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 > > _______________________________________________ > Rtk-users mailing list > rtk-us...@openrtk.org > https://www.creatis.insa-lyon.fr/mailman/listinfo/rtk-users > >
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