I've just created a new wiki to describe how to do this:

https://surfer.nmr.mgh.harvard.edu/fswiki/FsAnat-to-NativeAnat

Guang Zeng wrote:
> Hi, there,
>
> I used FreeSurfer pipeline to study a subject, I convert my .nii file to .mgz 
> file, and then 
> send it to FreeSurfer pipeline.Everything works well. Now I want to convert 
> the 
> wmparc.mgz back to the space that the original volume was.
>
> I tried two command
> mri_covert wmparc.mgz -rl orig.nii new.nii 
>
> and 
> mri_vol2vol --mov wmparc.mgz --targ orig.nii --regheader --o new.ii
>
> Both of them gave me the same problem.
> My original volume is :
>
> qform_name     *Aligned Anat*
> qform_code     2
> qto_xyz:1      -1.198313  -0.049354  0.044215  94.332878
> qto_xyz:2      -0.041108  1.237333  0.172261  -131.942123
> qto_xyz:3      0.048546  -0.170504  1.237284  -105.448372
> qto_xyz:4      0.000000  0.000000  0.000000  1.000000
> qform_xorient  *Right-to-Left*
> qform_yorient  Posterior-to-Anterior
> qform_zorient  Inferior-to-Superior
> sform_name     *Aligned Anat*
> sform_code     2
> sto_xyz:1      -1.198313  -0.049354  0.044217  94.332878
> sto_xyz:2      -0.041108  1.237333  0.172261  -131.942108
> sto_xyz:3      0.048547  -0.170504  1.237284  -105.448372
> sto_xyz:4      0.000000  0.000000  0.000000  1.000000
> sform_xorient  *Right-to-Left*
> sform_yorient  Posterior-to-Anterior
> sform_zorient  Inferior-to-Superior
>
> Now the new resampled volume is:
>
> qform_name     *Scanner Anat*
> qform_code     1
> qto_xyz:1      1.198313  -0.049354  0.044217  -96.198837
> qto_xyz:2      0.041108  1.237333  0.172261  -138.478333
> qto_xyz:3      -0.048547  -0.170504  1.237284  -97.729370
> qto_xyz:4      0.000000  0.000000  0.000000  1.000000
> qform_xorient  *Left-to-Right*
> qform_yorient  Posterior-to-Anterior
> qform_zorient  Inferior-to-Superior
> sform_name     *Scanner Anat*
> sform_code     1
> sto_xyz:1      1.198313  -0.049354  0.044217  -96.198837
> sto_xyz:2      0.041108  1.237333  0.172261  -138.478333
> sto_xyz:3      -0.048547  -0.170504  1.237284  -97.729370
> sto_xyz:4      0.000000  0.000000  0.000000  1.000000
> sform_xorient  *Left-to-Right*
> sform_yorient  Posterior-to-Anterior
> sform_zorient  Inferior-to-Superior
>
> When I use fslview to view these two volumes, their orientations were swapped.
> Could you help me fix this problems?
>
> Thanks a lot!
>
> Guang
>
>
>   
>
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