Interesting. Thanks for sharing, Pablo.
I notice a useful chart at Appendix 3 at your third link:- "2013 Life Expectancy Guide Compared with Other Guidelines". It displays life expectancy for common imaging equipment according to various sources.
To my mind, those life expectancy years are a little on the low side. For instance, it seems that the US Army only expects an MRI Scanner to last five years.
The table on page 13 is also interesting, as it indicates life expectancies set against equipment utilisation (number of patient examinations, etc.).
