[vtk-developers] A NIFTI Reader for VTK

[Bill Lorensen]

It seems you did not use the nifti library?

On Tue, Feb 19, 2013 at 12:20 PM, David Gobbi <david.gobbi at gmail.com> wrote:
> Hi All,
>
> I've pushed a topic with a reader/writer for the NIFTI file format:
> http://review.source.kitware.com/#/t/2160/
>
> Overall, it's made to be similar to the ITK NIFTI-IO, so it is
> quite different from the paraview NIFTI classes.  The main
> thing is how it deals with dimensions:
>
> 1) It does not filter (i.e. re-order) the x,y,z dimensions.  Instead,
> it provides a matrix to to convert the raw image coordinates
> into NIFTI coordinates (RAS coordinates).  Actually it provides
> two such matrices: one for the NIFTI qform, and another for
> the NIFTI sform.
>
> 2) Multi-dimensional NIFTI images are read as multi-component
> VTK images.  So a NIFTI vector image becomes a VTK image
> with 3 components.  A NIFTI tensor image becomes a VTK image
> with 6 (or 9) components.  It's up to the application to determine
> the intent of the data.
>
> 3) The time dimension is ignored unless a specific flag
> "TimeAsVector" is set.  If that flag is set, then subsequent
> time points are read into subsequent scalar components. In other
> words, a time image becomes a vector image.  This is a trick
> that I've been using for years to deal with 4D images in VTK.
>
> 4) There isn't much support for NIFTI metadata yet.
>
> I'd be glad to hear feedback from anyone who is familiar with
> NIFTI.
>
>  - David
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