@Linkat,
Plus I dont think that the answer to the original question is known. Not enough effort has gone into study, and the picture appears to be complicated.
1) we love to get treated with high tech the more expensive the better devices for several reasons
2) defensive medicine
3) In America MRI and CT machines are high profit to build and per use charges
4) doctors and medical companies like to show off that they have high tech, the more expensive the better
5) America has the most machines per capita other than Japan, and when you have it you gotta use it
6) people now have this fetish with trying to live as long as possible, and they tend to want to use all advantages to get there
7) I am fairly certain that owners of scan machines get very pissy when they dont have high utilization rates for a few reasons, all of them to do with money, and so they pressure providers to send more patients.
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I am glad Boomer still likes us enough to tell us about stuff like this.