I am trying to figure out how to properly store our EEG data in BIDS using mne-bids.
We have data collected using an Easycap in standard 10-20 and fiducials (LPA, RPA, nasion) marked with Localite.
What I have done so far is add a montage to the dataset with
This results in ‘electrodes.tsv’ and ‘coordsystem.json’ in “space-CapTrak” (I guess this is ok?).
My question is how to properly document the fiducials in mri coordinates? Should I
- Transform the coordinates to the subjects MRI space and store them instead
- Update the fiducial coordinates stored in ‘…coordsystem.json’ to the ones from localite
- Add the fiducials to the T1w sidecar and leave ‘coordsystem.json/electrodes.tsv’ as they are now
- Something else
Thank you for any input on this!