<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div dir="ltr"><meta http-equiv="content-type" content="text/html; charset=utf-8"><div dir="ltr"><span></span><br><span></span><p class="MsoNormal" style="font-size: 12pt; -webkit-text-size-adjust: auto; margin: 0in; font-family: Aptos, sans-serif;">Hi Simon,<o:p></o:p></p><p class="MsoNormal" style="font-size: 12pt; -webkit-text-size-adjust: auto; margin: 0in; font-family: Aptos, sans-serif;">We’re a Silicon Valley startup building 3D image guidance for surgery.<o:p></o:p></p><p class="MsoNormal" style="font-size: 12pt; -webkit-text-size-adjust: auto; margin: 0in; font-family: Aptos, sans-serif;">At a high level: our product uses RTK. We initially installed the precompiled package via:<o:p></o:p></p><p class="MsoNormal" style="font-size: 12pt; -webkit-text-size-adjust: auto; margin: 0in; font-family: Aptos, sans-serif;"><span style="font-size: 10pt; font-family: "Courier New";">python -m pip install itk-rtk-cuda116<o:p></o:p></span></p><p class="MsoNormal" style="font-size: 12pt; -webkit-text-size-adjust: auto; margin: 0in; font-family: Aptos, sans-serif;">Everything worked until we uncovered a quantitative mismatch in the reconstruction, which we traced to a missing filter-<span style="font-size: 10pt; font-family: "Courier New";">CudaFDKBackProjectionImageFilter</span>-that (per your note on our issue <a href="https://github.com/RTKConsortium/RTK/issues/835" style="color: rgb(70, 120, 134);">thread</a>) wasn’t included <span dir="ltr" style="text-decoration: underline;">until </span><b><span dir="ltr" style="text-decoration: underline;">June 4</span></b> so it is confirmed that it is missing in our version.<o:p></o:p></p><p class="MsoNormal" style="font-size: 12pt; -webkit-text-size-adjust: auto; margin: 0in; font-family: Aptos, sans-serif;">We see the <a href="https://docs.openrtk.org/en/latest/INSTALLATION.html" style="color: rgb(70, 120, 134);">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 style="font-size: 10pt; font-family: "Courier New";">CudaFDKBackProjectionImageFilter</span>? If not, we’d appreciate guidance on the best workaround.<o:p></o:p></p><p class="MsoNormal" style="font-size: 12pt; -webkit-text-size-adjust: auto; margin: 0in; font-family: Aptos, sans-serif;">We’ve been stuck for long. Thanks so much for your help on this.<o:p></o:p></p><p class="MsoNormal" style="font-size: 12pt; -webkit-text-size-adjust: auto; margin: 0in; font-family: Aptos, sans-serif;">Best,<br>Linxi</p></div></div></body></html>