From my experience (~5 years working as a PCA in a cardiovascular imaging and catheterisation lab), upgrades to large imaging equipment and such is scheduled th

From my experience (~5 years working as a PCA in a cardiovascular imaging and catheterisation lab), upgrades to large imaging equipment and such is scheduled throughout the year according to the lease plan, and these companies (i.e. Siemens) work together with the OS providers and know full well when operating systems are scheduled to be upgraded. However you're exactly right, it's got to be left specifically to the Siemens tech who comes out to work on the machine. (Bit of a moot point in agreement, but thought I'd share my 2c)