How did you reslice? If you used trilinear interpolation, then that would mess up the values; use nearest neighbor. Also, check out PETsurfer https://surfer.nmr.mgh.harvard.edu/fswiki/PetSurfer which can do this sort of thing in a principled way


On 9/27/2021 11:17 AM, Ryan Wales wrote:

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Hello,

I'm using fmriprep's aparcaseg_dseg.nii (still FreeSurfer code, right?) to create ROI masks. I wish to coregister and reslice this segmentation file to match the native space for another image (PET), then extract SUVR values for each ROI. However, after coregistration, the lookup values are no longer faithful to their original values. Would there be a way to view or create a new color LUT that reflects that aparcaseg_dseg.nii map in a different space?

Thank you,
Ryan

--
Ryan Wales (he/him), M.A.
Ph.D. Candidate
Integrative Neuroscience
Psychology Department
Stony Brook University


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