Hi Simon,
thank you for the reply and the link. I realized that I forgot the extra
sid/sdd factor in my computation.
I wish you a pleasant day,
Vincent
On 21.02.24 10:50, Simon Rit wrote:
Hi Vincent,
This is a problem we have investigated before. Check figure 1 of this
article <https://aapm.onlinelibrary.wiley.com/doi/10.1002/mp.16869>.
If only the detector moves, it must be limited to 50% to have the
center of rotation in the beam. If both move, the motion should be
limited to 50% of the detector size times the inverse of the
magnification ratio (0.5*detsize*sid/sdd).
I guess the error message is a bit misleading?
Simon
On Tue, Feb 20, 2024 at 5:20 PM Vincent Libertiaux <v...@xris.eu> wrote:
Hello RTK gurus,
I have a question about half beam CT. I performed a simulated CT
with a
detector displaced by half of its width and everything went
smoothly. I
got a nice reconstruction.
I then ran the same simulation but moved the object rather than the
detector this time (for practical reason, it is more likely to
happen in
our real xray shots). In the rtk geometry, I imposed proj_iso_x and
source_x to be the same value, thus modelling a displacement of
the object.
Unfortunately, I get a ITK ERROR: Cannot account for detector
displacement larger than 50% of panel size.
The detector displacement is the same in both cases, so I can only
assumes the problem comes from shifting both the source and the
detector ?
Did I do something wrong ?
Thank you in advance for any help !
Best regards,
Vincent
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