[Rtk-users] RTK Python Wrapper—Missing CudaFDKBackProjectionImageFilter and Update Request

[Simon Rit]

Hi Linxi,
The two version on pypi, cuda124 and cuda116, both have the same content.
If you want a wheel that contains CudaFDKBackProjectionImageFilter, you'll
have to download it from the CI until the next release. The wheels are
available as artifacts in github actions if you're logged in GitHub. See
here <https://github.com/RTKConsortium/RTK/actions/runs/18792156269> for
the latest main build.
Simon

On Wed, Oct 29, 2025 at 7:11 AM Linxi Shi <linxit at neuraltrak.com> wrote:

> Hi Simon,
>
> We’re a Silicon Valley startup building 3D image guidance for surgery.
>
> At a high level: our product uses RTK. We initially installed the
> precompiled package via:
>
> python -m pip install itk-rtk-cuda116
>
> Everything worked until we uncovered a quantitative mismatch in the
> reconstruction, which we traced to a missing filter-
> CudaFDKBackProjectionImageFilter-that (per your note on our issue thread
> <https://github.com/RTKConsortium/RTK/issues/835>) wasn’t included until *June
> 4* so it is confirmed that it is missing in our version.
>
> We see the instructions
> <https://docs.openrtk.org/en/latest/INSTALLATION.html> now reference
> *cuda124*, but we’re not sure whether the Python wrapper/CI has been
> updated to include this filter. Could you confirm if there’s an updated
> wrapper that contains CudaFDKBackProjectionImageFilter? If not, we’d
> appreciate guidance on the best workaround.
>
> We’ve been stuck for long. Thanks so much for your help on this.
>
> Best,
> Linxi
>
>
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