> There is also a possibility to use another BEM implementation OpenMEEG
> (http://www-sop.inria.fr/athena/software/OpenMEEG/). That's something
> that works and I tested it last year, but found it impractical for
> most users again because of difficulties with installation
we're working on this. New windows 64, linux 64 and Mac OS X installers will
be available shortly with the 2.1 release that adds speed improvements
using the adjoint approach.
> and long
> computation time (about 24 h for normal mesh).
we will be presenting at HBM this year our improvements using the adjoint
approach that brings computation on the SPM canonical mesh to 1h40
on a Linux 64 with 8 cores machine (3h45 with non-adjoint method).
> The differences in the
> lead fields with our BEM were only for a small number of vertices
> close to the surface.
That is the whole point of the symmetric BEM. Give precision for dipoles
close to the inner skull (sources on top of gyri). Note that OpenMEEG
features also lead fields computation for EIT and Internal Potential
calculation (see. "Forward field computation with OpenMEEG"
Alexandre Gramfort, Théodore Papadopoulo, Emmanuel Olivi, and M. Clerc
to appear in the special issue:
"Academic Software Applications for Electromagnetic Brain Mapping
Using MEG and EEG")
Alex and the OpenMEEG developers.
Alexandre Gramfort, PhD
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Dept. of Radiology MGH Martinos Center / Harvard Medical School