[Rtk-users] Gantry rotation direction and artefacts

[Simon Rit]

Hi Vincent,
This sounds like a typical geometry problem. It's hard to guess what could
be the problem without data. Is it a system for which you're able to
reconstruct in the opposite direction?
Simon

On Thu, Aug 27, 2020 at 2:17 PM Vincent Libertiaux <vl at xris.eu> wrote:

> Dear RTK users,
>
> I am trying to reconstruct a volume using the opposite rotation
> direction; I basically defined my rotation angle to be -360 degrees and
> my initial angle to be 359.6 (I have 900 projections).
>
> The results present artefacts, mostly important blurs compared to the
> "original" reconstruction.  To be sure I was not misinterpreting the way
> rtk deals with the geometry, I performed the same reconstruction with
> the "direct" rotation direction (from 0 to 359.6) but reordering my
> projections instead, which yields in the same blurry results.
>
> I feel I am missing some basic understanding of what is happening, any
> help you can provide would be much appreciated !
>
> Best regards,
>
> Vincent
>
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