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Yttrium-iron garnet magnetometer in MEG: Advance towards multi-channel arrays

Skidchenko, E.; Butorina, A.; Ostras, M.; Vetoshko, P.; Kuzmichev, A.; Yavich, N.; Malovichko, M.; Koshev, N.

2022-07-13 neuroscience
10.1101/2022.07.11.499607 bioRxiv
Show abstract

Recently, a new kind of sensor applicable in magnetoencephalography (MEG) has been presented: a solid-state yttrium-iron garnet magnetometer (YIGM). The feasibility of YIGM was proved in alpha-rhythm registration experiment. In the current paper, we propose the analysis of lead-field matrices for different possible YIGM multichannel on-scalp sensor layouts with respect to the information theory. We use real noise level of the new sensor to compute signal power, signal-to-noise ration (SNR) and total information capacity, and compare them with corresponding metrics that can be obtained with well-established MEG systems: based on superconducting quantum interference devices (SQUIDs) and optically-pumped magnetometers (OPMs). This simulation study is aimed to shed some light on the direction for further development of YIGM sensor, namely creation of multi-channel YIG-MEG.

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