I am trying around with stereo-EEG data in brainstorm; I already managed to import the data and events successfully from matlab.
Now, the coordinates of the SEEG channels are only available in the MNI coordinate system. I could also create a channel file and load this into brainstorm, and it correctly identifies the channels as SEEG channels. The channels, however, are now located somewhere outside the head. Until now, I could not find a way to tell brainstorm that the coordinates are in the MNI space, so it would know what to do with them. Do you have an idea?
I’m sorry, I haven’t had the time to write the import of channel files in MNI coordinates yet.
For now, you have to do the conversion MNI=>MRI manually. Some guidelines at the bottom of this page: http://neuroimage.usc.edu/brainstorm/CoordinateSystems
Right-click on the channel file > Edit channel file > Set the type of the channels as SEEG. Close window to save.
Right-click on the channel file > MRI registration > SEEG: Edit (MRI Viewer).
In the MRI viewer, place the cursor where you want, right-click on the figure, place your contact
Alternatively, if you can set the contact positions in a different environment and export them to a text file, it can be simpler.
In this other environment (eg. neuronavigation system): add the position of the anatomical references NAS/LPA/RPA (use the same positions as set in the MRI viewer in the Brainstorm).
In Brainstorm, right-click on the channel file > Add EEG positions > Import from file, select the exported text file. If the points NAS/LPA/RPA are correctly set in the text file, the position of all the contacts should be converted automatically to Brainstorm coordinates.
FYI: We improved significantly the tools available in Brainstorm for processing and visualizing SEEG and ECOG data, including new options for volume coregistration. They are now documented in a new tutorial: http://neuroimage.usc.edu/brainstorm/Tutorials/Epileptogenicity
