[Rtk-users] Gantry rotation direction and artefacts

[Vincent Libertiaux]

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