Hi,

I am trying to resample two volumetric data onto freesurfer individual subjects. The volume images are NIFTI format from SPM results (spmT_0001.img and con_0001.img). I used the following command to resample spmT map onto the surface:

> mri_vol2surf --mov 3t0499/model/ravol/spmT_0001.img --reg 3t0499/register.dat --projfrac 0.5 --interp nearest --hemi lh --o ./lh.spmT_tmp.mgh --surf-fwhm 5 --noreshape > .mri_vol2surf.spmT.txt

and this worked fine when I checked lh.spmT_tmp.mgh using tksurfer. Similarly, I tried to resample the con_0001.img image, using the following command:

> mri_vol2surf --mov 3t0499/model/ravol/con_0001.img --reg 3t0499/register.dat --projfrac 0.5 --interp nearest --hemi lh --o ./lh.con_tmp.mgh --surf-fwhm 5 --noreshape > .mri_vol2surf.con.txt

Now, when I checked the results using tksurfer, majority of the surface vertices are valued zero, and these zero-valued vertices were NaN's when I read the mgh file in matlab. 

I expect the same resampling procedure to take place for the spmT map and the con map. There should be no difference between the spmT*.img and the con*.img except that the values at each voxel is different. But, why are the two *mgh files look so different? Why do I see NaN's in most of the vertices in the con*.mgh (while it seems spmT*.mgh looks fine)?

Joon

> more .mri_vol2surf.spmT.txt