why_openmeeg.rst

Why use OpenMEEG?

OpenMEEG offers better precision.

How do you measure precision?

Relative difference measure (RDM) (should be close to 0) and Magnitude error (MAG) (should be close to 1):

\mathbf{MAG} = \left\| \frac{V_{bem}}{\|V_{bem}\|_2} - \frac{V_{exact}}{\|V_{exact}\|_2} \right\| \,,\, \mathbf{RDM} = \frac{\|V_{bem}\|_2}{\|V_{exact}\|_2}

A sample sphere model with 5 dipoles:

Benchmark: OpenMEEG outperforms other implementations

See the following publication for more details on this comparison between different forward solvers:

1. Gramfort, T. Papadopoulo, E. Olivi, M. Clerc. OpenMEEG: opensource software for quasistatic bioelectromagnetics, BioMedical Engineering OnLine 45:9, 2010