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

[Utkarsh Ayachit]

Timothy,

If you try saving out a vti file, is everything working correctly?
Seems to me the Nifti/Analyze writers are not respecting the spacing
that vtkImageData is providing. I wonder if the writer was hard coded
to use the meta-data provided by Nifti/Analyze readers to determine
the spacing and hence could work if you opened and good Nifti file and
then saved it out.

Utkarsh

On Wed, Sep 18, 2013 at 3:57 PM, Timothy Brown <timothy at cis.jhu.edu> wrote:
> 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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