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All Outputs (31)

The neurodevelopmental trajectory of beta band oscillations: an OPM-MEG study (2024)
Journal Article
Rier, L., Rhodes, N., Pakenham, D., Boto, E., Holmes, N., Hill, R. M., …Brookes, M. J. (2024). The neurodevelopmental trajectory of beta band oscillations: an OPM-MEG study. eLife, Article 94561v1. https://doi.org/10.7554/eLife.94561.1

Neural oscillations mediate coordination of activity within and between brain networks, supporting cognition and behaviour. How these processes develop throughout childhood is not only a critical neuroscientific question but could also shed light on... Read More about The neurodevelopmental trajectory of beta band oscillations: an OPM-MEG study.

Designing Optimal Loop, Saddle, and Ellipse-Based Magnetic Coils by Spherical Harmonic Mapping (2023)
Journal Article
Hobson, P. J., Hardwicke, N. L., Davis, A., Smith, T. X., Morley, C., Packer, M., …Fromhold, M. (2023). Designing Optimal Loop, Saddle, and Ellipse-Based Magnetic Coils by Spherical Harmonic Mapping. IEEE Transactions on Instrumentation and Measurement, 72, Article 1005815. https://doi.org/10.1109/TIM.2023.3284138

Adaptable, low-cost, coils designed by carefully selecting the arrangements and geometries of simple primitive units are used to generate magnetic fields for diverse applications. These extend from magnetic resonance and fundamental physics experimen... Read More about Designing Optimal Loop, Saddle, and Ellipse-Based Magnetic Coils by Spherical Harmonic Mapping.

Tri-axial rubidium and helium optically pumped magnetometers for on-scalp magnetoencephalography recording of interictal epileptiform discharges: a case study (2023)
Journal Article
Feys, O., Corvilain, P., Labyt, E., Mahmoudzadeh, M., Routier, L., Sculier, C., …De Tiège, X. (2023). Tri-axial rubidium and helium optically pumped magnetometers for on-scalp magnetoencephalography recording of interictal epileptiform discharges: a case study. Frontiers in Neuroscience, 17, Article 1284262. https://doi.org/10.3389/fnins.2023.1284262

Cryogenic magnetoencephalography (MEG) enhances the presurgical assessment of refractory focal epilepsy (RFE). Optically pumped magnetometers (OPMs) are cryogen-free sensors that enable on-scalp MEG recordings. Here, we investigate the application of... Read More about Tri-axial rubidium and helium optically pumped magnetometers for on-scalp magnetoencephalography recording of interictal epileptiform discharges: a case study.

Portable single-beam cesium zero-field magnetometer for magnetocardiography (2023)
Journal Article
Dawson, R., O'Dwyer, C., Mrozowski, M. S., Irwin, E., McGilligan, J. P., Burt, D. P., …Riis, E. (2023). Portable single-beam cesium zero-field magnetometer for magnetocardiography. Journal of Optical Microsystems, 3(4), Article 044501. https://doi.org/10.1117/1.jom.3.4.044501

Optically pumped magnetometers (OPMs) are becoming common in the realm of biomagnetic measurements. We discuss the development of a prototype zero-field cesium portable OPM and its miniaturized components. Zero-field sensors operate in a very low sta... Read More about Portable single-beam cesium zero-field magnetometer for magnetocardiography.

Test-retest reliability of the human connectome: An OPM-MEG study (2023)
Journal Article
Rier, L., Michelmann, S., Ritz, H., Shah, V., Hill, R. M., Osborne, J., …Boto, E. (2023). Test-retest reliability of the human connectome: An OPM-MEG study. Imaging Neuroscience, 1, 1-20. https://doi.org/10.1162/imag_a_00020

Magnetoencephalography with optically pumped magnetometers (OPM-MEG) offers a new way to record electrophysiological brain function, with significant advantages over conventional MEG, including adaptability to head shape/size, free movement during sc... Read More about Test-retest reliability of the human connectome: An OPM-MEG study.

