<div dir="ltr"><div>Hi Yannick,<br>Yes, that's correct. It should not be too difficult to implement, at least on the CPU, now that we have <a href="https://github.com/SimonRit/RTK/blob/master/code/rtkProjectionsRegionConstIteratorRayBased.h">iterators with the geometry</a>, but I still haven't done it. In practice, I do a pseudo parallel geometry when I need one by setting a large distance between the source and the detector.<br></div><div>I'll post a message on the mailing list when the real parallel geometry is implemented.<br></div>Simon<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Jun 20, 2017 at 3:08 PM, Yannick BOURSIER <span dir="ltr"><<a href="mailto:boursier@cppm.in2p3.fr" target="_blank">boursier@cppm.in2p3.fr</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi all,<br>
<br>
In an old archive (March 2013), it was announced that only rtkfdk was working correctly with a parallel beam geometry (defined by artificially setting the SourceToDetectorDistance to 0.).<br>
<br>
It seems that it is still not possible to execute forward and backward projections with such a geometry, is it true, or did I miss something ? I've just checked all the archives without finding any clue about that problem.<br>
Could you help me please ?<br>
<br>
Thanks in advance,<br>
Best<br>
<span class="HOEnZb"><font color="#888888">Yannick Boursier<br>
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