| Influence of tissue conductivity changes on the EEG signal in the human brain - A simulation study. | |
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MedLine Citation:
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PMID: 20888205 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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Tissue disorders due to brain pathologies, like tumors, ischemia, or vasogenic edema, are known to impact the propagation of electrical fields. By using the finite element method the EEG forward problem was solved within an adapted subspace of a simplified human head model. Simulated electric potentials on the scalp revealed strong influences on the magnitude of the signal in almost all cases, even for ischemic tissue in which conductivity is lower than in healthy tissue. Remarkably, due to the "shunting effect" and the diminishing anisotropy of tissue conductivity, the signal amplitude of a radial dipole located in a sulcus was found to be higher than the signal of a dipolar source on a gyrus if the ischemic area was located underneath. The results demonstrate that pathological tissue changes have to be taken into account when evaluating EEG signals, especially when performing source localization. |
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Authors:
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Thomas Jochmann; Daniel Güllmar; Jens Haueisen; Jürgen R Reichenbach |
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Publication Detail:
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Type: Journal Article Date: 2010-10-02 |
Journal Detail:
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Title: Zeitschrift für medizinische Physik Volume: 21 ISSN: 1876-4436 ISO Abbreviation: Z Med Phys Publication Date: 2011 May |
Date Detail:
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Created Date: 2011-06-20 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 100886455 Medline TA: Z Med Phys Country: Germany |
Other Details:
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Languages: eng Pagination: 102-12 Citation Subset: IM |
Copyright Information:
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Copyright © 2010. Published by Elsevier GmbH. |
Affiliation:
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Medical Physics Group, Department of Diagnostic and Interventional Radiology, Jena University Hospital, Jena, Germany; Institute of Biomedical Engineering and Informatics, Ilmenau University of Technology, Ilmenau, Germany. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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