[vtk-developers] A NIFTI Reader for VTK

[Bill Lorensen]

I only asked, because ITK does use the library. Hans Johnson from
UIowa is active in the nifti community. I know is supports
compression. I'm not sure what else it provides. I've cc'ed Hans

On Tue, Feb 19, 2013 at 1:01 PM, David Gobbi <david.gobbi at gmail.com> wrote:
> No, I didn't.  The NIFTI library doesn't provide very much in terms
> of functionality (NIFTI is a very simple file format).  About the only
> thing I would have from it would be the function to byte-swap the
> header.  So I didn't see the point of bringing another third-party
> library into VTK.  Not for a file format that is just a fixed-format
> header followed by raw data.
>
>  - David
>
> On Tue, Feb 19, 2013 at 10:49 AM, Bill Lorensen <bill.lorensen at gmail.com> wrote:
>> 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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>>
>>
>>
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