Hi Jorge,

The register.dat maps the PET of an individual to the subject's anatomical? If so, then use mri_label2vol to map the aseg.mgz or aparc+aseg.mgz or ?h.aparc.annot to the native PET space for each subject, then use mri_segstats to average the intensities in each ROI -- this produces a text table, one for each subject.

doug

jorge luis wrote:

Hello all

I have PET images corregistered in spm with their corresponding MRI images obtained by converting brain.mgz to analyze. I have created in freesurfer the file register.dat for each one of them, so i can use tksurfer and tkmedit. Now I would like to compute for each PET image the average value of the pixels intensities in several regions resulting from the subcortical segmentation (for example hippocampus) and others manually painted.

Also I would like to produce an average region from all the individuals for each one of these selected regions (the average subject does not have a subcortical segmentation and it could be used as a mask in spm analysis).

Any tip is welcome

In advance Thank you

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