I know that you tend to be balls deep in American Exceptionalism, but the truth is that reasonable countries with reasonable health care average 15-30 MRI machines per million inhabitants.

America is a wild outlier, and unless you have data to back that those machines are put to good use, I'd trust the rest of the world who decided the sweet spot is 15-30 mer million, not 60.

This statistic appears to have flown directly over your head. It is not an illustration of how awesome the United States is. The overprovision of MRIs in the US drives costs in a variety of ways; one of the most obvious is that routine imaging for things like back pain leads directly to things like spinal fusion surgeries, which don't work.

The gap between Canada and the United States is immense. Canada could add quite a large number of machines and not come even within the line of sight of where the US is.