Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
DIFFERENTIAL CHARACTERIZATION OF NEURAL SOURCES WITH THE BIMODAL TRUNCATED SVD PSEUDO-INVERSE FOR EEG AND MEG MEASUREMENTS
Autore:
GENCER NG; WILLIAMSON SJ;
Indirizzi:
MIDDLE E TECH UNIV,DEPT ELECT ENGN TR-06531 ANKARA TURKEY NYU,DEPT PHYS NEW YORK NY 10003
Titolo Testata:
IEEE transactions on biomedical engineering
fascicolo: 7, volume: 45, anno: 1998,
pagine: 827 - 838
SICI:
0018-9294(1998)45:7<827:DCONSW>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
LEAST-SQUARES ESTIMATION; MAGNETIC SOURCE IMAGES; SPHERICAL MODEL; RECONSTRUCTION; LOCALIZATION; DIPOLE; BRAIN;
Keywords:
ELECTROENCEPHALOGRAPHY (EEG); MAGNETIC SOURCE IMAGING; MAGNETOENCAPHALOGRAPHY (MEG); SINGULAR VALUE DECOMPOSITION (SVD); TRUNCATED SVD PSEUDO-INVERSION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
47
Recensione:
Indirizzi per estratti:
Citazione:
N.G. Gencer e S.J. Williamson, "DIFFERENTIAL CHARACTERIZATION OF NEURAL SOURCES WITH THE BIMODAL TRUNCATED SVD PSEUDO-INVERSE FOR EEG AND MEG MEASUREMENTS", IEEE transactions on biomedical engineering, 45(7), 1998, pp. 827-838

Abstract

A method for obtaining a practical inverse for the distribution of neural activity in the human cerebral cortex is developed for electric, magnetic, and bimodal data to exploit their complementary aspects. Intracellular current is represented by current dipoles uniformly distributed on two parallel sulci joined by a gyrus, Linear systems of equations relate electric, magnetic, and binodal data to unknown dipole moments. The corresponding lead-field matrices are characterized by singular value decomposition (SVD), The optimal reference electrode locationfor electric data is chosen on the basis of the decay behavior of thesingular values. The singular values of these matrices show better decay behavior with increasing number of measurements, however, that property is useful depending on the noise in the measurements. The truncated SVD pseudo-inverse is used to control noise artifacts in the reconstructed images, Simulations for single-dipole sources at different depths reveal the relative contributions of electric and magnetic measures. For realistic noise levels the performance of both unimodal and bimodal systems do not improve with an increase in the number of measurements beyond similar to 100. Bimodal image reconstructions are generally superior to unimodal ones in finding the center of activity.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 31/03/20 alle ore 03:57:28