So, is there anyway around this issue?
> > The smoothing works through iterative nearest neighbor smoothing, so the > fwhm is essentially discretized because you can't have fractions of an > iteration. It looks like fwhm=0.66 is closer to 0 iterations than 1 > iteration, so it chooses 0. > > On 12/21/18 11:23 AM, sha...@nmr.mgh.harvard.edu wrote: >> Dear Surfers, >> I am trying to use mris_fwhm to apply fwhm=0.66 to my fmri data >> (voxel >> size 1 mm iso)using the below command: >> >> mris_fwhm --s <SBJ_NAME>--hemi rh --smooth-only --i >> fmcpr.sm0.self.projfrac_0.rh.nii.gz --fwhm 0.66 --o >> fmcpr.sm0p66_surf.self.projfrac_0.rh.nii.gz --mask >> /masks/brain.self.rh.nii.gz >> >> When I apply this command, it works without any error. The message on >> screen is as below: >> >> <SBJ_NAME> rh white >> Number of vertices 160391 >> Number of faces 320778 >> Total area 102725.085938 >> GroupSurface 0 >> AvgVtxArea 0.640467 >> AvgVtxDist 0.875515 >> StdVtxDist 0.253406 >> Loading mask masks/brain.self.rh.nii.gz >> Found 36045 voxels in mask >> Not Polynomial detrending >> Smoothing input by fwhm=0.660000, gstd=0.280276, niters=0 >> Only smoothing, so saving and exiting now >> >> But the outcome is the same as input. I think it is expected based >> on >> (niters=0). When I use the same command with fwhm =1, then i see the >> difference and niters=1. >> >> My question is, why is fwhm = 0.66 not acceptable? How can i solve this >> issue. >> >> Regards >> >> _____________________________________ >> >> Shahin Nasr >> >> Assistant Prof. in Radiology >> Harvard Medical School >> Martinos Imaging Center, MGH >> Bldg 149, 13th street, >> Charlestown, MA 02129 >> >> _______________________________________________ >> Freesurfer mailing list >> Freesurfer@nmr.mgh.harvard.edu >> https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer > > > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer > > > _____________________________________ Shahin Nasr Assistant Prof. in Radiology Harvard Medical School Martinos Imaging Center, MGH Bldg 149, 13th street, Charlestown, MA 02129 _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
