On 11.05.22 15:15, Simon Rit wrote:
Hi,
Yes, I think it's correct. To be sure you correctly understand it, you
can always do test cases with the source and detector positions, u v
vectors in the coordinate system of your object.
http://www.openrtk.org/Doxygen/classrtk_1_1ThreeDCircularProjectionGeometry.html#a0fb1475ed76a28cde24fac85eae18e1e
and then check the resulting angles and distances.
Simon
On Wed, May 11, 2022 at 2:15 PM Vincent Libertiaux <v...@xris.eu> wrote:
On 10.05.22 22:54, Simon Rit wrote:
> Hi Vincent,
> RTK can parametrize any orientation of the detector with the three
> angles GantryAngle, InPlaneAngle, OutOfPlaneAngle. 0.025° seems
very
> small indeed! I don't know how much you know about software B
but the
> easiest would be to have either the projection matrix or the source
> position, detector position, u axis and v axis in patient/object
> coordinates to derive the RTK parameters.
> Good luck with this!
> Simon
Hi Simon !
Unfortunately, I don't have access to B projection matrices.
As for the detector orientation in RTK, I have made this picture
to make
sure I understand properly how to use the gantry angle to achieve my
desired geometry:
https://ibb.co/J3H8z9M
The cyan detector is the default configuration with a 0° gantry
angle.
The blue detector is at a gantry angle of alpha (largely
exaggerated for
the sake of clarity). So in order to simulate an out-of-plane
rotation
of the detector around its vertical axis, I should translate this
blue
detector so that its center matches the coordinates of the cyan
one, and
translate the source accordingly (along the black vectors on the
picture) ? I assume that proj_iso_x/y and source_x/y are
expressed in
the gantry system of coordinates (local) ?
Thank you again for your feedback,
kindest regards,
V.
Thanks Simon,
I'll investigate more and let you know. Hopefully, it might be useful
to someone else one day !
V.
_______________________________________________
Rtk-users mailing list
Rtk-users@public.kitware.com
https://public.kitware.com/cgi-bin/mailman/listinfo/rtk-users
