Section: New Software and Platforms

FindSources3D

Participant : Juliette Leblond [corresponding participant] .

Status: Currently under development. A stable version is maintained.

This software is developed in collaboration with Maureen Clerc and Théo Papadopoulo from the Athena Project-Team, and with Jean-Paul Marmorat (Centre de mathématiques appliquées - CMA, École des Mines de Paris).

FindSources3D (CeCILL license, APP version 2.0 (2012): IDDN.FR.001.45009.001.S.A.2009.000.10000) is a software dedicated to source recovery for the inverse EEG problem, in 3-layer spherical settings, from point-wise data (see http://www-sop.inria.fr/apics/FindSources3D/ ). Through the algorithm described in [9] and Section  4.2 , it makes use of the software RARL2 (Section  5.1 ) for the rational approximation step in plane sections.

A new release of FindSources3D is now available, which will be demonstrated and distributed, in particular to the medical team we maintain contact with (hosp. la Timone, Marseille). The preliminary step (“cortical mapping”) is now solved using expansion in spherical harmonics, along with a constrained approximation scheme.

Another release is being prepared, due to strong interest by the German company BESA GmbH (http://www.besa.de/ ), which develops EEG software for research and clinical applications. A deeper collaboration with this company started last year. Figure 4 shows good results on a two sources distribution recovered by FindSources3D from values of the potential at electrodes on a sphere (scalp) generated by BESA's simulator. There, the localization error is satisfactory, see [28] . Altogether FindSources3D provides suitable initial guess to heavier dedicated recovery tools, including an estimate of the number of sources see Section 6.1.1 .