Most Medical Imaging Devices Run Outdated Operating Systems

Having worked in that 'biz' I would say this is true but a feature, not bug.

Any complex system like that is certified to operate within parameters given a specific set of equipment, software revisions and the like. Figuring out the implications of OS upgrades (much less vendor-supplied software or hardware -- even non-electronic parts) is difficult enough as it is. This applies not only to patient-facing imaging equipment but various lab equipment as well.

Such equipment should not be connected to a network of course, but that is not implied as a problem in this blog post.