What question did this study set out to answer?

To evaluate the performance gains of on-scalp optically-pumped magnetometer (OPM) arrays relative to a conventional 306-channel SQUID MEG system across various sensor orientations.

December 19, 2016NeuroImageOpen Access

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

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To evaluate the performance gains of on-scalp optically-pumped magnetometer (OPM) arrays relative to a conventional 306-channel SQUID MEG system across various sensor orientations.
Simulated on-scalp OPM arrays measuring normal (nOPM; 102 sensors), tangential (tOPM; 204 sensors), or all magnetic field components (aOPM; 306 sensors) against a 306-channel SQUID system.
Generated forward models using three-compartment boundary element models and cortical current dipoles based on structural MRIs from 10 adult heads (N=10).
Compared to SQUID magnetometers, nOPM and tOPM arrays yielded 7.5- and 5.3-fold higher signal power, while dipole field-pattern correlations decreased by factors of 2.8 and 3.6, respectively.
Volume currents attenuated primary current signals by an average of 10% in nOPM, 72% in tOPM, and 15% in SQUID magnetometers.
Minimum-norm point-spread functions showed 2.4 and 2.5 times greater spatial spread for SQUIDs compared to nOPM and tOPM arrays, respectively, despite similar dipole-localization accuracies.

Authors

JIJoonas IivanainenAalto University MSMatti StenroosAalto University LPLauri ParkkonenAalto University

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Implication

Computational simulation reveals superior signal power and resolution for on-scalp magnetometers over conventional SQUID systems in adult head models, highlighting enhanced functional brain imaging.

Cite This Study

Iivanainen et al. (2016) studied this question.

synapsesocial.com/papers/69ff479db124fe5819855aa7 https://doi.org/10.1016/j.neuroimage.2016.12.048

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Implication

Computational simulation reveals superior signal power and resolution for on-scalp magnetometers over conventional SQUID systems in adult head models, highlighting enhanced functional brain imaging.

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

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Discussion

Implication

Cite This Study

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

Key Points

Discussion

Implication

Cite This Study

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