[Rtk-users] Simulating geometric error on detector

[Simon Rit]

Hi,
There are three rotations to chose the orientation of the detector:
GantryAngle, InPlaneAngle and OutOfPlane. Any orientation can be set. If
you want a slant around the detector center, then a change in the
GantryAngle will imply a change in SourceToIsocenter, SourceToDetector
(both measured in the direction orthogonal to the detector) and
SourceOffsetX / ProjectionOffsetX. The geometry documentation should help:
http://www.openrtk.org/Doxygen/DocGeo3D.html
If you mind find it to set one detector position by setting the source
position, detector origin position and the u and v axes. See all the
different versions of AddProjection in the doxygen
<http://www.openrtk.org/Doxygen/classrtk_1_1ThreeDCircularProjectionGeometry.html>
.
Best regards,
Simon

On Fri, Nov 25, 2022 at 10:21 AM 김창환 <gameboy514 at gmail.com> wrote:

> Dear all,
>
> I am now generating the simulation data with geometric distortions on the
> detector, by using RTK.
>
> Translation can be easily implemented by adjusting the parameters
> (proj_iso_x and proj_iso_y).
> However, for the rotation, it seems that there are only two parameters I
> can manage. (in_angle and out_angle).
> Thus, at this moment, tilt and skew are available to implement, but for
> the slant, it seems that there is no such way.
>
> Please let me know if there is any way to implement rotation about one
> other axis.
>
> (Image from Wang, Zhao, et al. "Improvements in micro-CT method for
> characterizing x-ray monocapillary optics." *Optics Communications* 504
> (2022): 127474.)
>
> [image: image.PNG]
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