[Rtk-users] Issues with displaced detector filter when running FDK inline with acquisition

[Simon Rit]

Hi Nick,
I stopped caring about the inline application and removed it as it did not
seem to be used... One of the things that has been developed is a new
weighting scheme for offset detectors, see doi.org/10.1118/1.4945418. In
this filter, you cannot specify the minimum and maximum offsets manually:
https://github.com/SimonRit/RTK/blob/master/include/rtkDisplacedDetectorForOffsetFieldOfViewImageFilter.hxx#L81-L89
Things should be different with the previous version
https://github.com/SimonRit/RTK/blob/master/include/rtkDisplacedDetectorImageFilter.hxx#L130-L149
Can you try this version instead? I have opened an issue to track this
problem:
https://github.com/SimonRit/RTK/issues/509
Simon

On Mon, Sep 19, 2022 at 12:17 PM Nick Staut <nick.staut at smartscientific.nl>
wrote:

> Hi everyone,
>
>
>
> I’ve been trying to use RTK to run a reconstruction during acquisition
> which runs without issues and returns an acceptable result if I disable the
> displacedDetectorFilter. However, when I try to enable the displaced
> detector filter before getting sufficient projections (+ more importantly
> for the ddf: geometry entries) I get the following error:
>
> “ITK ERROR: Cannot account for too large detector displacements, a part of
> space must be covered by all projections.”
>
>
>
> I saw that the old rtkinlinefdk implementation (from RTK v1.4 after which
> it seemed discontinued) manually set the minimum and maximum offsets to the
> displacedDetectorFilter, however if I do the same now it still fails.
>
>
>
> To provide a reproducible example I recreated the rtkinlinefdk application
> following the original format (with small modifications to mimic what I do
> in my code these modifications are mentioned at the comment at the top of
> the cxx file). I attached all required files for the example application to
> the e-mail, it should just compile if you recompile RTK with this unzipped
> folder in you application directory. Once I understand the issue with the
> displaced detector filter I could also create a pull request for this rtk
> application if this is considered useful.
>
>
>
> Kind regards,
>
> Nick
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