Do the two inputs have different voxel sizes? The gtm.stats.dat file
reports the number of voxels so if the volumes have different voxels
sizes, you will get different values out. If this is not the source of
the problem, please send the gtm.stats files.
On 3/15/2023 4:06 AM, Federica Di Antonio wrote:
External Email - Use Caution
of course: I run the same line of command for both amyloid and tau pet
images with a fwhm = 1 in order to see what have happened
mri_gtmpvc --i taupet.nii --reg tau.reg.lta --psf 1 --seg gtmseg.mgz
--auto-mask 1 .01 --mgx .01 --no-rescale --o tau.output
mri_gtmpvc --i amypet.nii --reg amy.reg.lta --psf 1 --seg gtmseg.mgz
--auto-mask 1 .01 --mgx .01 --no-rescale --o amy.output
when I extract gtm.stats.dat file and I compare the number of voxels
for the same regions (and for the same subject of course) I obtain
these values (attached files). Can I suppose this effect descends from
the flag --automask? maybe the different automatic masks lead to
different pixel size.. I don't know, I would be very grateful for any
information.
Thanks for all the help you can give me about; sincere greetings from
Federica Di Antonio
Il giorno lun 6 mar 2023 alle ore 16:31 Douglas N. Greve
<dgr...@mgh.harvard.edu> ha scritto:
can you send an example?
On 2/17/2023 9:38 AM, Federica Di Antonio wrote:
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Dear experts,
I hope this email finds you well.
I run the pvc correction with mri_gtmpvc for subjects data
obtained with two different PET tracers.
In gtm.stats.dat, for every subject and every region, the number
of voxels evaluated for amyloid tracer is approximately twice the
volume evaluated for the second tracer.
I'd expect that the volume of a region for the same subject
doesn't change with the tracer.
Do you think this error can result from previous errors in the
analysis? Or is it in some way plausible?
Thank you for your patience,
Federica
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