On the EEG/MEG forward problem solution for distributed cortical sources.
In studies of EEG/MEG problems involving cortical sources, the cortex may be modeled by a 2-D manifold inside the brain. In such cases the primary or impressed current density over this manifold is usually approximated by a set of dipolar sources located at the vertices of the cortical surface tesse...
| Publicado en: | Medical & Biological Engineering & Computing Vol. 47; no. 10; pp. 1083 - 1092 |
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| Autores principales: | , , , , , |
| Formato: | research Journal Article |
| Publicado: |
Springer Nature
Oct2009
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=104907536&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 104907536 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 01400118 PO0 jtl: Medical & Biological Engineering & Computing issn: 01400118 maglogo: N pubinfo: dt: Oct2009 vid: 47 iid: 10 pid: 237 pub: Springer Nature place: New York, New York artinfo: ui: 104907536 NLM19730912 2010448313 10.1007/s11517-009-0529-x NLM19730912 104907536 ppf: 1083 ppct: 9 formats: fmt: @attributes: type: P tig: atl: On the EEG/MEG forward problem solution for distributed cortical sources. aug: au: von Ellenrieder N Valdés-Hernández PA Muravchik CH von Ellenrieder, Nicolás Valdés-Hernández, Pedro A Muravchik, Carlos H affil: LEICI, Facultad de Ingenieria, Universidad Nacional de LaPlata, B1900TAG La Plata, Argentina sug: subj: Brain Diagnosis, Neurologic Electroencephalography Diagnostic Imaging Magnetics ab: In studies of EEG/MEG problems involving cortical sources, the cortex may be modeled by a 2-D manifold inside the brain. In such cases the primary or impressed current density over this manifold is usually approximated by a set of dipolar sources located at the vertices of the cortical surface tessellation. In this study, we analyze the different errors induced by this approximation on the EEG/MEG forward problem. Our results show that in order to obtain more accurate solutions of the forward problems with the multiple dipoles approximation, the moments of the dipoles should be weighted by the area of the surrounding triangles, or using an alternative approximation of the primary current as a constant or linearly varying current density over plane triangular elements of the cortical surface tessellation. This should be taken into account when computing the lead field matrix for solving the EEG/MEG inverse problem in brain imaging methods. pubtype: Academic Journal doctype: research Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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