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Titolo:
Experimental tests of EEG source localization accuracy in spherical head models
Autore:
Cuffin, BN; Schomer, DL; Ives, JR; Blume, H;
Indirizzi:
Beth Israel Deaconess Med Ctr, Boston, MA 02215 USA Beth Israel Deaconess Med Ctr Boston MA USA 02215 r, Boston, MA 02215 USA Harvard Univ, Sch Med, Boston, MA 02215 USA Harvard Univ Boston MA USA 02215 vard Univ, Sch Med, Boston, MA 02215 USA
Titolo Testata:
CLINICAL NEUROPHYSIOLOGY
fascicolo: 1, volume: 112, anno: 2001,
pagine: 46 - 51
SICI:
1388-2457(200101)112:1<46:ETOESL>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
IMPLANTED SOURCES; HUMAN BRAIN;
Keywords:
EEG; source localization; depth electrodes; inverse solutions; spherical head model; dipoles;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
8
Recensione:
Indirizzi per estratti:
Indirizzo: Cuffin, BN Beth Israel Deaconess Med Ctr, 330 Brookline Ave,GZ-522, Boston, MA 02215 USA Beth Israel Deaconess Med Ctr 330 Brookline Ave,GZ-522 Boston MA USA 02215
Citazione:
B.N. Cuffin et al., "Experimental tests of EEG source localization accuracy in spherical head models", CLIN NEU, 112(1), 2001, pp. 46-51

Abstract

Objectives: The locations of electrical sources in the brain can be calculated using EEG data. However, the accuracy of these calculations is not well known because it is usually not possible to compare calculated source locations with actual locations since little accurate location information is available about most sources in the brain. Methods: In this study, sources at known locations are created by injecting current into electrodes implanted in the brains of human subjects. The locations of the implanted and scalp EEG electrodes are determined from CTs. The EEG signals produced by these dipolar sources are used to calculate source locations in spherical head models containing brain, skull, and scalp layers. The brain and scalp layers have the same electrical conductivity while 3 different skull conductivity ratios of 1/80th, 1/40th, and 1/20th of brain and scalp conductivity are used. Localization errors have been determined for 177 sources in 13 subjects. Results: An average localization error of 10.6 (SD = 5.5) mm for all 177 source was obtained for a skull conductivity ratio of 1/40. The average errors for the other ratios an only a few millimeters larger. The average localization error for 108 sources at superior locations in the brain is 9.2 (4.3) mm. The average error for 69 inferior location sources is 12.8 (6.2) mm. There are no significant differences in localization accuracy for deep andsuperficial sources. Conclusions: These results indicate that the best average localization that can be achieved using a spherical head model is approximately 10 mm. Morerealistic head models will be required for greater localization accuracy. (C) 2001 Elsevier Science Ireland Ltd. All rights reserved.

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Documento generato il 08/04/20 alle ore 10:02:06