Hi Freesurfer developers,
I've processed my sample of T1 scans through recon-all and have corrected the pial and WM surfaces. The surfaces look mostly good, though when I checked the aseg segmentations they are pretty poor and there is huge variability in the volumes I get from asegstats2table (for instance, Left-Lateral-Ventricle is anywhere from 3773.1 to 22575.9). I was wondering if there's any way to improve the subcortical segmentations? Moreover, if the subcortical segmentations are poor, should I worry that there might also be errors in my cortical thickness or local gyrification index calculations (though the values for these show much less variability).
Many thanks, Colleen
Hi Colleen
can you upload a sample subject? Otherwise there is really no way for us to judge.
cheers Bruce
On Thu, 1 Mar 2018, C.P.E. Rollins wrote:
Hi Freesurfer developers,
I've processed my sample of T1 scans through recon-all and have corrected the pial and WM surfaces. The surfaces look mostly good, though when I checked the aseg segmentations they are pretty poor and there is huge variability in the volumes I get from asegstats2table (for instance, Left-Lateral-Ventricle is anywhere from 3773.1 to 22575.9). I was wondering if there's any way to improve the subcortical segmentations? Moreover, if the subcortical segmentations are poor, should I worry that there might also be errors in my cortical thickness or local gyrification index calculations (though the values for these show much less variability).
Many thanks, Colleen
freesurfer@nmr.mgh.harvard.edu
-
Bruce Fischl -
C.P.E. Rollins