not too many pa's going into radiology. those that do are generally former xray techs and do mostly interventional. I reviewed the RPA website and it looks like the only difference between an rpa and an appropriately trained pa in this setting is that the pa can write for procedural sedation as needed and the rpa can not.also if something goes wrong, the pa knows how to evaluate and treat medical patients and the rpa does not. for instance a pt who has an mi in the rad suite. the pa could interpret the ekg, intubate, run the code, etc while most rpa's do not have this ability. rpa's probably will replace most rad pa's because they will be much more affordable due to their training being limited to radiology. most rad pa's probably make 80k+ per year and I expect rpa's make less than that.best of luck with your practice.-e