Title :
Should you trust your DSL results?
Author :
Zhang, Zhi ; Jewett, Don L.
Author_Institution :
Abratech Corp., Sausalito, CA, USA
Abstract :
When fitting simultaneously-active dipoles, currently-used DSL (Dipole Source Localization) methods may contain MulGenErrs (Multiple-Generator Errors) due to model misspecification. The size of the MulGenErr is a function of both the model used, and the dipole parameters, including the dipoles´ waveforms (time-varying magnitudes). For a given fitting model, by examining the variation of the MulGenErrs (or the fit parameters) under different waveforms for the same generating-dipoles, the accuracy of the fitting model for this set of dipoles can be determined. This method of testing model misspecification can be applied to evoked potential maps where the parameters of the generating-dipoles are unknown. The dipole parameters fitted in a model should only be accepted if the model can be shown to be sufficiently accurate
Keywords :
brain models; electroencephalography; dipole source localization methods; dipole waveforms; fit parameters; model misspecification; multiple-generator errors; simultaneously-active dipoles; Conductivity; DSL; Humans; Least squares methods; Magnetic heads; Predictive models; Scalp; Surface fitting; Testing;
Conference_Titel :
Engineering in Medicine and Biology Society, 1994. Engineering Advances: New Opportunities for Biomedical Engineers. Proceedings of the 16th Annual International Conference of the IEEE
Conference_Location :
Baltimore, MD
Print_ISBN :
0-7803-2050-6
DOI :
10.1109/IEMBS.1994.411808
