Description
Wanted to get thoughts from others who may find this feature useful, and insights into possible straightforward ways to implement.
Describe the new feature or enhancement
In an effort to compare/overlay results in fMRI and EEG/MEG, several of us are seeking an easy way to export MNE source results to GIFTI (and potentially NIFTI in the future). GIFTI would allow other programs (e.g. AFNI, Freesurfer) to then work with source-space data in useful ways (e.g. constrain solutions based on fMRI, make pretty pictures).
Describe your proposed implementation
Add options to mne.SourceSpaces.save( ) or better - a new method .export( ) to allow the export of GIFTI images. For added convenience, with option for hemisphere, time-window of interest, and overwrite. Wrapper for nibabel's GIFTI implementation with nuances for writing the relevant data in.
https://nipy.org/nibabel/reference/nibabel.gifti.html
Additional comments
This would be decently useful for folks trying to do EEG-fMRI simultaneous, MEG & fMRI joint analysis, or anyone interested in taking the source estimates from MNE into other softwares (FieldTrip and BrainStorm both have GIFTI imports).