Benchtop magnetic shielding for benchmarking atomic magnetometers (2023)
Journal Article
Hobson, P. J., Holmes, N., Patel, P., Styles, B., Chalmers, J., Morley, C., …Fromhold, M. (2023). Benchtop magnetic shielding for benchmarking atomic magnetometers. IEEE Transactions on Instrumentation and Measurement, 72, Article 6007309. https://doi.org/10.1109/tim.2023.3293540

Here, a benchtop hybrid magnetic shield containing four mumetal cylinders and nine internal flexible printed circuit boards is designed, constructed, tested, and operated. The shield is designed specifically as a test-bed for building and operating u... Read More about Benchtop magnetic shielding for benchmarking atomic magnetometers.

An Iterative Implementation of the Signal Space Separation Method for Magnetoencephalography Systems with Low Channel Counts (2023)
Journal Article
Holmes, N., Bowtell, R., Brookes, M. J., & Taulu, S. (2023). An Iterative Implementation of the Signal Space Separation Method for Magnetoencephalography Systems with Low Channel Counts. Sensors, 23(14), Article 6537. https://doi.org/10.3390/s23146537

The signal space separation (SSS) method is routinely employed in the analysis of multichannel magnetic field recordings (such as magnetoencephalography (MEG) data). In the SSS method, signal vectors are posed as a multipole expansion of the magnetic... Read More about An Iterative Implementation of the Signal Space Separation Method for Magnetoencephalography Systems with Low Channel Counts.

Naturalistic Hyperscanning with Wearable Magnetoencephalography (2023)
Journal Article
Holmes, N., Rea, M., Hill, R. M., Boto, E., Leggett, J., Edwards, L. J., …Bowtell, R. (2023). Naturalistic Hyperscanning with Wearable Magnetoencephalography. Sensors, 23(12), Article 5454. https://doi.org/10.3390/s23125454

The evolution of human cognitive function is reliant on complex social interactions which form the behavioural foundation of who we are. These social capacities are subject to dramatic change in disease and injury; yet their supporting neural substra... Read More about Naturalistic Hyperscanning with Wearable Magnetoencephalography.

Enabling ambulatory movement in wearable magnetoencephalography with matrix coil active magnetic shielding (2023)
Journal Article
Holmes, N., Rea, M., Hill, R. M., Leggett, J., Edwards, L. J., Hobson, P. J., …Bowtell, R. (2023). Enabling ambulatory movement in wearable magnetoencephalography with matrix coil active magnetic shielding. NeuroImage, 274, Article 120157. https://doi.org/10.1016/j.neuroimage.2023.120157

The ability to collect high-quality neuroimaging data during ambulatory participant movement would enable a wealth of neuroscientific paradigms. Wearable magnetoencephalography (MEG) based on optically pumped magnetometers (OPMs) has the potential to... Read More about Enabling ambulatory movement in wearable magnetoencephalography with matrix coil active magnetic shielding.

Non-invasive measurements of ictal and interictal epileptiform activity using optically pumped magnetometers (2023)
Journal Article
Hillebrand, A., Holmes, N., Sijsma, N., O’Neill, G. C., Tierney, T. M., Liberton, N., …Barnes, G. R. (2023). Non-invasive measurements of ictal and interictal epileptiform activity using optically pumped magnetometers. Scientific Reports, 13(1), Article 4623. https://doi.org/10.1038/s41598-023-31111-y

Magneto- and electroencephalography (MEG/EEG) are important techniques for the diagnosis and pre-surgical evaluation of epilepsy. Yet, in current cryogen-based MEG systems the sensors are offset from the scalp, which limits the signal-to-noise ratio... Read More about Non-invasive measurements of ictal and interictal epileptiform activity using optically pumped magnetometers.

Measurement of Frontal Midline Theta Oscillations using OPM-MEG (2023)
Journal Article
Rhodes, N., Rea, M., Boto, E., Rier, L., Shah, V., Hill, R. M., …Brookes, M. J. (2023). Measurement of Frontal Midline Theta Oscillations using OPM-MEG. NeuroImage, 271, Article 120024. https://doi.org/10.1016/j.neuroimage.2023.120024

Optically pumped magnetometers (OPMs) are an emerging lightweight and compact sensor that can measure magnetic fields generated by the human brain. OPMs enable construction of wearable magnetoencephalography (MEG) systems, which offer advantages over... Read More about Measurement of Frontal Midline Theta Oscillations using OPM-MEG.

