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Communication Dans Un Congrès Année : 2014

Influence of the stereo-EEG sensors setup and of the averaging on the dipole localization problem

Résumé

While scalp EEG/MEG source imaging have been extensively studied in the last two decades, the case of source localization from invasive measurements has resulted in few works to date. Yet there is a lot to gain from stereoelectroencephalographic (SEEG) recordings, providing high signal to noise ratio measurements of the explored brain structures. The SEEG setup consists in multi-contact electrodes inserted in the brain volume, each containing a dozen of collinear measuring contacts. This particular setup raises the question of the conditioning of the inverse problem. In recent works, we have evaluated the feasibility to localize a single dominant equivalent dipole facing different sensors and noise configurations. We deepen here the analysis by evaluating the influence of the chosen subset of sensors and of the number of averaged time samples on the accuracy of the localization. We conduct experiments on simulated data as well as on real epileptic spikes, illustrating the trade off to be made between these two factors.
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Dates et versions

hal-01066668 , version 1 (22-09-2014)

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  • HAL Id : hal-01066668 , version 1

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Steven Le Cam, Vairis Caune, Radu Ranta, Louis Maillard, Laurent Koessler, et al.. Influence of the stereo-EEG sensors setup and of the averaging on the dipole localization problem. 36th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC 2014, Aug 2014, Chicago, United States. ⟨hal-01066668⟩
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