External Email - Use Caution
Thank you Doug! I have another question related to voxel size.
In the GTM PVC pipeline, the gtm.stats.dat file also outputs the NVoxels. However, is there a way to easily retrieve the volume (instead of NVoxels) for each ROI within the gtm.stats file? I know that you should rescale by the pet voxel size; however, I have a multi-site study with all different voxel sizes. Or is there perhaps a way to apply the "aparcstats2table -meas volume" command but get the same ROIs outputted as those in the gtm.stats file?
Thank you for the info! Julie
On Wed, 23 Dec 2020 at 13:11, Greve, Douglas N.,Ph.D. < DGREVE@mgh.harvard.edu> wrote:
No, not a problem.
On 12/21/2020 12:52 PM, Julie Ottoy wrote:
External Email - Use CautionDear freesurfer team,
I am dealing with PET scans that were acquired at different sites. They do not have uniform voxel size and dimensions. I was wondering if this would be an issue for the sGTM and MG PETSurfer-PVC and/or for the "vol2surf --projfrac 0.5" and vertex-wise PET group-analyses. Should I resample to a uniform voxelsize prior to these steps or does freesurfer take care of this issue internally?
Thank you for the information. Best regards Julie
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