[roentgen]

You make some good points.

Of course, I cannot prove that the tests insure quality. In fact, this is not what the radiology board exam does.

The board exam is designed to weed out dangerous doctors, which is probably the best we can hope for. So, I guess you can take my word for it or not, but dropping the bar at all would let dangerous people practice, which I see as a mistake. The people that I know who failed the exam should not be working in Radiology.