Dear Freesurfer's experts,
I computed some perfusion maps from ASL data. These perfusion maps were
registered on anatomical T1 and I would like to make a group analysis on
surfaces. Please find below my actual commands in order to project these
volumic maps on fsaverage then smooth the data projected on fsaverage :
*Project CBF maps on fsaverage* :
/mri_vol2surf --mov cbf.nii.gz --regheader subj_id--trgsubject fsaverage
--interp trilin --projfrac 0.5 --hemi lh --o lh.fsaverage.cbf.mgh
--noreshape --cortex --surfreg sphere.reg//
//mri_vol2surf --mov cbf.nii.gz --regheader subj_id--trgsubject
fsaverage --interp trilin --projfrac 0.5 --hemi rh --o
rh.fsaverage.cbf.mgh --noreshape --cortex --surfreg sphere.reg/
*Smooth the data projected on fsaverage (native ASL data size voxel of
3mm)* :
/mris_fwhm --s fsaverage --hemi lh --smooth-only --i
lh.fsaverage.cbf.mgh --fwhm 3 --o lh.fwhm3.fsaverage.cbf.mgh --mask
brain.fsaverage.lh.mgh//
//mris_fwhm --s fsaverage --hemi rh --smooth-only --i
rh.fsaverage.cbf.mgh --fwhm 3 --o rh.fwhm3.fsaverage.cbf.mgh --mask
brain.fsaverage.rh.mgh/
Could you advise me on these two steps and tell me first if this is the
best way to project CBF maps on fsaverage, then to smooth the data on
surfaces ? Is my process could be improved ?
Best regards,
--
-----------------------------
Matthieu Vanhoutte, MSc
Research Engineer - Department of Neuroradiology
Regional University Hospital, Lille, France
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