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High-resolution cortical dipole layer imaging based on noise covariance matrix.

作者信息

Hori Junichi, Watanabe Satoru

机构信息

Department of Biocybernetics, Niigata University, Niigata 950-2181 Japan.

出版信息

Annu Int Conf IEEE Eng Med Biol Soc. 2009;2009:73-6. doi: 10.1109/IEMBS.2009.5334965.

DOI:10.1109/IEMBS.2009.5334965
PMID:19965117
Abstract

We have investigated the suitable spatial filters for inverse estimation of cortical dipole imaging from the scalp electroencephalogram. The effects of incorporating statistical information of noise into inverse procedures were examined by computer simulations and experimental studies. The parametric projection filter (PPF) was applied to an inhomogeneous three-sphere volume conductor head model. The noise covariance matrix was estimated by applying independent component analysis (ICA) to the scalp potentials. Moreover, the sampling method of the noise information was examined for calculating the noise covariance matrix. The simulation results suggest that the spatial resolution was improved while the effect of noise was suppressed by including the separated noise at the time instant of imaging and by adjusting the number of samples according to the signal to noise ratio.

摘要

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