| On the EEG/MEG forward problem solution for distributed cortical sources. | |
| | |
MedLine Citation:
|
PMID: 19730912 Owner: NLM Status: In-Process |
Abstract/OtherAbstract:
|
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. |
| | |
Authors:
|
Nicolás von Ellenrieder; Pedro A Valdés-Hernández; Carlos H Muravchik |
Publication Detail:
|
Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
|
Title: Medical & biological engineering & computing Volume: 47 ISSN: 1741-0444 ISO Abbreviation: Med Biol Eng Comput Publication Date: 2009 Oct |
Date Detail:
|
Created Date: 2009-10-21 Completed Date: - Revised Date: - |
Medline Journal Info:
|
Nlm Unique ID: 7704869 Medline TA: Med Biol Eng Comput Country: United States |
Other Details:
|
Languages: eng Pagination: 1083-91 Citation Subset: IM |
Affiliation:
|
LEICI, Facultad de Ingenieria, Universidad Nacional de LaPlata, B1900TAG La Plata, Argentina. nellen@ieee.org |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
|
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Establishment of a constructed wetland in extreme dryland.
Next Document: Identification of task parameters from movement-related cortical potentials.