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Dear Doug,
I was wondering why the flag --prune is recommended (petsurfer website)
when creating a stacked pet file and during surface-smoothing. If I
understood correctly, this would set all vertices that are 0 in at least
one subject to 0 ("set vox to 0 unless all frames are non-zero")? In my
non-pvc data, it seems as though a lot of the surface-projected values are
0. Hence, when I perform a surface-based regression between PET and a
regressor and I use the --prune flag during mri_concat, I don't get any
results.
Thank you!
best regards
Julie
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