How to implement digitally reconstructed radiograph (DRR) in python

Question

Looking for reference code, preferably in python for generating an XRAY from CT.

This should model as much of the following factors:

• Attenuation (LUT)

• Focal point

• XRay beam shape and angle

• XRay energy (keV)

I am already familiar with the following options and looking for something better then:

1. volume.sum(1) (assuming volume is a numpy 3d array)
2. MeVisLab supports what I'm looking for but does not allow for simple python integration without installing all of the > 1 GB software.
3. VTK has some examples (1, 2) but they don't show working with LUT for simulating attenuation.
4. There's this ITK example, but its in c++ and I suspect that it too works using mean intensity projection rather then simulating attenuation.