On 10/20/15 7:19 AM, Victor Montal Blancafort wrote:
FS experts,
I have seen several posts regarding volume-to-surface projections, but I am not 100% confident about which parameter should I use with mri_vol2surf that better fit my needs.
Currently, my data are several DTI-metric volumes per subject already normalized to MNI152 space (both 1mm and 2mm voxel sizes). My intention is to move cortex values of those volumes into the fsaverage surface space. I know that mri_vol2surf will work, but I have some doubts on how this work.
In general, this is a bad idea. You should keep everything in native space, then map to the native space of the subject, then to fsaverage. You'll lose a lot going from mni152 directly to fsaverage.
- If no extra commands are used (i.e projfrac or projdist), what will
each value of the vertex mesh represent? A specific voxel value?
Yes
- If my intention is to project the mean value across white and pial
surface, which exact command should I use?
Add --projfrac-avg 0 1 .1
- There exists any specific command to move from MNI152 volume (FSL)
to fsaverage surface (avoiding bbregister)?
You can use spmregister or fslregister (though bbregister should work too)
- Statistically, smoothing my data at the surface for further VBM
analyisis(i.e moving later the surface values to volumes), will introduce any bias?
I don't understand
Thank you in advance for your time and help! Cheers,
Victor Montal
Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer