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Magnetoencephalography with optically pumped magnetometers (OPM-MEG): the next generation of functional neuroimaging

TRENDS IN NEUROSCIENCES (2022)

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Article Engineering, Electrical & Electronic

Thermal Analysis of Wearable OPM-MEG Array System for Auditory Evoked Experiments

Maotong Pang et al.

Summary: In this paper, a verified temperature field model of the OPM-MEG array is developed and a more efficient thermal management scheme using water-cooling design is proposed. The experiments show that temperature control using water cooling system can reduce the location error in auditory evoked experiments.

IEEE SENSORS JOURNAL (2022)

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Article Neurosciences

Triaxial detection of the neuromagnetic field using optically-pumped magnetometry: feasibility and application in children

Elena Boto et al.

Summary: Optically-pumped magnetometers (OPMs) are a viable alternative to superconducting sensors for magnetoencephalography (MEG), with advantages such as flexibility, uniform coverage, better data quality, and lower cost. This study introduces a novel triaxial OPM sensor that can accurately and sensitively measure magnetic fields, showing comparable performance to conventional OPMs. A child-friendly 3D-printed OPM-helmet is also proposed, demonstrating the feasibility of triaxial measurement in pediatric populations.

NEUROIMAGE (2022)

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Article Radiology, Nuclear Medicine & Medical Imaging

On-Scalp Optically Pumped Magnetometers versus Cryogenic Magnetoencephalography for Diagnostic Evaluation of Epilepsy in School-aged Children

Odile Feys et al.

Summary: This study compared the effectiveness of cryogenic and on-scalp MEG in detecting and localizing focal interictal epileptiform discharges (IEDs) in children with epilepsy. The results showed that on-scalp MEG had higher IED amplitudes and signal-to-noise ratios compared to cryogenic MEG, and the localization value was similar between the two modalities.

RADIOLOGY (2022)

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Article Chemistry, Analytical

Calibration and Localization of Optically Pumped Magnetometers Using Electromagnetic Coils

Joonas Iivanainen et al.

Summary: This paper proposes a method for calibrating and localizing magnetic field sensors using electromagnetic coils. The method is applied to optically pumped magnetometers in magnetoencephalography. By measuring the coil fields, modeling them, and minimizing the errors, the sensor parameters can be obtained. Experimental results confirm the feasibility of this method.

SENSORS (2022)

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Article Chemistry, Analytical

Simulation Study of Different OPM-MEG Measurement Components

Urban Marhl et al.

Summary: This study explored the effect of combining multiple directions of magnetic field on source localization and found that the field direction normal to the scalp has a higher signal-to-noise ratio and is less affected by ambient noise, making it the optimal choice for source localization when only one field direction can be measured. Additionally, combining multiple field directions greatly improves the source localization results when using a low number of OPMs. Furthermore, sensors closer to the brain are more suitable for localizing deeper sources.

SENSORS (2022)

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Article Physiology

Peripheral Nerve Magnetoneurography With Optically Pumped Magnetometers

Yifeng Bu et al.

Summary: Electrodiagnosis is commonly used for diagnosing peripheral nerve diseases, and optically pumped magnetometers (OPMs) show potential as a sensitive tool for detecting sensory nerve action potentials and the Hoffmann reflex.

FRONTIERS IN PHYSIOLOGY (2022)

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Article Clinical Neurology

Optically pumped magnetometers reveal fasciculations non-invasively

Justus Marquetand et al.

Summary: This study demonstrated that fasciculations could be detected non-invasively using optically pumped magnetometers (OPM), but other forms of spontaneous muscle activity were not detectable with current OPM technology. Further technical solutions are proposed to improve detection of other forms of spontaneous activity.

CLINICAL NEUROPHYSIOLOGY (2021)

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Article Neurosciences

Mouth magnetoencephalography: A unique perspective on the human hippocampus

Tim M. Tierney et al.

