Bipolar montage creation/export after GARDEL

Discussions
1

Hi,

I need to export seeg contact anatomical location in both the monopolar and bipolar format. We’ve been wanting to update our method using the gardel tool.
So far the methods works great, and I can export monopolar montage, but I struggle to export a bipolar montage.

I have been following the following steps :

  • import MRI (set nas, LPA,RDA)
  • import post op CT (yes > spm >yes >spm)
  • change the amplitude to get a great separation between the contacts
  • generate the isosurface using the amplitude from before
  • create the SEEG/ECOG implantation (MRI+CT+Isosurf)
  • do the gardel localisation
  • check, correct and manually label all of my electrodes
  • save
  • mni normalisation (maff8)
  • Export monopolar contacts

After that, I can’t seem to be able to get the bipolar montage.

Can I get that bipolar montage without importing a raw file ?

If I have to import a raw file (TRC) how do I use my SEEG/ECOG electrodes localisation for the montage instead of the automatic micromed channel ?

thanks for your help

2

You do need link the data in order to have see the montages that can be applied to it.

You need to:

  1. Link the recordings, to the Subject. This will create a new study folder in that Subject.
  2. Then, check the channel file that is created, to verify it has the same names as the channel file in the Implantation folder
  3. Right-click on the channel file in the data folder, and select Add EEG positions > From other studies > Implantation

You can see these steps in details in this tutorial:
https://neuroimage.usc.edu/brainstorm/seeg/SeizureFingerprinting