This is very interesting (from Strategy and Business)

There is substantial evidence that overutilization and misuse of technology leads to spending that exceeds its value for patients. In the diagnostic imaging technology category — which has grown to nearly a $100 billion business — spending increases are driven to a large extent by the growth in the number of machines installed in hospitals, as well as in doctors’ offices and at imaging centers. This has led in turn to overcapacity in many areas and has created incentives for doctors to prescribe unnecessary procedures. Duplication of procedures (i.e., a patient receives an MRI, then a PET scan, even though doing both procedures does not help doctors get closer to a diagnosis) and overuse of high-end procedures in situations where they add little value has also driven up technology spending unnecessarily.

This needs more research.