Summary: Traditional MEG brain imaging scanners are highly sensitive to superficial brain structures due to their rigid sensor array design. However, new technology using optical pumping allows for more flexible sensor placement. The study explored magnetic fields generated by a human hippocampus model across the scalp and the roof of the mouth, finding that a mouth sensor showed promising results in detecting hippocampal activity.

NEUROIMAGE (2021)

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Article Neurosciences

Precision magnetic field modelling and control for wearable magnetoencephalography

Molly Rea et al.

Summary: This study introduces the potential of optically-pumped magnetometers (OPMs) in magnetoencephalography (MEG) experiments and emphasizes the importance of controlling background magnetic fields. The authors propose a magnetic field mapping technique that accurately reconstructs field magnitude and compensates for it through an electromagnetic coil system, significantly reducing low-frequency interference. This technology can improve data quality in experiments, especially those measuring low-frequency oscillations or encouraging head movement.

NEUROIMAGE (2021)

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Article Neurosciences

Contactless measurements of retinal activity using optically pumped magnetometers

Britta U. Westner et al.

Summary: Optically pumped magnetometers (OPMs) offer a flexible and contactless alternative for measuring brain and retinal activity without the need for cryogenic cooling. Magnetoretinographic (MRG) activity shows familiar signals similar to electroretinogram and shares a significant amount of information in both simultaneous and separate measurements.

NEUROIMAGE (2021)

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Article Neurosciences

Using OPMs to measure neural activity in standing, mobile participants

Robert A. Seymour et al.

Summary: This study demonstrates the potential of OP-MEG systems to capture neural activity during naturalistic paradigms involving movement. The results show that OP-MEG can record event-related fields from the auditory cortex consistently across different movement conditions. The study highlights the exciting possibility of using OP-MEG for scanning populations like young children who are difficult to study with stationary MEG systems.

NEUROIMAGE (2021)

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Article Neurosciences

Theoretical advantages of a triaxial optically pumped magnetometer magnetoencephalography system

Matthew J. Brookes et al.

Summary: The optically pumped magnetometer (OPM) is an effective method for detecting magnetic fields generated by human brain activity, offering advantages of size, weight, and flexibility compared to traditional detectors. Optimized triaxial MEG array design can significantly improve the ability to differentiate real brain activity from magnetic interference sources.

NEUROIMAGE (2021)

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Article Neurosciences

Measuring functional connectivity with wearable MEG

Elena Boto et al.

Summary: Optically-pumped magnetometers (OPMs) have the potential to improve data quality and wearability in magnetoencephalography (MEG), with results showing high similarity to state-of-the-art cryogenic MEG systems. This indicates the potential for OPMs to ultimately replace traditional sensors for MEG measurements.

NEUROIMAGE (2021)

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Article Optics

Helium-4 magnetometers for room-temperature biomedical imaging: toward collective operation and photon-noise limited sensitivity

William Fourcault et al.

Summary: Optically-pumped magnetometers are valuable for imaging biological magnetic signals without cryogenic cooling. Recent advancements have led to improved sensitivities and wider dynamic ranges for these magnetometers.

OPTICS EXPRESS (2021)

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Article Biology

Practical real-time MEG-based neural interfacing with optically pumped magnetometers

Benjamin Wittevrongel et al.

Summary: OPM-MEG demonstrates robust single-trial analysis in real-time 'mind-spelling' applications with an average accuracy of 97.7%. This indicates the potential of OPM-MEG to effectively utilize neuro-magnetic brain responses in a practical and flexible manner, paving the way for a wide range of new neural interface applications in the future.

BMC BIOLOGY (2021)

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Article Neurosciences

Measuring the cortical tracking of speech with optically-pumped magnetometers

Paul de Lange et al.

