Hi group,

I recently reconstructed a high-resolution 3D T1-weighted structural MRI using Freesurfer. The subject had non-metallic extensions that were tied to her head through a series of braids. Looking at the MRI in TkMedit, I can noticeably see pieces of the extensions above her scalp. My group performs MR-constrained MEG/EEG analyses and use the outer surface of the scalp as well as the outer and inner surfaces of the skull from the Freesurfer reconstructed MRI to calculate a forward solution. Looking at the scalp, I notice large convolutions and indentations in the reconstructed skull in an MNE program: mne_analyze. My suspicion is that the hair extensions that appear in the reconstructed MRI are causing these indentations in the reconstructed skull. Is there a way to get rid of the artifacts caused by the extensions during the reconstruction process?

I am willing to provide whatever information is necessary to resolve this issue.

Thanks in advance,

Reid