[Rtk-users] Forward projection rotation matrix from gantry and couch angles

[pmkclnl at yandex.ru]

Dear developers,

For DRR image calculation i use a ThreeDCircularProjectionGeometry class 
with AddProjection method. The default rotation direction is around 
Y-axis in LPS coordinates (Z-axis in RAS coordinates in 3D Slicer) as i 
understand from the documentation. Should i calculate rotation matrix 
manually (using gantry, in-plane, out of plane angles) and then use 
AddRotationMatrix method to simulate movement of gantry angle around the 
Y-axis in RAS coordinates (and couch angle rotation around Z-axis in RAS 
coordinates)? Are there any other options to setup a required axis of 
rotation of the gantry?

Best regards,

Mikhail