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Titolo: DIFFERENTIAL CHARACTERIZATION OF NEURAL SOURCES WITH THE BIMODAL TRUNCATED SVD PSEUDOINVERSE FOR EEG AND MEG MEASUREMENTS
Autore: GENCER NG; WILLIAMSON SJ;
 Indirizzi:
 MIDDLE E TECH UNIV,DEPT ELECT ENGN TR06531 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:
 00189294(1998)45:7<827:DCONSW>2.0.ZU;2F
 Fonte:
 ISI
 Lingua:
 ENG
 Soggetto:
 LEASTSQUARES ESTIMATION; MAGNETIC SOURCE IMAGES; SPHERICAL MODEL; RECONSTRUCTION; LOCALIZATION; DIPOLE; BRAIN;
 Keywords:
 ELECTROENCEPHALOGRAPHY (EEG); MAGNETIC SOURCE IMAGING; MAGNETOENCAPHALOGRAPHY (MEG); SINGULAR VALUE DECOMPOSITION (SVD); TRUNCATED SVD PSEUDOINVERSION;
 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 PSEUDOINVERSE FOR EEG AND MEG MEASUREMENTS", IEEE transactions on biomedical engineering, 45(7), 1998, pp. 827838
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 leadfield 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 pseudoinverse is used to control noise artifacts in the reconstructed images, Simulations for singledipole 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