There was always a CT scan machine, as far back as early 2006, the difference was in the type of scanner. There was a two-slice scanner in 2006 that evolved to a two-slice and a sixteen-slice—that refers to the speed at which it can scan. An MRI machine showed up in 2011 from the U.S. Navy, but it was purely for research, strictly for research in mild traumatic brain injury.
On March 27th, 2013. See this statement in context.