Spatial sampling of MEG and EEG based on generalized spatial-frequency analysis and optimal design.
Spatial sampling of MEG and EEG based on generalized spatial-frequency analysis and optimal design.
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DOI:
10.1016/j.neuroimage.2021.118747
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发表时间:
2021-12-15
期刊:
影响因子:
5.7
通讯作者:
Parkkonen L
中科院分区:
文献类型:
--
作者:
Iivanainen J;Mäkinen AJ;Zetter R;Stenroos M;Ilmoniemi RJ;Parkkonen L
We analyze spatial sampling of MEG and EEG using a realistic head model. On-scalp MEG may benefit from three times more samples than EEG and off-scalp MEG. We optimize sample positions to convey the most information from the brain. Optimized sampling can be useful when the sensor number is limited. The sample positions can be optimized to target a region of interest in the brain. 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.
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通讯作者:
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影响因子:
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影响因子:
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通讯作者:
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