It would be interesting to compare the results of AI + 1 radiologist to 2 radiologists (and with a larger sample, to AI + 2 radiologists). Does the AI add a useful perspective? Does the AI perspective add enough that it's a better backup check than a radiologist? If not, does it add anything to a pair of radiologists, since it would presumably be fast and cheap and so it would still be a good outcome to add it into the process.

Another interesting question, if you had unlimited resources for studies: how does AI compare to 1 or 2 poorly trained 3rd world radiologists?