This might be the wrong forum for this question, so apologies!
I’m attempting to carry out source localization and I’m currently working on calculating a forward solution. I have EEG data from our participants and a T1; the EEG data was not collected during the MRI scan. I used FreeSurfer to reconstruct structural data from our participants, and then ran
mne.bem.make_scalp_surfaces(subject=subject,subjects_dir=subjects_dir)
As part of our study protocol, we were placing a bead on our participants’ heads as a marker. This is visible on the T1, floating above their head. However, on the bem/head-dense.fif file the bead is now merged into their head (and they look a bit like Hellboy…).
Any advice on how to deal with this? A few more specific questions, if helpful:
a) Is there a way to run FreeSurfer to prevent the bead from being visible?
b) Is there an easy / fast way to fix this in Python/MNE?
c) Is this problem even needing to be fixed? The bead is on their forehead, so I’m thinking it could mess with source localization.
I imagine the problem would be the same as if the EEG data was collected during the MRI, except instead of 1 bead I’d have 64 electrodes fused into the head.
Any thoughts or information would be greatly appreciated. Thanks!
-Kirk