Yeatman Lab Wiki

After running freesurfer on a subject's T1 anatomy we next need to create a BEM model.

cd /home/jyeatman/git/mnefun/bin
python run_mne_bem.py --subject NLR_201_GS --layers 1 --overwrite

Open mne_analyze to compute the coordinate alignment. In mne_analyze load the subject's surface and digitizer data:

File -> Load Surface -> Select Inflated
File -> Load Digitizer Data -> sss_fif -> select any raw file

Next adjust how these digitized points align with the scalp in the MRI

Adjust -> Coordinate Alignment
View -> Show viewer

Within the viewer window click the “Options” button. Within the “Viewer Options” dialogue check “digitizer data” and “HPI and landmarks only”.

Next mark the fiducial locations on the scalp. To do this click LAP, RAP and Nasion in the “Adjust coordinate alignment” dialogue and then mark each spot by clicking on the scalp surface . After marking each location click “Align using fiducials”.

From this point it is an art of getting as many of the digitizer points as possible to lie on the scalp. In the “Viewer Options” dialogue make the scalp transparent and un-check the “HPI and landmarks only” button. This will let you see where each digitized point lies with respect to the scalp. You want each point on the surface but not below it. Blue points are below the surface. Adjust points manually with the arrow buttons and using the ICP algorithm until you are happy.

Once you have aligned everything click “Save Default” in the coodinate adjustment dialogue. This will save out the transform in the subjects folder. Then, make a “trans” folder within the subject's directory and move transform file and rename subj-trans.fif

mne_analyze
File -> Load Surface -> Select Inflated
File-> Open

To adjust sensor plots: Adjust → Scales
To adjust source visualization: Adjust → Estimates