I'm not sure what you mean. Are you saying the fwhm varies across axes?
If so, you can pass different fwhms for each axis to mrI_gtmpvc with the
--psf-col, --psf-row, --psf-slice options. If you are saying that PSF is
space variant, then we don't have good options.
On 6/17/2025 11:03 AM, Finn, Quentin wrote:
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Freesurfer experts,
I have an older PET scanner that has a nonhomogenous FWHM, varying in
the z-dimension (it's 5.1 x 5.1 x 5.6 )
How should I input this FWHM into mri_gtmpvc to get accurate PVC
results ?
Thanks so much!
-qf
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