Results 11 to 20 of about 90,554 (217)

A customized bed based stand alone array of optically pumped magnetometers for fetal magnetocardiography measurements [PDF]

Scientific Reports
Fetal magnetocardiography (fMCG) is a non-invasive technique that measures the magnetic fields associated with fetal heart electrical activity outside of the maternal abdomen.
Diana Escalona-Vargas, Alberto Ramirez, Eric R. Siegel, Elijah H. Bolin, Hari Eswaran   +4 more
doaj   +3 more sources

Non-invasive measurements of ictal and interictal epileptiform activity using optically pumped magnetometers [PDF]

Scientific Reports, 2023
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 (SNR)
Arjan Hillebrand, Niall Holmes, Ndedi Sijsma, George C. O’Neill, Tim M. Tierney, Niels Liberton, Anine H. Stam, Nicole van Klink, Cornelis J. Stam, Richard Bowtell, Matthew J. Brookes, Gareth R. Barnes   +11 more
doaj   +3 more sources

Distributed network of optically pumped magnetometers for space weather monitoring [PDF]

Scientific Reports
Spatial variation in the intensity of magnetospheric and ionospheric fluctuations during solar storms creates ground-induced currents, of importance in both infrastructure engineering and geophysical science.
Marcin S. Mrozowski, Angus S. Bell, Paul F. Griffin, Dominic Hunter, David Burt, James P. McGilligan, Erling Riis, Ciarán D. Beggan, Stuart J. Ingleby   +8 more
doaj   +3 more sources

Feasibility of magnetomyography with optically pumped magnetometers in a mobile magnetic shield [PDF]

Scientific Reports
While magnetomyography (MMG) using optically pumped magnetometers (OPMs) is a promising method for non-invasive investigation of the neuromuscular system, it has almost exclusively been performed in magnetically shielded rooms (MSRs) to date.
Simon Nordenström, Victor Lebedev, Stefan Hartwig, Marlen Kruse, Justus Marquetand, Philip Broser, Thomas Middelmann   +6 more
doaj   +3 more sources

Using optically pumped magnetometers to replicate task-related responses in next generation magnetoencephalography [PDF]

Scientific Reports
Optically pumped magnetometers (OPMs) offer a new wearable means to measure magnetoencephalography (MEG) signals, with many advantages compared to conventional systems.
Kristina Safar, Marlee M. Vandewouw, Julie Sato, Jasen Devasagayam, Ryan M. Hill, Molly Rea, Matthew J. Brookes, Margot J. Taylor   +7 more
doaj   +3 more sources

Simplified shielded MEG-MRI multimodal system with scalar-mode optically pumped magnetometers as MEG sensors [PDF]

Scientific Reports
Magnetoencephalography (MEG) conventionally operates within high-performance magnetic shields due to the extremely weak magnetic field signals from the measured objects and the narrow dynamic range of the magnetic sensors employed for detection.
Yosuke Ito, Hiroyuki Ueda, Takenori Oida, Takahiro Moriya, Akinori Saito, Motohiro Suyama   +5 more
doaj   +3 more sources

Facial magnetomyography using an array of optically pumped magnetometers. [PDF]

Clin Neurophysiol Pract
Measuring facial muscle activity is crucial in the diagnosis of facial palsy. This study investigated whether contactless Magnetomyography (MMG) using optically pumped magnetometers (OPM) is feasible for visualizing facial muscle activity.An anatomically shaped mask featuring eleven OPM was arranged on one side of the face of five healthy subjects. MMG
von Fraunberg J, Lu H, Yang H, Marquetand N, Braun C, Rüttiger L, Wolpert S, Knipper M, Siegel M, Löwenheim H, Marquetand J.   +10 more
europepmc   +4 more sources

Quantitative 2D Magnetorelaxometry Imaging of Magnetic Nanoparticles Using Optically Pumped Magnetometers [PDF]

Sensors, 2020
For biomagnetical applications exploiting physical properties of magnetic nanoparticles (MNP), e.g., magnetic hyperthermia, knowledge about the quantitative spatial MNP distribution is crucial, which can be extracted by magnetorelaxometry (MRX) imaging ...
Aaron Jaufenthaler, Peter Schier, Thomas Middelmann, Maik Liebl, Frank Wiekhorst, Daniel Baumgarten   +5 more
doaj   +2 more sources

Detection of the 40 Hz auditory steady-state response with optically pumped magnetometers [PDF]

Scientific Reports, 2022
Magnetoencephalography (MEG) is a functional neuroimaging technique that noninvasively detects the brain magnetic field from neuronal activations. Conventional MEG measures brain signals using superconducting quantum interference devices (SQUIDs).
Kyung-min An, Jeong Hyun Shim, Hyukchan Kwon, Yong-Ho Lee, Kwon-Kyu Yu, Moonyoung Kwon, Woo Young Chun, Tetsu Hirosawa, Chiaki Hasegawa, Sumie Iwasaki, Mitsuru Kikuchi, Kiwoong Kim   +11 more
doaj   +2 more sources

Contactless measurements of retinal activity using optically pumped magnetometers

NeuroImage, 2021
Optically pumped magnetometers (OPMs) have been adopted for the measurement of brain activity. Without the need to be cooled to cryogenic temperatures, an array of these sensors can be placed more flexibly, which allows for the recording of neuronal ...
Britta U. Westner, James I. Lubell, Mads Jensen, Sigbjørn Hokland, Sarang S. Dalal   +4 more
doaj   +5 more sources