Use 8mm. This is based on Joshi 2009 Reducing between scanner differences in multi-center PET studies, they smoothed it so that all data has psf=8mm
On 01/27/2017 08:11 AM, Eduard Vilaplana Martinez wrote:
Dear Freesurfer experts,
I'm processing ADNI PET data (AV45 and AV1451) in a surface-based approach following your guidelines (https://surfer.nmr.mgh.harvard.edu/fswiki/PetSurfer). Do you guys have any experience with ADNI data? I would like to apply partial volume correction but I don't know which is the FWHM of the point-spread function. I'm taking the most pre-processed images (i.e. co-reg, avg, std image and vox siz, uniform resolution), and ADNI say that "/Each image set is filtered with a scanner-specific filter function (can be a non-isotropic filter) to produce images of a uniform isotropic resolution of 8 mm FWHM, the approximate resolution of the lowest resolution scanners used in ADNI/."
Would using a 8mm FWHM for the PV correction be a correct approach? Any help would be greatly appreciated.
Thanks in advance Edu V.
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