[Paraview] Saving vti file to NifTI format - resulting geometry not correct

[Timothy Brown]

Hi ParaView users,

I am converting vti data (MRI) to NifTI and am experiencing an error.  I 
have attached an image that
illustrates the geometry, as well as what I think may be the issue.

The voxels in the MRI were not isotropic.  The top row of the image shows 
the head, the proportions
of which appear correct, as well as some of the Data Arrays information. 
Note vtkVolumeSpacing
0.9375, 2   - this matches the MRI acquisition.

Using ParaView 4.0.1 (version included in graphic) I save data as NifTI. I 
then loaded the NifTI, and
as you can see, colored pink on second row, it is compressed along one 
axis.  Note vtkVolumeSpacing
1, 1 - I think this could be source of error.

I also attempted to save to Analyze format with similar result.

I'd appreciate any help/feedback,

Many thanks,
-Timothy


Timothy Brown                 email: timothy at cis.jhu.edu
Computational Anatomist       phone: 410.516.7551
Center for Imaging Science    fax:   410.516.4557
Johns Hopkins University
301 Clark Hall
3400 N. Charles Street
Baltimore, MD 21218
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