Dear Freesurfer experts,

I'd like to transform a surface S to a native volume V which is not the 
original T1.

I first computed the transform V_to_orig.mat using flirt. Loading the resulting 
volume and the lh.pial showed satisfactory results in freeview.

Now I'd like to obtain the surface in the native volume.  For this I tried 
applying the inverse of the flirt xform using mri_surf2surf: 

tkregister2 --fsl orig_to_V.mat --mov orig.nii --targ V.nii.gz --reg 
orig_to_V.dat --noedit
mri_surf2surf --sval-xyz pial --reg orig_to_V.dat --tval pial.native --tval-xyz 
--hemi lh --s subject

However the resulting surface is offset and orthogonal to the native volume.  

Am I missing anything in the tkregister2 command?  

Thanks for your help,

Arnaud 






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