While I don't know if it is feasible or not, radiology interpretation can be done in units of one scan or a series of scans, and would easily sustain $1 per minute. The high price is caused by a combination of unique skill set, regulatory capture by the Guild Of Right Honoroable Radiologists, and agency issues separating the person who benefits from the interpretation, the person who orders the interpretation, and the person who pays for the interpretation.