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Titolo:
Spatial filter approach for comparison of the forward and inverse problemsof electroencephalography and magnetoencephalography
Autore:
Bradshaw, LA; Wijesinghe, RS; Wikswo, JP;
Indirizzi:
Vanderbilt Univ, Dept Phys & Astron, Living State Phys Grp, Nashville, TN 37235 USA Vanderbilt Univ Nashville TN USA 37235 Phys Grp, Nashville, TN 37235 USA Tulane Univ, Dept Biomed Engn, Brain Phys Grp, New Orleans, LA 70118 USA Tulane Univ New Orleans LA USA 70118 Phys Grp, New Orleans, LA 70118 USA Lipscomb Univ, Dept Phys & Engn Sci, Nashville, TN USA Lipscomb Univ Nashville TN USA , Dept Phys & Engn Sci, Nashville, TN USA
Titolo Testata:
ANNALS OF BIOMEDICAL ENGINEERING
fascicolo: 3, volume: 29, anno: 2001,
pagine: 214 - 226
SICI:
0090-6964(200103)29:3<214:SFAFCO>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Soggetto:
EEG LOCALIZATION TEST; MAGNETIC-FIELD; HUMAN-BRAIN; MEG MEASUREMENTS; MODEL; RESOLUTION; MAGNETOMETER; LAPLACIAN; SURFACE; MUSCLE;
Keywords:
magnetoencephalogram; electroencephalogram; inverse problem; spatial resolution; biomagnetism;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
56
Recensione:
Indirizzi per estratti:
Indirizzo: Bradshaw, LA Vanderbilt Univ, Dept Phys, Box 1807,Stn B, Nashville, TN 37235 USA Vanderbilt Univ Box 1807,Stn B Nashville TN USA 37235 235 USA
Citazione:
L.A. Bradshaw et al., "Spatial filter approach for comparison of the forward and inverse problemsof electroencephalography and magnetoencephalography", ANN BIOMED, 29(3), 2001, pp. 214-226

Abstract

We present an analysis of the relative information content of cortical current source reconstructions from electroencephalogram (EEG) and magnetoencephalogram (MEG) forward calculations by examining the spatial filters that relate the internal sources with the externally measured electric potentials and magnetic fields. The forward spatial filters are seen to be low-pass functions of spatial frequency and spatial resolution degrades in external measurements. Inverse spatial filters may be used to reconstruct cortical sources from external data, but since they are high-pass functions of spatial frequency, they must be regularized to avoid instabilities caused by noise at higher spatial frequencies. The regularization process limits the spatial resolution of source reconstructions. EEG forward spa tial filters falloff at lower spatial frequencies than MEG filters; hence, there is less information available in higher spatial frequencies resulting in lower spatial resolution in inverse reconstructions. The tangential component of the magnetic field provides even higher spatial resolution than can be obtained using the radial component. An accompanying article examines the surface Laplacian for both the EEG and the MEG. (C) 2001 Biomedical Engineering Society.

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Documento generato il 04/04/20 alle ore 02:21:50