The inverse EEG problem

The inverse EEG problem

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The inverse EEG problem
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    The inverse EEG problem

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    Format
    Paperback
    Language
    English
    Category
    Computers & Technology
    Condition
    New
    ISBN-13
    9783640185238
    ISBN-10
    3640185234

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    Product description

    ISBN: 3640185234

    Author: H

    Condition: New

    Bachelor Thesis from the year 2007 in the subject Computer Science - Miscellaneous, grade: 1.0, Free University of Berlin (Institute of Mathematics and Informatics, Department Bioinfomatics), language: English, abstract: Abstract: The inverse EEG problem is a well-studied, ill-posed problem in mathematics and neuroinformatics. Given a record of a limited number of electrodes (e.g. 21) that are placed on scalp, it is the task to estimate a three dimensional distribution of neural currents in the brain. The actual thesis deals with this problem and proposes a propabilistic Bayesian approach that assumes the distribution of neural currents to be heterogeneous - active and inactive regions in the brain are expected. This can be formalized with a mixture distribution. Furthermore, an expectation-maximization (EM) algorithm is presented that performs simultaneous classification and computation of neural currents, given an EEG measurement. Zusammenfassung: Diese Bachelorarbeit thematisiert das inverse EEG Problem. Dies ist ein umfangreich beschriebenes, schlecht gestelltes mathematisches Problem in der medizinischen Visualisierung. Bei einer EEG-Messung werden eine bestimmte Anzahl (z.B. 21) Elektroden an der Kopfhaut angebracht und elektrische Strme dort detektiert. Das hier beschriebene Problem besteht darin, aus dieser Messung eine dreidimensionales Verteilung neuronaler Gehirnstrme zu rekonstruieren. Es wird ein propabilistischer Bayesianischer Ansatz vorgestellt, um dieses Problem zu lsen. Dabei wird angenommen, dass die Verteilung neuronaler Strme heterogen ist - es gibt aktive und nicht-aktive Bereiche im Gehirn. Dies wird mathematisch mit einer Mischverteilung formalisiert. Dieser Ansatz ermglicht Gehirnstrme sowohl zu berechnen, also auch zu klassifizieren. Ein entsprechender EM Algorithmus, der dies simultan durchfhrt, wird vorgestellt.

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