−1with classical, N… See more

    ScienceDirect
    4. Signal equations

    4.1. Magnetic fields and matter: a steady state solution
    In the SERF regime relaxation is suppressed and, as we have seen a tuned laser can p… See more

    ScienceDirect
    Does the OPM array outperform the CTF array?
    The OPM array clearly outperforms the CTF array in the resolution of 16 independent 25 nA-m (ISR = 0.63). Correlation matrices clearly show few off-diagonal correlations, indicating less signal leakage for the OPM array.
    ncbi.nlm.nih.gov
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    Table of Contents
    Highlights
    1. Introduction
    2. History and non-technical overview
    3. Quantum basis of optical pumping
    4. Signal equations
    Does the OPM array outperform the CTF array?
     
  1. Studies of OPM Array
    ScienceDirect
    On-scalp MEG system utilizing an actively shielded array of optically-pumped magnetometers
    The spatial resolution of magnetoencephalography (MEG) can be increased from that of conventional SQUID-based systems by employing on-scalp sensor arrays of e.g. optically-pumped magnetometers (OPMs). However, OPMs reach sufficient sensitivity for neuromagnetic measurements only when operated in a v...
    Published: 2019/07/01
    Cited By: 0
    Keywords: Optically-p…
    National Center for Biotechnology Information
    On-scalp magnetocorticography with optically pumped magnetometers: Simulated performance in resolving simultaneous sources
    Although other invasive electrophysiological approaches such as microarrays (Truccolo et al., 2011) and stereotactic EEG exist (Nagahama et al., 2018), the gold standard for high-resolution mapping of the cortex is invasive electrocorticography (ECoG). Because of the high risks of morbidity and mort...
    Author: Allison C. Nug…
    Published: 2022/06
    DOI: 10.1016/j.ynirp.20…
    ScienceDirect
    Using OPM-MEG in contrasting magnetic environments
    Magnetoencephalography (MEG) has been revolutionised by optically pumped magnetometers (OPMs). “OPM-MEG” offers higher sensitivity, better spatial resolution, and lower cost than conventional instrumentation based on superconducting quantum interference devices (SQUIDs). Moreover, because OPMs are s...
    Published: 2022/06/01
    Cited By: 0
    DOI: 10.1016/j.neuroim…
    National Center for Biotechnology Information
    Performance Analysis of Optically Pumped 4He Magnetometers vs. Conventional SQUIDs: From Adult to Infant Head Models
    Optically pumped magnetometers (OPMs) are new, room-temperature alternatives to superconducting quantum interference devices (SQUIDs) for measuring the brain’s magnetic fields. The most used OPM in MagnetoEncephaloGraphy (MEG) are based on alkali atoms operating in the spin-exchange relaxation-free ...
    Author: Saeed Zahran…
    Published: 2022/04
    Publication: Sensors (…
    National Center for Biotechnology Information
    Magnetic Source Imaging Using a Pulsed Optically Pumped Magnetometer Array
    Magnetic source imaging refers to reconstructing the magnetic and current dipoles underlying measured magnetic field maps. Magnetic source imaging has a wide range of applications such as magnetoencephalography (MEG) [1–5], magnetocardiography (MCG) [6–9], material science [10–12], printed-circuit-b...
    Author: Amir Borna, T…
    Published: 2019/02
    DOI: 10.1109/TIM.2018…
    arXiv.org
    Calibration and localization of optically pumped magnetometers using electromagnetic coils
    In this paper, we propose a method to estimate the position, orientation and gain of a magnetic field sensor using a set of (large) electromagnetic coils. We apply the method for calibrating an array of optically pumped magnetometers (OPMs) for magnetoencephalography (MEG). We first measure the magn...
    Author: Iivanainen, Jo…
    Published: 2022/03/09
    Page Count: 21
  2. Cell Press
    https://www.cell.com/trends/neurosciences/f…

    Magnetoencephalography with optically pumped …

    Jun 29, 2022 · By exploiting quantum sensors, known as optically pumped magnetometers (OPMs), ‘OPM-MEG’ has the potential to dramatically outperform the current state of the art, promising enhanced data quality (better sensitivity …

  3. ScienceDirect
    https://www.sciencedirect.com/science/article/pii/S1053811919301958

    On-scalp MEG system utilizing an actively shielded array of …

  4. IEEE Xplore
    https://ieeexplore.ieee.org/document/10373063

    Real-Time Localization of OPMs in a Flexible Array During MEG ...

  5. National Center for Biotechnology Information
    https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9186482

    On-scalp magnetocorticography with optically pumped …

  6. Nature
    https://www.nature.com/articles/s41398-024-03047-y

    Applications of OPM-MEG for translational neuroscience: a …

  7. Cell Press
    https://www.cell.com/trends/neurosciences…

    Whole-head OPM-MEG enables noninvasive …

    May 5, 2021 · A recent paper by Boto et al. established reliability of noninvasive functional connectivity measurements with a new whole-head optically pumped magnetometer magnetoencephalography (OPM-MEG) system. This rapidly …

  8. ScienceDirect
    https://www.sciencedirect.com/science/article/pii/S1053811922002130

    Using OPM-MEG in contrasting magnetic environments

  9. National Center for Biotechnology Information
    https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9024855

    Performance Analysis of Optically Pumped 4He Magnetometers vs ...

  10. MDPI
    https://www.mdpi.com/1424-8220/22/8/3…

    Performance Analysis of Optically Pumped 4He …

    Apr 18, 2022 · The OPMn array, and notably the OPMa array, gave smaller PLE and SD values, thus confirming that OPM arrays provide more accurate, focused brain source localization in children and infants. We observed a significant …

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