[Rtk-users] Gantry rotation direction and artefacts

[Vincent Libertiaux]

Hi Simon,
not only it is clear but it is also spot on !
Thank you very much for your help once again.

Best regards,
Vincent
> On 28.08.20 14:13, Simon Rit wrote:
>> Thanks for the illustration. Maybe the detector is not oriented as 
>> intended by RTK? If you look at the first drawing of the geometry doc 
>> <http://www.openrtk.org/Doxygen/DocGeo3D.html>, I would question the 
>> direction of the vector v. You can probably just flip it to put it in 
>> the right direction? e.g. with
>> rtkfdk -p . -r ^proj.mha$ -g direct.xml --spacing 0.5 -d 300 
>> --hardware cuda -o fdk.mha --newdirection 1,0,0,0,-1,0,0,0,1 
>> --neworigin -140,151.6,0
>> which comes down to flipping the y axis after reconstruction without 
>> the last two options. I think that the RTK coordinate system becomes 
>> indirect if you flip this v axis which is probably ignored by your 
>> visualization tool. I admit I realized only recently that I often 
>> reconstruct data which are like this.
>> I hope I'm clear, if not that's probably because I don't master so 
>> well all this...
>> Simon
>

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