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Titolo:
ERROR-BOUNDS FOR EEG AND MEG DIPOLE SOURCE LOCALIZATION
Autore:
MOSHER JC; SPENCER ME; LEAHY RM; LEWIS PS;
Indirizzi:
UNIV SO CALIF,INST SIGNAL & IMAGE PROC LOS ANGELES CA 90089 UNIV SO CALIF,INST SIGNAL & IMAGE PROC LOS ANGELES CA 90089 LOS ALAMOS NATL LAB LOS ALAMOS NM 87545 TRW CO INC REDONDO BEACH CA 90278
Titolo Testata:
Electroencephalography and clinical neurophysiology
fascicolo: 5, volume: 86, anno: 1993,
pagine: 303 - 321
SICI:
0013-4694(1993)86:5<303:EFEAMD>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
MAGNETOENCEPHALOGRAM; ELECTROENCEPHALOGRAM; POTENTIALS; MODELS; FIELDS; HEAD;
Keywords:
SPATIOTEMPORAL SOURCE MODELING; EEG; MEG; DIPOLE SOURCE LOCALIZATION ERROR; DIPOLE MOMENT ERROR;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
32
Recensione:
Indirizzi per estratti:
Citazione:
J.C. Mosher et al., "ERROR-BOUNDS FOR EEG AND MEG DIPOLE SOURCE LOCALIZATION", Electroencephalography and clinical neurophysiology, 86(5), 1993, pp. 303-321

Abstract

General formulas are presented for computing a lower bound on localization and moment error for electroencephalographic (EEG) or magnetoencephalographic (MEG) current source dipole models with arbitrary sensorarray geometry. Specific EEG and MEG formulas are presented for multiple dipoles in a head model with 4 spherical shells. Localization error bounds are presented for both EEG and MEG for several different sensor configurations. Graphical error contours are presented for 127 sensors covering the upper hemisphere, for both 37 sensors and 127 sensorscovering a smaller region, and for the standard 10-20 EEG sensor arrangement. Both 1- and 2-dipole cases were examined for all possible dipole orientations and locations within a head quadrant. The results show a strong dependence on absolute dipole location and orientation. Theresults also show that fusion of the EEG and MEG measurements into a combined model reduces the lower bound. A Monte Carlo simulation was performed to check the tightness of the bounds for a selected case. Thesimple head model, the low power noise and the few strong dipoles were all selected in this study as optimistic conditions to establish possibly fundamental resolution limits for any localization effort. Results, under these favorable assumptions, show comparable resolutions between the EEG and the MEG models, but accuracy for a single dipole, in either case, appears limited to several millimeters for a single time slice. The lower bounds increase markedly with just 2 dipoles. Observations are given to support the need for full spatiotemporal modeling to improve these lower bounds. All of the simulation results presented can easily be scaled to other instances of noise power and dipole intensity.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/04/20 alle ore 02:37:09