I am a new user of Freesurfer. My questions are related to
the head modeling and MEG/EEG source modeling.
- Can freesurfer generate the 3-shell
boundary element model (BEM): 3 triangulated interfaces of air-scalp,
scalp-skull, skull-brain?
- Is it possible to generate a
closed and folded cortical surface after the segmentation on MR images? Freesurfer
seems to output two splitted hemispheres of cortex. I am particularly
concerning this, because I will use the cortical surface to constrain the MEG/EEG
source location and direction.
- Is it possible to evenly (or
nearly evenly) down-sample the vertices of a fine cortical surface into
around 6,000 points, onto which the elementary dipole will be placed? Freesurfer
generates the cortical surface with a huge number of triangles, which
makes it impossible for MEG-based source imaging.
Looking forward to your reply.
Best regards,
Zhongming Liu
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