If the radiologist has to look at and double check every scan that algo looked at, then what is the point of the algo? Seems like a useless middleman that get in the way.
There have been studies showing significant improvement from double-reading mammo, for example (i.e. two radiologists, independently). Using an ML approach is trying to give you some or all of this benefit without the cost of redundant reads.
The point is that the algorithm can improve results. This isn't ad placement, it's peoples' lives. Checking and double checking should be the norm.