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Dear SPM expert:
 
    I want to transformation matrix mapping from voxel coordinates to real world coordinates.
    In the spm_vol function, the V.mat is the transformation matrix. However, this matrix is only valid for image after normalization using SPM. In other case, it seems to return an arbitrary matrix.
    Before normalization, how should I transform from voxel coordinates to real world coordinates?
 
 
Thanks a lot,
 
Liu Yang