Summary: During continuous speech listening, the brain activity tracks the rhythmicity of speech at various frequencies, which can be effectively measured using wearable MEG with optically-pumped magnetometers (OPMs). Although measuring cortical tracking of speech (CTS) at frequencies below 4 Hz presents challenges, OPM-MEG shows promising results with improved spatial resolution and lifespan compliance. The study demonstrates that OPMs can be used for CTS assessment, offering new research opportunities to understand neural networks involved in speech tracking and potential alterations in language developmental disorders.

NEUROIMAGE (2021)

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Review Multidisciplinary Sciences

The present and future use of functional near-infrared spectroscopy (fNIRS) for cognitive neuroscience

Paola Pinti et al.

ANNALS OF THE NEW YORK ACADEMY OF SCIENCES (2020)

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Article Neurosciences

Potential of on-scalp MEG: Robust detection of human visual gamma-band responses

Joonas Iivanainen et al.

HUMAN BRAIN MAPPING (2020)

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Article Multidisciplinary Sciences

Non-Invasive Functional-Brain-Imaging with an OPM-based Magnetoencephalography System

Amir Borna et al.

PLOS ONE (2020)

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Article Clinical Neurology

Optically pumped magnetoencephalography in epilepsy

Umesh Vivekananda et al.

ANNALS OF CLINICAL AND TRANSLATIONAL NEUROLOGY (2020)

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Article Neurosciences

Multi-channel whole-head OPM-MEG: Helmet design and a comparison with a conventional system

Ryan M. Hill et al.

NEUROIMAGE (2020)

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Article Quantum Science & Technology

A conformal array of microfabricated optically-pumped first-order gradiometers for magnetoencephalography

N. V. Nardelli et al.

EPJ QUANTUM TECHNOLOGY (2020)

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Article Computer Science, Interdisciplinary Applications

Magnetoencephalography With Optically Pumped 4He Magnetometers at Ambient Temperature

Etienne Labyt et al.

IEEE TRANSACTIONS ON MEDICAL IMAGING (2019)

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Article Neurosciences

On-scalp MEG system utilizing an actively shielded array of optically-pumped magnetometers

Joonas Iivanainen et al.

NEUROIMAGE (2019)

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Article Neurosciences

Magnetoencephalography and the infant brain

Yu-Han Chen et al.

NEUROIMAGE (2019)

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Review Neurosciences

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

Tim M. Tierney et al.

NEUROIMAGE (2019)

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Article Multidisciplinary Sciences

Studying Brain Function in Children Using Magnetoencephalography

Hannah Rapaport et al.

JOVE-JOURNAL OF VISUALIZED EXPERIMENTS (2019)

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Article Neurosciences

Using optically pumped magnetometers to measure magnetoencephalographic signals in the human cerebellum

Chin-Hsuan Lin et al.

JOURNAL OF PHYSIOLOGY-LONDON (2019)

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Article Neurosciences

Imaging the human hippocampus with optically-pumped magnetoencephalography

Daniel N. Barry et al.

NEUROIMAGE (2019)

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Article Neurosciences

Wearable neuroimaging: Combining and contrasting magnetoencephalography and electroencephalography

Elena Boto et al.

NEUROIMAGE (2019)

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Article Neurosciences

Towards OPM-MEG in a virtual reality environment

Gillian Roberts et al.

NEUROIMAGE (2019)

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Article Multidisciplinary Sciences

A tool for functional brain imaging with lifespan compliance

Ryan M. Hill et al.

NATURE COMMUNICATIONS (2019)

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Article Multidisciplinary Sciences

Balanced, bi-planar magnetic field and field gradient coils for field compensation in wearable magnetoencephalography

Niall Holmes et al.

SCIENTIFIC REPORTS (2019)

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Article Neurosciences

Non-invasive laminar inference with MEG: Comparison of methods and source inversion algorithms

James J. Bonaiuto et al.

NEUROIMAGE (2018)

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Article Neurosciences

A bi-planar coil system for nulling background magnetic fields in scalp mounted magnetoencephalography

Niall Holmes et al.

