Hi Michelle, do the eccen and polar maps look ok? Also, I would probably smooth them a little bit. The field sign calculation is basically a spatial derivative so it can be sensitive to noise. doug
Michelle Umali wrote:
Dear all, I've been having issues with my fieldsign images all I get are speckles. I did the following and did not get any errors:
- ran recon-all -all
- cut and saved occipital patches (rh.occip.patch.3d) from inflated surface
- ran mris_flatten -w 0 distances 20 7 rh.occip.patch.3d rh.occip.patch.flat
4)mkanalysis-sess -rtopy.self.rh -surface self rh -TR 2 -retinotopy 48 paradigm rtopy.par -nskip 4 fwhm 0 5) selxavg3-sess -a rtopy.self.rh -s sj09 6) fieldsign-sess -a rtopy.self.rh -occip -s sj09
When I looked at the fieldsign map using: 7) tksurfer-sess -a rtopy.self.rh -s sj09 -fieldsign
all I got were blue and red speckles. The polar and eccentricity maps seemed ok.
Any help would be great.
Michelle _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer