Comput Methods Programs Biomed - General bounds for electrode mislocation on the EEG inverse problem.

Tópicos

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Resumo

We analyze the effect of electrode mislocation on the electroencephalography (EEG) inverse problem using the Cram?r-Rao bound (CRB) for single dipolar source parameters. We adopt a realistic head shape model, and solve the forward problem using the Boundary Element Method; the use of the CRB allows us to obtain general results which do not depend on the algorithm used for solving the inverse problem. We consider two possible causes for the electrode mislocation, errors in the measurement of the electrode positions and an imperfect registration between the electrodes and the scalp surfaces. For 120 electrodes placed in the scalp according to the 10-20 standard, and errors on the electrode location with a standard deviation of 5mm, the lower bound on the standard deviation in the source depth estimation is approximately 1mm in the worst case. Therefore, we conclude that errors in the electrode location may be tolerated since their effect on the EEG inverse problem are negligible from a practical point of view.

Resumo Limpo

analyz effect electrod misloc electroencephalographi eeg invers problem use cramrrao bound crb singl dipolar sourc paramet adopt realist head shape model solv forward problem use boundari element method use crb allow us obtain general result depend algorithm use solv invers problem consid two possibl caus electrod misloc error measur electrod posit imperfect registr electrod scalp surfac electrod place scalp accord standard error electrod locat standard deviat mm lower bound standard deviat sourc depth estim approxim mm worst case therefor conclud error electrod locat may toler sinc effect eeg invers problem neglig practic point view

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