<div dir="ltr"><div>Hi,</div><div>The preprocessing is described with a graph at</div><div><a href="http://www.openrtk.org/Doxygen/classrtk_1_1ProjectionsReader.html">http://www.openrtk.org/Doxygen/classrtk_1_1ProjectionsReader.html</a></div><div>Follow the Elekta path. I0 is used by <a href="http://www.openrtk.org/Doxygen/classrtk_1_1LUTbasedVariableI0RawToAttenuationImageFilter.html">LUTbasedVariableI0RawToAttenuationImageFilter</a>. You can process the projection one by one but you should also apply <a href="http://www.openrtk.org/Doxygen/classrtk_1_1ElektaSynergyRawLookupTableImageFilter.html">ElektaSynergyRawLookupTableImageFilter</a> before.<br></div><div>Simon<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Sep 28, 2022 at 6:05 PM Alexandre <<a href="mailto:alexandrecafarofr@gmail.com">alexandrecafarofr@gmail.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 dir="ltr"><div>Hello all, </div><div><br></div><div>When I want to reconstruct a CBCT from Elekta XVI projections I can do the following, first define a geometry and then stack and process the .his projections, </div><div><br></div><div><p class="MsoNormal" style="margin:0cm 0cm 8pt;line-height:107%;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US"># Generate
geometry.xml<br>
os.system('./rtkelektasynergygeometry' +<br>
          ' --xml ' + fraction_folder +
'/_Frames.xml' +<br>
          ' --output ' + fraction_folder
+ '/geometry.xml')<br>
<br>
# Generate projection.mha<br>
os.system('./rtkprojections' +<br>
          ' --path ' + fraction_folder +
'/' +<br>
          ' --regexp .*.his ' +<br>
          ' --output ' + fraction_folder
+ '/projections.mha' +<br>
          ' --i0=' + i_0)</span></p><p class="MsoNormal" style="margin:0cm 0cm 8pt;line-height:107%;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">Do you know what is the preprocess of the projections with i0 ? </span></p><p class="MsoNormal" style="margin:0cm 0cm 8pt;line-height:107%;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">Log scale? clipping? </span></p><p class="MsoNormal" style="margin:0cm 0cm 8pt;line-height:107%;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">I would like to process the projections individually</span></p><p class="MsoNormal" style="margin:0cm 0cm 8pt;line-height:107%;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US">Thank you very much</span></p></div></div>
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