There are several ways it might work depending upon how you ran it. This
is why I was asking for your command line.
On 4/24/2022 4:46 PM, Zhener Zhang wrote:
External Email - Use Caution
Hi Douglas,
Thank you for the reply!
The mri_gtmpvc outputs were expected and there was no reason for us to
suspect that something was wrong. I was just curious as to the general
process behind PETSurfer’s ROI-wise value calculation. Was each
ROI-wise output generated by averaging across all voxels of an ROI?
Thanks!
Zhener Zhang
On Apr 20, 2022, 09:50 -0700, Zhener Zhang <zhe...@stanford.edu>, wrote:
Hello,
I have a question regarding the way ROI-wise values are calculated
using PETSurfer.
We ran the PETSurfer pipeline with PVC=0 and noticed that a
relatively small ROI like Putamen has one of the highest values of
regional distribution of a PET tracer.
Is it the case that the PETSurfer ROI-wise value outputs were
averaged, or normalized by each ROI’s volume? And what measure was
divided, GM volume, number of voxels, or something else?
Thank you in advance!
Best regards,
Zhener
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