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:
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Dear 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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