[Rtk-users] Forward and Back projections in 3D parallel geometry

[Simon Rit]

Hi Yannick,
Yes, that's correct. It should not be too difficult to implement, at least
on the CPU, now that we have iterators with the geometry
<https://github.com/SimonRit/RTK/blob/master/code/rtkProjectionsRegionConstIteratorRayBased.h>,
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.
I'll post a message on the mailing list when the real parallel geometry is
implemented.
Simon

On Tue, Jun 20, 2017 at 3:08 PM, Yannick BOURSIER <boursier at cppm.in2p3.fr>
wrote:

> Hi all,
>
> 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.).
>
> 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.
> Could you help me please ?
>
> Thanks in advance,
> Best
> Yannick Boursier
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