[Rtk-users] Gantry rotation direction and artefacts

[Simon Rit]

Mirror in which direction? Depending on the direction, it can also be a
180° offset of the angle. If it reconstructs well, I would assume that the
direct direction is the correct one but there is something else you need to
understand...

On Fri, Aug 28, 2020 at 10:44 AM Vincent Libertiaux <vl at xris.eu> wrote:

> Hi Simon,
>
> thank you for testing my dataset.
>
> I get the same results you describe and I am quite happy with the first
> result. However, the reconstructed volume is a "mirror" view of the real
> object, and my guess was that the rotating plate was going in the opposite
> direction assumed by rtk. Is it the wrong assumption?
>
> Thank you again for your help,
>
> best regards,
>
> Vincent
>
>
> Thanks for the dataset. When I run
>   rtkfdk -p . -r ^proj.mha$ -g direct.xml --spacing 0.5 -d 300 --hardware
> cuda -o fdk.mha
> The result looks good to me. Obviously, when I run
>   rtkfdk -p . -r ^proj.mha$ -g inverse.xml --spacing 0.5 -d 300 --hardware
> cuda -o fdk.mha
> the result is bad since the correct rotation direction seems to be the
> direct one. Did you expect the second line to produce the correct result?
> Or is the first line not producing a good enough result in your opinion?
>
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