<div dir="ltr"><div>Hi Linxi,</div><div>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 <a href="https://github.com/RTKConsortium/RTK/actions/runs/18792156269">here</a> for the latest main build.</div><div>Simon</div></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Wed, Oct 29, 2025 at 7:11 AM Linxi Shi <<a href="mailto:linxit@neuraltrak.com">linxit@neuraltrak.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class="msg-1616690570725895078">
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<p class="MsoNormal"><span>Hi Simon,<u></u><u></u></span></p>
<p class="MsoNormal"><span>We’re a Silicon Valley startup building 3D image guidance for surgery.<u></u><u></u></span></p>
<p class="MsoNormal"><span>At a high level: our product uses RTK. We initially installed the precompiled package via:<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Courier New"">python -m pip install itk-rtk-cuda116<u></u><u></u></span></p>
<p class="MsoNormal"><span>Everything worked until we uncovered a quantitative mismatch in the reconstruction, which we traced to a missing filter-</span><span style="font-size:10pt;font-family:"Courier New""><span>CudaFDKBackProjectionImageFilter</span></span><span>-that
(per your note on our issue <a href="https://github.com/RTKConsortium/RTK/issues/835" target="_blank">
thread</a>) wasn’t included until <b>June 4</b> so it is confirmed that it is missing in our version.<u></u><u></u></span></p>
<p class="MsoNormal"><span>We see the
<a href="https://docs.openrtk.org/en/latest/INSTALLATION.html" target="_blank">instructions</a> now reference
<b>cuda124</b>, 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
</span><span style="font-size:10pt;font-family:"Courier New""><span>CudaFDKBackProjectionImageFilter</span></span><span>? If not, we’d appreciate guidance on the best workaround.<u></u><u></u></span></p>
<p class="MsoNormal"><span>We’ve been stuck for long. Thanks so much for your help on this.<u></u><u></u></span></p>
<p class="MsoNormal"><span>Best,<br>
Linxi<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt"><u></u> <u></u></span></p>
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