Turning OPM-MEG into a Wearable Technology (2022)
Book Chapter
Rhodes, N., Holmes, N., Hill, R., Barnes, G., Bowtell, R., Brookes, M., & Boto, E. (2022). Turning OPM-MEG into a Wearable Technology. In E. Labyt, T. Sander, & R. Wakai (Eds.), Flexible High Performance Magnetic Field Sensors: On-Scalp Magnetoencephalography and Other Applications (195-223). Springer International Publishing. https://doi.org/10.1007/978-3-031-05363-4_11

This chapter explores the use of optically pumped magnetometers (OPMs) as a tool for magnetoencephalography (MEG). Conventional MEG systems use superconducting quantum interference devices (SQUIDs) to measure the femto-Tesla-level magnetic fields at... Read More about Turning OPM-MEG into a Wearable Technology.

A lightweight magnetically shielded room with active shielding (2022)
Journal Article
Holmes, N., Rea, M., Chalmers, J., Leggett, J., Edwards, L. J., Nell, P., …Bowtell, R. (2022). A lightweight magnetically shielded room with active shielding. Scientific Reports, 12, Article 13561. https://doi.org/10.1038/s41598-022-17346-1

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 pump... Read More about A lightweight magnetically shielded room with active shielding.

On-Scalp Optically Pumped Magnetometers versus Cryogenic Magnetoencephalography for Diagnostic Evaluation of Epilepsy in School-aged Children (2022)
Journal Article
Feys, O., Corvilain, P., Aeby, A., Sculier, C., Holmes, N., Brookes, M., …De Tiège, X. (2022). On-Scalp Optically Pumped Magnetometers versus Cryogenic Magnetoencephalography for Diagnostic Evaluation of Epilepsy in School-aged Children. Radiology, 304(2), 429-434. https://doi.org/10.1148/radiol.212453

Background Magnetoencephalography (MEG) is an established method used to detect and localize focal interictal epileptiform discharges (IEDs). Current MEG systems house hundreds of cryogenic sensors in a rigid, one-size-fits-all helmet, which results... Read More about On-Scalp Optically Pumped Magnetometers versus Cryogenic Magnetoencephalography for Diagnostic Evaluation of Epilepsy in School-aged Children.

Using OPM-MEG in contrasting magnetic environments (2022)
Journal Article
Hill, R. M., Devasagayam, J., Holmes, N., Boto, E., Shah, V., Osborne, J., …Brookes, M. J. (2022). Using OPM-MEG in contrasting magnetic environments. NeuroImage, 253, Article 119084. https://doi.org/10.1016/j.neuroimage.2022.119084

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 interfere... Read More about Using OPM-MEG in contrasting magnetic environments.

Magnetic field design in a cylindrical high-permeability shield: The combination of simple building blocks and a genetic algorithm (2022)
Journal Article
Packer, M., Hobson, P. J., Davis, A., Holmes, N., Leggett, J., Glover, P., …Fromhold, T. M. (2022). Magnetic field design in a cylindrical high-permeability shield: The combination of simple building blocks and a genetic algorithm. Journal of Applied Physics, 131(9), Article 093902. https://doi.org/10.1063/5.0071986

Magnetically sensitive experiments and newly developed quantum technologies with integrated high-permeability magnetic shields require increasing control of their magnetic field environment and reductions in size, weight, power, and cost. However, ma... Read More about Magnetic field design in a cylindrical high-permeability shield: The combination of simple building blocks and a genetic algorithm.

Triaxial detection of the neuromagnetic field using optically-pumped magnetometry: feasibility and application in children (2022)
Journal Article
Boto, E., Shah, V., Hill, R. M., Rhodes, N., Osborne, J., Doyle, C., …Brookes, M. J. (2022). Triaxial detection of the neuromagnetic field using optically-pumped magnetometry: feasibility and application in children. NeuroImage, 252, Article 119027. https://doi.org/10.1016/j.neuroimage.2022.119027

Optically-pumped magnetometers (OPMs) are an established alternative to superconducting sensors for magnetoencephalography (MEG), offering significant advantages including flexibility to accommodate any head size, uniform coverage, free movement duri... Read More about Triaxial detection of the neuromagnetic field using optically-pumped magnetometry: feasibility and application in children.