Accuracy of Multiple Equivalent Current Dipole Source Localization from EEG in Terms of Confidence Limits for Radial Distances

This study describes a simplified confidence limit only for the radial distance of estimated multiple equivalentcurrent dipoles (ECDs), by which the localization accuracy is quantitatively evaluated. By applying multiple ECD localization to three kinds of actual visual event-related potentials (ERPs...

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Published inIYO DENSHI TO SEITAI KOGAKU Vol. 37; no. 4; pp. 336 - 341
Main Authors YAMAZAKI, Toshimasa, KAMIJO, Ken-ichi, KENMOCHI, Akihisa
Format Journal Article
LanguageJapanese
Published Japanese Society for Medical and Biological Engineering 1999
Subjects
Bioelectric potentials
Biomedical engineering
Electric currents
Magnetic moments
Numerical methods
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Summary:This study describes a simplified confidence limit only for the radial distance of estimated multiple equivalentcurrent dipoles (ECDs), by which the localization accuracy is quantitatively evaluated. By applying multiple ECD localization to three kinds of actual visual event-related potentials (ERPs), this measure was compared with normalized root mean square (nRMS), and its dependence on dipole position and moment was investigated. The present results show that the confidence limit depends on the radial distance of the dipoles, that the confidence limit is a localization accuracy measure conceptually different from the nRMS and that larger dipole moment yields misleadingly higher accuracy, independently of the number of ECDs.
Bibliography:ObjectType-Article-2
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ISSN:0021-3292
2185-5498
DOI:10.11239/jsmbe1963.37.336