SEEG electrodes and subject's anatomy are not alligned

Discussions
,
19

Dear Tom,

The easier way would be for you to add the three fiducials NAS/LPA/RPA in the file with SEEG coordinates, in the same coordinate system.
If you can see your contacts correctly aligned in any program (freeview or others):

  1. Select three arbitrary landmarks NAS/LPA/RPA in the same program, for example the ones we describe here: http://neuroimage.usc.edu/brainstorm/CoordinateSystems
  2. Get the coordinates from this program and add them to the text file with the SEEG positions (edit the file with a text editor if you cannot add them from the interface of your program)
  3. When you import the anatomy of the subjects in Brainstorm: mark the exact same three anatomical landmarks in the MRI (NAS/LPA/RPA)
  4. When importing the channel positions (right-click on channel file > Add EEG positions > Import from file), all the contacts should be aligned in the Brainstorm coordinate system automatically.

Let me know if you need additional directions.
Cheers,
Francois