NEUROIMAGE (2018)

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Article Multidisciplinary Sciences

Moving magnetoencephalography towards real-world applications with a wearable system

Elena Boto et al.

NATURE (2018)

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Article Neurosciences

Cognitive neuroscience using wearable magnetometer arrays: Non-invasive assessment of language function

Tim M. Tierney et al.

NEUROIMAGE (2018)

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Article Optics

Theory of a He-4 parametric-resonance magnetometer based on atomic alignment

Francois Beato et al.

PHYSICAL REVIEW A (2018)

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Article Clinical Neurology

The Importance of Properly Compensating for Head Movements During MEG Acquisition Across Different Age Groups

Eric Larson et al.

BRAIN TOPOGRAPHY (2017)

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Review Neurosciences

Magnetoencephalography for brain electrophysiology and imaging

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NATURE NEUROSCIENCE (2017)

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Article Neurosciences

Assessment and elimination of the effects of head movement on MEG resting-state measures of oscillatory brain activity

Eirini Messaritaki et al.

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Article Neurosciences

Measuring MEG closer to the brain: Performance of on-scalp sensor arrays

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NEUROIMAGE (2017)

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Article Neurosciences

A new generation of magnetoencephalography: Room temperature measurements using optically-pumped magnetometers

Elena Boto et al.

NEUROIMAGE (2017)

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Article Multidisciplinary Sciences

On the Potential of a New Generation of Magnetometers for MEG: A Beamformer Simulation Study

Elena Boto et al.

PLOS ONE (2016)

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Article Physics, Applied

Human magnetoencephalogram measurements using newly developed compact module of high-sensitivity atomic magnetometer

Keigo Kameda et al.

JAPANESE JOURNAL OF APPLIED PHYSICS (2015)

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Article Neurosciences

Online and offline tools for head movement compensation in MEG

Arjen Stolk et al.

NEUROIMAGE (2013)

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Article Engineering, Biomedical

A compact, high performance atomic magnetometer for biomedical applications

Vishal K. Shah et al.

PHYSICS IN MEDICINE AND BIOLOGY (2013)

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Article Engineering, Biomedical

Multi-sensor magnetoencephalography with atomic magnetometers

Cort N. Johnson et al.

PHYSICS IN MEDICINE AND BIOLOGY (2013)

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Article Clinical Neurology

Validation of head movement correction and spatiotemporal signal space separation in magnetoencephalography

Jukka Nenonen et al.

CLINICAL NEUROPHYSIOLOGY (2012)

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Article Clinical Neurology

Sensitivity and specificity of seizure-onset zone estimation by ictal magnetoencephalography

Mordekhay Medvedovsky et al.

EPILEPSIA (2012)

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Article Biochemical Research Methods

Magnetoencephalography with a chip-scale atomic magnetometer

T. H. Sander et al.

BIOMEDICAL OPTICS EXPRESS (2012)

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Article Physics, Applied

Magnetoencephalography with a two-color pump-probe, fiber-coupled atomic magnetometer

Cort Johnson et al.

APPLIED PHYSICS LETTERS (2010)

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Article Neurosciences

Head movements of children in MEG: Quantification, effects on source estimation, and compensation

Daniel T. Wehner et al.

NEUROIMAGE (2008)

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Article Physics, Applied

Magnetoencephalography with an atomic magnetometer

H. Xia et al.

APPLIED PHYSICS LETTERS (2006)

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Article Engineering, Biomedical

Spatiotemporal signal space separation method for rejecting nearby interference in MEG measurements

S Taulu et al.

PHYSICS IN MEDICINE AND BIOLOGY (2006)

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Article Engineering, Electrical & Electronic

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S Taulu et al.

IEEE TRANSACTIONS ON SIGNAL PROCESSING (2005)

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Article Physics, Multidisciplinary

High-sensitivity atomic magnetometer unaffected by spin-exchange relaxation

JC Allred et al.

PHYSICAL REVIEW LETTERS (2002)

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