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Hi again,<br>
<br>
Sorry for my answer, I realized that I was wrong and was about to
write you again about it. Indeed, one can identify groups of
parallel rays outside the central slice, but their source ends up
off the circular trajectory by the cone angle, and then it's hard to
imagine what to do with such data.<br>
<br>
Turbell seems to describe a solution to that, and T-FDK's results
look interesting in his PhD thesis. I only discovered it with your
email, so I cannot say anything about it. Can you elaborate on the
problem you are trying to solve and the reasons why you need T-FDK
instead of FDK ? <br>
<br>
Regards,<br>
Cyril<br>
<br>
<div class="moz-cite-prefix">On 12/28/15 14:30, niloufar teyfouri
wrote:<br>
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<div>Thanks dear Cyril<br>
</div>
But I have read the grass' paper titled "3D cone-beam CT
reconstruction for circular trajectories" and Turbell have
explained this method ( T-FDK) in his PhD thesis "Cone-Beam
Reconstruction Using Filtered Backprojection" . I want to
implement DFR in 3D cbct, so I need rebinning it. Grass have
done this in his paper. I would be happy if you say your idea
about it.<br>
<br>
</div>
Best<br>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Mon, Dec 28, 2015 at 1:23 PM, Cyril
Mory <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:cyril.mory@uclouvain.be" target="_blank">cyril.mory@uclouvain.be</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF"> Hi Niloufar,<br>
<br>
There is no such program in RTK, and you won't find it
anywhere else. What you are asking for is impossible. <br>
In 2D fan-beam, rays can be sorted into groups of parallel
rays, because they are indeed parallel to each other.<br>
In 3D cone beam along a circular trajectory, the rays
outside the central slice cannot be sorted into groups of
parallel rays : they just aren't parallel. <br>
<br>
Hope that helps.<br>
<br>
PS : The more I think about it, the more I think there
must be some connection between the possibility of
re-binning to parallel projections and Tuy's data
sufficiency condition. If someone has a clear
understanding of this area, I'm curious about it.
<div>
<div class="h5"><br>
<br>
<div>On 12/18/2015 08:43 PM, niloufar teyfouri wrote:<br>
</div>
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<div>Hi Dear RTK users<br>
<br>
</div>
Do you know a program in RTK for rebinning the
3D circular cone beam ct projections on the flat
panel detector to parallel beam projections?<br>
<br>
</div>
I would be appreciate, If you could help me.</div>
<br>
<fieldset></fieldset>
<br>
</div>
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-- <br>
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<div dir="ltr"><font face=""><font size="1"><b
style="color:rgb(0,51,51);font-family:arial,helvetica,sans-serif"><span
style="background-color:rgb(255,255,255)">Niloufar.Teyfouri,
<br>
PhD candidate of biomedical engineering,<br>
</span></b></font></font><font size="1"><b
style="color:rgb(0,153,0);font-family:arial,helvetica,sans-serif"><span
style="color:rgb(0,51,51)"><font face="">Isfahan
University of Medical Sciences,</font></span></b></font><font
size="1"><span
style="color:rgb(0,51,51);font-family:arial,helvetica,sans-serif"><font
face=""> Isfahan, Iran<b>.</b></font></span><b
style="color:rgb(0,153,0);font-family:arial,helvetica,sans-serif"><span
style="color:rgb(0,51,51)"></span></b></font><font
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style="color:rgb(0,51,51)"></span><a
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style="background-color:rgb(255,255,255)"></span><font
face=""><span
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style="color:rgb(0,51,51);background-color:rgb(255,255,255)"></span><br
style="color:rgb(0,51,51);background-color:rgb(255,255,255)">
<span style="background-color:rgb(255,255,255)"><span
style="color:rgb(0,51,51)">email</span>:<a
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href="mailto:bioniloofar@yahoo.com"
rel="nofollow" target="_blank"><a class="moz-txt-link-abbreviated" href="mailto:bioniloofar@yahoo.com">bioniloofar@yahoo.com</a></a></span></font></b></font></div>
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