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.
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