[Rtk-users] Offset detector with ADMM - hole in centre

[Simon Rit]

Hi,
I don't have much experience with ADMM. However, in my experience with the
conjugate gradient algorithm, it's worth weighting the least squares cost
function with the redundancies at the center.  This has been documented by
others, see e.g.
https://doi.org/10.1088/0031-9155/58/2/205
This seems to be implemented in ADMM as well, have you tried to set
DisableDisplacedDetectorFilter to true?
Simon

On Fri, Oct 11, 2019 at 9:00 AM Korte James <James.Korte at petermac.org>
wrote:

> Hi,
>
>
>
> I am having issues with an artifact (black hole in the centre) in my ADMM
> reconstructions when using an offset detector. I have tested the same
> projection set and geometry file with the FDK algorithm and the
> reconstruction is fine.
>
>
>
> I’ve previously been using the same workflow with a centred detector, with
> no issues, for both the FDK and ADMM reconstruction methods.
>
>
>
> Are there any known issues/common pitfalls with the ADMM implementation
> and detector offsets?
>
>
>
> Cheers,
>
> James
>
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