They act just like residents. They read out with the attending before dictating reports.
I believe the role will be limited. There is certainly potentially a role for the PAs in IR clinics and wards (in departments that admit to IR). But this is more of a traditional clinical PA role, dealing with simple medical issues on wards, seeing patients in the clinic and other routine medical tasks like the traditional PA model, not really radiology-specific and would obviously be quite limited.
There was some initial enthusiasm for using them in gastric procedures but as we all know, the volume of these has dropped significantly, in addition many groups have simply trained their regular RTs to do these. In interventional, only a few types of procedures are appropriate for delegation (i.e. thoras, paras MAYBE simple bx) and the radiologist has to be nearby in case there is a problem These are quick procedures anyway we can whip off between cases. And somehow even here it often doesn't feel right to delegate as many of these can be done without imaging, presumably the clinician sent them to us in radiology because of technical difficulty, coagulopathy etc, so it seems unreasonable to then go and delegate these cases to someone less trained that the referring MD! And PICCs are already done by regular techs and RNs.
What abut interpretation? Well this has been discussed at high levels in the radiology community and the bottom line is that in North America there is NO WAY radiologists will be delegating image interpretaiton to mid-levels. Sure, you could have several PAs working as residents and dictating or transcribing reports with VR, but unlike residents, the PAs will not be doing independent call. Since they also will not "graduate" into BC radiologists, there is actually little real benefit over, say, a secretary. (Plus when you and a resident miss something, you can blame the resident, and still have some credibility with other doctors
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So while I see potential in a few select areas I do not anticipate a significant role. To me this is borne out by the fact that while there has been much talk over the past 5-10 y about PAs in radiology we come across very, very few!