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Titolo:
SPLINE LAPLACIAN ESTIMATE OF EEG POTENTIALS OVER A REALISTIC MAGNETICRESONANCE-CONSTRUCTED SCALP SURFACE MODEL
Autore:
BABILONI F; BABILONI C; CARDUCCI F; FATTORINI L; ONORATI P; URBANO A;
Indirizzi:
UNIV ROMA LA SAPIENZA,INST HUMAN PHYSIOL,DIV HIGH RESOLUT EEG,PLE A MORO 5 I-00185 ROME ITALY
Titolo Testata:
Electroencephalography and clinical neurophysiology
fascicolo: 4, volume: 98, anno: 1996,
pagine: 363 - 373
SICI:
0013-4694(1996)98:4<363:SLEOEP>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
MOVEMENT-RELATED POTENTIALS; HUMAN HEAD; INTERPOLATION; CORTEX;
Keywords:
HIGH RESOLUTION EEG; MR-CONSTRUCTED SCALP SURFACE MODEL; REALISTIC SPLINE LAPLACIAN; SIMULATED EEG POTENTIALS; SCALP-RECORDED EVENT-RELATED POTENTIALS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
43
Recensione:
Indirizzi per estratti:
Citazione:
F. Babiloni et al., "SPLINE LAPLACIAN ESTIMATE OF EEG POTENTIALS OVER A REALISTIC MAGNETICRESONANCE-CONSTRUCTED SCALP SURFACE MODEL", Electroencephalography and clinical neurophysiology, 98(4), 1996, pp. 363-373

Abstract

This paper presents a realistic Laplacian (RL) estimator based on a tensorial formulation of the surface Laplacian (SL) that uses the 2-D thin plate spline function to obtain a mathematical description of a realistic scalp surface. Because of this tensorial formulation, the RL does not need an orthogonal reference frame placed on the realistic scalp surface. In simulation experiments the RL was estimated with an increasing number of ''electrodes'' (up to 256) on a mathematical scalp model, the analytic Laplacian being used as a reference. Second and third order spherical spline Laplacian estimates were examined for comparison. Noise of increasing magnitude and spatial frequency was added tothe simulated potential distributions. Movement-related potentials and somatosensory evoked potentials sampled with 128 electrodes were used to estimate the RL on a realistically shaped, MR-constructed model of the subject's scalp surface. The RL was also estimated on a mathematical spherical scalp model computed from the real scalp surface. Simulation experiments showed that the performances of the RL estimator were similar to those of the second and third order spherical spline Laplacians. Furthermore, the information content of scalp-recorded potentials was clearly better when the RL estimator computed the SL of the potential on an MR-constructed scalp surface model.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 08/07/20 alle ore 06:22:29