Re: [Freesurfer] mris_fwhm problem

2018-12-21 Thread Greve, Douglas N.,Ph.D.
No, not in the current framework. Even if there were, fwhm=.66 would not give you much smoothing. The intervertex distance is about 1mm, at fwhm=.66mm, the nearest vertex would be about 3 standard deviations away, meaning that the smoothing would be minimal. On 12/21/18 12:12 PM,

Re: [Freesurfer] mris_fwhm problem

2018-12-21 Thread shahin
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

Re: [Freesurfer] mris_fwhm problem

2018-12-21 Thread Greve, Douglas N.,Ph.D.
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

[Freesurfer] mris_fwhm problem

2018-12-21 Thread shahin
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 --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

[Freesurfer] mris_fwhm problem

2009-03-27 Thread Yigal Agam
Hi, I'm getting an NAN value for some surfaces but not for others. Any ideas? Both surfaces below were generated using an identical process. [yi...@schnook sph_sm20]$ pwd /autofs/space/ventzl_001/users/SUBJECTS_DIR/mano010/bold/EMexec3/sph_sm20 [yi...@schnook sph_sm20]$ mris_fwhm --i