What is the value for cerebellum in those three scenarious (gtm, no pvc, and mgx)?
On 3/10/2020 12:37 PM, Eckbo, Ryan wrote:
Hello experts,
I've recently run into a case the gtmstats uptake (reference region: cerebellum) for the pericarlcarine ROI's are as low as 0.40, however computing the voxel wise mean using input.rescaled.nii.gz and mgx.ctxgm.nii.gx and aux/seg.nii.gz, the values are closer to 1, as expected:
| vol | psf | roi | gtmstats_uptake | mean_uptake | | --------------------- | --- | -------------------- | --------------- | ----------- | | input.rescaled.nii.gz | 0 | ctx-rh-pericalcarine | 0.807 | 1.226… | | input.rescaled.nii.gz | 0 | ctx-lh-pericalcarine | 0.758 | 1.083… | | input.rescaled.nii.gz | 6 | ctx-rh-pericalcarine | 0.409 | 1.197… | | input.rescaled.nii.gz | 6 | ctx-lh-pericalcarine | 0.470 | 1.058… | | mgx.ctxgm.nii.gz | 0 | ctx-rh-pericalcarine | 0.807 | 1.007… | | mgx.ctxgm.nii.gz | 0 | ctx-lh-pericalcarine | 0.758 | 0.888… | | mgx.ctxgm.nii.gz | 6 | ctx-rh-pericalcarine | 0.409 | 0.915… | | mgx.ctxgm.nii.gz | 6 | ctx-lh-pericalcarine | 0.470 | 0.809… |
This is using Freesurfer 6.0, and the PET to anatomical registration looks fine.
Any ideas why we get such bad values from the GTM method?
Thanks for any help, Ryan
Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer