Figure 9

Pipelines for computing lead fields with OpenMEEG. Diagram for the low level pipeline for computing MEG and EEG leadfields (a.k.a., gain matrices) using OpenMEEG. To facilitate the understanding of this diagram one can give an example. An EEG gain matrix is obtained with the om_gain command using with option -EEG taking as input an inverted head matrix, an EEG sensors matrix and a source matrix. The source matrix can be obtained using om_assemble taking as input a head model (geometry and conductivities) and a source descriptionfile (option -dsm when using isolated dipoles). The inverted head matrix is obtained using om_minverser from a head matrix which is obtained using om_assemble and the option -HM from a head model (geometry and conductivities).