Hello,
General: Is it possible to manually determine the positions of the surface (!) electrodes?
We implant epilepsy patients with invasive DIXI electrodes, stick 50 surface electrodes and run a CT- FASTRACK. We do not have/use a Polhemus device. Therefore we manually determine the position out of the CT-scan, until now in the CURRY software.
In Brainstrom, the tool to label the invasive EEG contacts including exporting a file with the coordinates and anatomical is working very well! I want to the determine also the surface electrodes, so I know the exact position in the coordinate system (without using CURRY in addition).
Thank you
To manually setting the location of an EEG electrode, once the channel file is created, you can edit the EEG sensor positions, on the channel file right-click > MRI registration > Edit
In this new window, use the button Move an electrode (
), which allows to move the electrode position over the head surface with the button. Hover the different buttons in the toolbar to have their description.
Additionally, in the Surface tab, you can click on Add a surface (
) to add the 3D MRI (or CT) slices to the figure.
Finally, you can export those locations with right-click > File > Export to file using the format EEG/NIRS: ASCII: Name, XYZ (*.txt) which provides the locations in the SCS in millimeters.
Thank you so much for your help!
Is it also possible to edit the channel file, for example to delete channels? In my case a lot of non-used channels were imported as well.
And is it possible to export all EEG contact labels with in *.tsv format like it is possible with the sEEG contact labels creating an anatomical labeling?
...appreciating your time.
The channel file needs to match the number of time series. So, it may be better option just to set the type of those sensors to MISC (for miscellaneous), so they are ignored for any processing.
Yes, just that is the option right-click > File > Export to file using the format EEG: BIDS electrodes.tsv, subject space mm (*.tsv)
