A radiologist practicing in the USA can live anywhere in the world, but they must be trained in the USA, licensed in the state(s) where they read from, credentialed at the hospitals or facilities they read from, and carry medical malpractice insurance.
The point being, hospitals can't throw cheap Indian or Filipino radiologists at the worklist.
Not sure about other countries, but RAs do outsource work to RRAs(1) and then sign the final product. This is relatively new as Medicare/Medicaid didn't recognize RRAs as mid-level practitioners until 2019. I suspect the answer is yes for ARRT-certified RRAs, but it will be state-specific (similar to the answer above about RAs).
