I'm not sure what you are looking for as it is just the equation of a gaussian. The PSF is given as the full-width-half-max. This is converted to a std dev with
gstd = fwhm/sqrt(log(256.0))

On 2/18/2024 7:03 AM, Federica Di Antonio wrote:

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Dear experts,

I'm employing PETsurfer for partial volume correction.
Could you share the definition or formula you use to define the psf (flag --psf of mri_gtmpvc) that is used to correct the PET image?
I understand that it is an isotropic gaussian filter, but could you maybe provide the precise formula you employ or the reference you refer to?

Thank you so much for your kindness and availability,

Federica Di Antonio
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