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• W2949327983 endingPage "553" @default.
• W2949327983 startingPage "542" @default.
• W2949327983 abstract "Optically-pumped magnetometers (OPMs) have recently reached sensitivity levels required for magnetoencephalography (MEG). OPMs do not need cryogenics and can thus be placed within millimetres from the scalp into an array that adapts to the individual head size and shape, thereby reducing the distance from cortical sources to the sensors. Here, we quantified the improvement in recording MEG with hypothetical on-scalp OPM arrays compared to a 306-channel state-of-the-art SQUID array (102 magnetometers and 204 planar gradiometers). We simulated OPM arrays that measured either normal (nOPM; 102 sensors), tangential (tOPM; 204 sensors), or all components (aOPM; 306 sensors) of the magnetic field. We built forward models based on magnetic resonance images of 10 adult heads; we employed a three-compartment boundary element model and distributed current dipoles evenly across the cortical mantle. Compared to the SQUID magnetometers, nOPM and tOPM yielded 7.5 and 5.3 times higher signal power, while the correlations between the field patterns of source dipoles were reduced by factors of 2.8 and 3.6, respectively. Values of the field-pattern correlations were similar across nOPM, tOPM and SQUID gradiometers. Volume currents reduced the signals of primary currents on average by 10%, 72% and 15% in nOPM, tOPM and SQUID magnetometers, respectively. The information capacities of the OPM arrays were clearly higher than that of the SQUID array. The dipole-localization accuracies of the arrays were similar while the minimum-norm-based point-spread functions were on average 2.4 and 2.5 times more spread for the SQUID array compared to nOPM and tOPM arrays, respectively." @default.
• W2949327983 created "2019-06-27" @default.
• W2949327983 creator A5003680020 @default.
• W2949327983 creator A5044017880 @default.
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• W2949327983 date "2017-02-01" @default.
• W2949327983 modified "2023-10-12" @default.
• W2949327983 title "Measuring MEG closer to the brain: Performance of on-scalp sensor arrays" @default.
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• W2949327983 doi "https://doi.org/10.1016/j.neuroimage.2016.12.048" @default.
• W2949327983 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5432137" @default.
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• W2949327983 hasPublicationYear "2017" @default.
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