Results 21 to 30 of about 90,554 (217)

Improved spatio-temporal measurements of visually evoked fields using optically-pumped magnetometers [PDF]

Scientific Reports, 2021
Recent developments in performance and practicality of optically-pumped magnetometers (OPMs) have enabled new capabilities in non-invasive brain function mapping through magnetoencephalography.
Aikaterini Gialopsou, Christopher Abel, T. M. James, Thomas Coussens, Mark G. Bason, Reuben Puddy, Francesco Di Lorenzo, Katharina Rolfs, Jens Voigt, Tilmann Sander, Mara Cercignani, Peter Krüger   +11 more
doaj   +2 more sources

Cross-Axis projection error in optically pumped magnetometers and its implication for magnetoencephalography systems [PDF]

NeuroImage, 2022
Optically pumped magnetometers (OPMs) developed for magnetoencephalography (MEG) typically operate in the spin-exchange-relaxation-free (SERF) regime and measure a magnetic field component perpendicular to the propagation axis of the optical-pumping ...
Amir Borna, Joonas Iivanainen, Tony R. Carter, Jim McKay, Samu Taulu, Julia Stephen, Peter D.D. Schwindt   +6 more
doaj   +2 more sources

High Sample Rate Optically Pumped Helium Magnetometer [PDF]

Journal of Optoelectronical Nanostructures, 2019
Optically pumped helium magnetometers are important instruments whichhave many applications in military, mass spectroscopy and space applications. In thispaper, the working principles of helium magnetometers have been explained.
Abdorreza Asrar, Mojtaba Servatkhah, Mohammad Javad Salehi   +2 more
doaj   +1 more source

Fetal magnetoencephalography based on optically pumped magnetometers

bioRxiv
AbstractThe fetus in the third trimester of gestation has already the remarkable capacity to process external sensory information in utero. So far, investigations of fetal brain responses to sensory information have mostly relied on cryogenic magnetoencephalography (MEG), which is suitable to record fetal brain activity and is not much affected by ...
Pierre Corvilain, Chiara Capparini, Vincent Wens, Lauréline Fourdin, Maxime Ferez, Odile Feys, Anne Delbaere, Rosine Lejeune, Deborah Goldman, Caroline De Coninck, Xavier De Tiège, Julie Bertels   +11 more
openaire   +2 more sources

A novel, robust, and portable platform for magnetoencephalography using optically-pumped magnetometers. [PDF]

Imaging Neurosci (Camb)
Magnetoencephalography (MEG) measures brain function via assessment of magnetic fields generated by neural currents. Conventional MEG uses superconducting sensors, which place significant limitations on performance, practicality, and deployment; however,
Schofield H, Hill RM, Feys O, Holmes N, Osborne J, Doyle C, Bobela D, Corvilain P, Wens V, Rier L, Bowtell R, Ferez M, Mullinger KJ, Coleman S, Rhodes N, Rea M, Tanner Z, Boto E, de Tiège X, Shah V, Brookes MJ.   +20 more
europepmc   +4 more sources

Pushing the boundaries of MEG based on optically pumped magnetometers towards early human life. [PDF]

Imaging Neurosci (Camb)
Characterizing the early development of the human brain is critical from both fundamental and clinical perspectives. However, existing neuroimaging techniques are either not well suited to infants or have limited spatial or temporal resolution.
Corvilain P, Wens V, Bourguignon M, Capparini C, Fourdin L, Ferez M, Feys O, De Tiège X, Bertels J.   +8 more
europepmc   +2 more sources

Floquet description of optically pumped magnetometers [PDF]

Physical Review A, 2021
We present theoretical description of Voigt and Faraday effect based optically pumped magnetometers using the Floquet expansion. Our analysis describes the spin-operator dynamics of the first, $\hat{F}(t)$, and second, $\hat{F}^2(t)$, order moments and takes into account of different pumping profiles and decoherence effects.
Hans Marin Florez, Tadas Pyragius
openaire   +2 more sources

A 90-channel triaxial magnetoencephalography system using optically pumped magnetometers. [PDF]

Ann N Y Acad Sci, 2022
Magnetoencephalography (MEG) measures the small magnetic fields generated by current flow in neural networks, providing a noninvasive metric of brain function. MEG is well established as a powerful neuroscientific and clinical tool.
Rea M, Boto E, Holmes N, Hill R, Osborne J, Rhodes N, Leggett J, Rier L, Bowtell R, Shah V, Brookes MJ.   +10 more
europepmc   +2 more sources

Helium Optically Pumped Magnetometers Can Detect Epileptic Abnormalities as Well as SQUIDs as Shown by Intracerebral Recordings. [PDF]

eNeuro, 2023
SQUID-based magnetoencephalography has been shown to improve the diagnosis and surgical treatment decision for presurgical evaluation of drug-resistant epilepsy.
Badier JM, Schwartz D, Bénar CG, Kanzari K, Daligault S, Romain R, Mitryukovskiy S, Fourcault W, Josselin V, Le Prado M, Jung J, Palacios-Laloy A, Romain C, Bartolomei F, Labyt E, Bonini F.   +15 more
europepmc   +2 more sources

Noninvasive Magnetic-Marking-Based Flow Metering with Optically Pumped Magnetometers

Applied Sciences, 2022
We present a noninvasive procedure that measures the flow velocity of a fluid by using polarized hydrogen nuclei in the fluid. The measurement procedure is based on a time-of-flight method where magnetic information is applied on the fluid with a ...
Leonhard Schmieder, Peter A. Koss, Armin Lambrecht, Frank Kühnemann   +3 more
doaj   +1 more source