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Fourth order approaches for localization of brain current sources.

Abstract : Two high resolution methods solving inverse problems potentially ill-posed, named 4-MUSIC and 4-RapMUSIC, are proposed. They allow for localization of brain current sources with unconstrained orientations from surface electro-or magneto-encephalographic data using spherical or realistic head geometries. The 4-MUSIC and 4-RapMUSIC methods are based on i) the separability of the data transfer matrix as a function of location and orientation parameters and ii) the fourth order (FO) virtual array theory. In addition, 4-RapMUSIC uses the deflation concept extended to FO statistics accounting for the presence of potentially but not totally coherent sources. Computer results display the superiority of the 4-RapMUSIC approach in different situations (two closed sources, additive Gaussian noise with unknown spatial covariance, ...) especially over classical algorithms.
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Submitted on : Wednesday, October 31, 2007 - 6:25:06 PM
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Laurent Albera, Anne Ferreol, Delphine Cosandier-Rimele, Isabelle Merlet, Fabrice Wendling. Fourth order approaches for localization of brain current sources.. Conference proceedings : .. Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference, Institute of Electrical and Electronics Engineers (IEEE), 2006, 1, pp.4498-501. ⟨10.1109/IEMBS.2006.260063⟩. ⟨inserm-00183642⟩



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