What are the best strategies to obtain good simulation CT imaging for prostate cancer patients who have had hip replacements?  

For bilateral hip replacements, I have obtained/fused a cone beam CT as it often does not have as much artifact, and also fused an MRI with the cone beam image.

I would imagine that MRI image registration is probably the most accessible method to help delineate target volumes in the setting of bilateral hip replacements.  There are also commercially available algorithms available to suppress metal artifact like O-MAR (Metal Artifact Reduction for Ortho...