MEG (Magnetoencephalography) multipolar modeling of distributed sources using RAP-MUSIC (Recursively Applied and Projected Multiple Signal Characterization)

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We describe the use of truncated multipolar expansions for producing dynamic images of cortical neural activation from measurements of the magnetoencephalogram. We use a signal-subspace method to find the locations of a set of multipolar sources, each of which represents a region of activity in the cerebral cortex. Our method builds up an estimate of the sources in a recursive manner, i.e. we first search for point current dipoles, then magnetic dipoles, and finally first order multipoles. The dynamic behavior of these sources is then computed using a linear fit to the spatiotemporal data. The final step in the procedure ... continued below

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5 p.

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Mosher, John C.; Baillet, Sylvain; Jerbi, Karim & Leahy, Richard M. January 1, 2001.

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We describe the use of truncated multipolar expansions for producing dynamic images of cortical neural activation from measurements of the magnetoencephalogram. We use a signal-subspace method to find the locations of a set of multipolar sources, each of which represents a region of activity in the cerebral cortex. Our method builds up an estimate of the sources in a recursive manner, i.e. we first search for point current dipoles, then magnetic dipoles, and finally first order multipoles. The dynamic behavior of these sources is then computed using a linear fit to the spatiotemporal data. The final step in the procedure is to map each of the multipolar sources into an equivalent distributed source on the cortical surface. The method is illustrated through an application to epileptic interictal MEG data.

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5 p.

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  • "Submitted to: 34th ASILOMAR Conference on Signals, Systems, and Computers, Pacific Grove, California."

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  • Report No.: LA-UR-01-0641
  • Report No.: LA-UR-01-641
  • Grant Number: none
  • Office of Scientific & Technical Information Report Number: 975130
  • Archival Resource Key: ark:/67531/metadc930467

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  • January 1, 2001

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  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 12, 2016, 6:03 p.m.

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Mosher, John C.; Baillet, Sylvain; Jerbi, Karim & Leahy, Richard M. MEG (Magnetoencephalography) multipolar modeling of distributed sources using RAP-MUSIC (Recursively Applied and Projected Multiple Signal Characterization), article, January 1, 2001; United States. (digital.library.unt.edu/ark:/67531/metadc930467/: accessed August 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.