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.

I think this one might not be true anymore. Canada has 432 machines as of ~2023 (340 in 2015) and MA is on the order of ~300 (can't find exact figures). It's still a lot lower per capita (10.8 per million vs 42 per million).