Spatial sampling of MEG and EEG based on generalized spatial-frequency analysis and optimal design

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2021-12-15
Major/Subject
Mcode
Degree programme
Language
en
Pages
15
1-15
Series
NeuroImage, Volume 245
Abstract
In this paper, we analyze spatial sampling of electro- (EEG) and magnetoencephalography (MEG), where the electric or magnetic field is typically sampled on a curved surface such as the scalp. By simulating fields originating from a representative adult-male head, we study the spatial-frequency content in EEG as well as in on- and off-scalp MEG. This analysis suggests that on-scalp MEG, off-scalp MEG and EEG can benefit from up to 280, 90 and 110 spatial samples, respectively. In addition, we suggest a new approach to obtain sensor locations that are optimal with respect to prior assumptions. The approach also allows to control, e.g., the uniformity of the sensor locations. Based on our simulations, we argue that for a low number of spatial samples, model-informed non-uniform sampling can be beneficial. For a large number of samples, uniform sampling grids yield nearly the same total information as the model-informed grids.
Description
| openaire: EC/H2020/686865/EU//BREAKBEN | openaire: EC/H2020/678578/EU//HRMEG Funding Information: This work has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No 686865 (project BREAKBEN), the European Research Council under grant agreement No 678578 (project HRMEG), the National Institute of Neurological Disorders and Stroke of the National Institutes of Health under Award Number R01NS094604, the Finnish Cultural Foundation under grant Nos. 00170330 and 00180388 (JI), and Vilho, Yrjö and Kalle Väisälä Foundation (AM). The content is solely the responsibility of the authors and does not necessarily represent the official views of the funding organizations. Publisher Copyright: © 2021
Keywords
Electroencephalography, Magnetoencephalography, On-scalp MEG, Optimal design, Spatial frequency, Spatial sampling
Other note
Citation
Iivanainen, J, Mäkinen, A J, Zetter, R, Stenroos, M, Ilmoniemi, R J & Parkkonen, L 2021, ' Spatial sampling of MEG and EEG based on generalized spatial-frequency analysis and optimal design ', NeuroImage, vol. 245, 118747, pp. 1-15 . https://doi.org/10.1016/j.neuroimage.2021.118747