Hi Lauri, that command does look right (and no need to worry about that
warning). The projfrac is the projection fraction. This is the distance
away from the white surface that fMRI will be sampled relative to the
thickness at that location. So a value of 0.5 means to sample in the
middle of the ribbon, which is probably where you want to sample. There
are other options (eg, you can sampled a fixed mm distance).
doug
On 2/2/2024 1:15 PM, Lauri Tuominen wrote:
External Email - Use Caution
Dear experts,
I am comparing freesurfer mri_vol2surf to nilearn surface.vol_to_surf.
I am finding large differences so I just wanted to get this command
absolutely right before making any sort of conclusions.
I would love if someone could confirm this is ok:
```
mri_vol2surf --mov task-rest_space-MNI152NLin6Asym.bold.nii.gz \
--mni152reg \
--hemi lh \
--surf white \
--o lh.task-rest_space-fsaverage.bold.nii.gz
```
Also I get complains about source volume voxel size (2,2,2) being
different from target voxel size (1,1,1). I did read somewhere that
this warning can be ignored. Is that correct?
fsfast pipeline seems to use default projection fraction 0.5, while
the default in the above command is 0. Could someone explain me the
reasoning behind this? I am wondering if I should be using 0.5 or 0
with my data.
Thank you so much!!
Lauri
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