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?

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