Le dim. 19 juin 2022 à 22:43, Douglas N. Greve <dgreve@mgh.harvard.edu> a écrit :

You can try removing --default-seg-merge, but it may fail.
It can compute a relative SUV (relative to a give n ROI). By default, this will be pons, but you can chose others. SUV requires knowing things like the patients weight.

On 6/19/2022 4:15 PM, Bouchra Guelib wrote:
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mri_gtmpvc --i ADNI-PET.nii --reg template.reg.lta --psf 6 --seg gtmseg.mgz --default-seg-merge --auto-mask 1 .01 --mgx .01 --o gtmpvc.output

I am trying to do like that.

I tried to change the --seg gtmseg.mgz by aparc+aseg.mgz to obtain the 45 subcortical regions but it doesn't work

PS: does mri_gtmpvc compute SUV? or the mean intensity?
Le dim. 19 juin 2022 à 20:55, Douglas N. Greve <dgreve@mgh.harvard.edu> a écrit :
what is your mri_gtmpvc command line?

On 6/19/2022 2:22 PM, Bouchra Guelib wrote:
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These are the missing regions in which I want to obtain their SUVr.
Left-Lateral-Ventricle, Left-Inf-Lat-Vent, 3rd-Ventricle, 4th-Ventricle, Left-vessel, Right-Lateral-Ventricle, Right-Inf-Lat-Vent, 5th-Ventricle, WM-hypointensities, Left-WM-hypointensities, Right-WM-hypointensities, non-WM-hypointensities, Left-non-WM-hypointensities, Right-non-WM-hypointensities, Optic-Chiasm, CC_Posterior, CC_Mid_Posterior, CC_Central, CC_Mid_Anterior, CC_Anterior.
This is what I get when I apply mri_gtmpvc.

I already followed the link that you submitted to me.
Le dim. 19 juin 2022 à 15:54, Douglas N. Greve <dgreve@mgh.harvard.edu> a écrit :
On 6/15/2022 7:40 AM, Bouchra Guelib wrote:

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Hi,
I wonder if someone can help me to do something similar to that:
" the mean intensity of each FreeSurfer region (ROI) for the 45 subcortical and the 68 cortical regions were assessed the mean intensity of each FreeSurfer region (ROI) for the 45 subcortical and the 68 cortical regions were assessed to obtain SVU".
Also, I found an article that mentioned that " the estimated total intracranial volume (eTIV) is calculated, which is used later for normalization of the volumetric measures".
My questions are:

1) In " gtm.stats.dat" not all subcortical regions are mentioned, why?

which ones are missing?

2) I applied "mri_getmpc" to obtain the mean intensity, however, I could not figure out what I should do after this step to obtain the mean intensity and compute SVU.

Do you mean mri_gtmpvc? the values will be in the gtm.stats.dat file

3) why do they use eTIV, should I use it, and if yes how!

I don't know. It does not make sense to correct an intensity with eTIV.
btw, I assume you've seen this page MailScanner has detected a possible fraud attempt from "secure-web.cisco.com" claiming to be https://surfer.nmr.mgh.harvard.edu/fswiki/PetSurfer ?
best regards.

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