BUG: fixes issue #1037 related to a surplus transformation from physical to voxel space.
BUG: fixes issue #1037 related to a surplus transformation from physical to voxel space.

3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox