<div dir="ltr"><div>Hi,</div><div>The ART algorithm uses one ray (one pixel of the projection) to update the volume. When all the pixels of one projection are used to update the volume, it's SART.</div><div>Check Kak & Slaney for more details:</div><div><a href="http://engineering.purdue.edu/~malcolm/pct/CTI_Ch07.pdf">http://engineering.purdue.edu/~malcolm/pct/CTI_Ch07.pdf</a></div><div>Simon<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Jan 14, 2021 at 6:37 AM Zhang, Zhehao <<a href="mailto:zhehao.zhang@wustl.edu">zhehao.zhang@wustl.edu</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">
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<p class="MsoNormal">Dear all,</p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">I am using the SARTConeBeamReconstructionFilter recently and it works well. Thanks for providing this helpful toolkits. I got one question when using this filter that there is one parameter called ‘m_NumberOfProjectionsPerSubset’. On your
website(<a href="http://www.openrtk.org/Doxygen/classrtk_1_1SARTConeBeamReconstructionFilter.html" target="_blank">http://www.openrtk.org/Doxygen/classrtk_1_1SARTConeBeamReconstructionFilter.html</a>), the description for it is Number of projections processed before the volume is updated (1 for SART, several for OS-SART, all for SIRT).</p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">According to my knowledge, if we update the volume each time when one projection was processed, shouldn’t it be ART algorithm? And all projections represents SART, several represents OS-SART. So I got confused about the description and
how SIRT was introduced here. Could anyone please give me some hints on how should I understand this? Thanks in advance.</p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Best regards,</p>
<p class="MsoNormal">Zhehao </p>
<p class="MsoNormal"><u></u> <u></u></p>
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