Typically, X-Ray and EEG rooms are located in sub-basements where cell service is next to non-existent, so you are fighting an uphill struggle. Here, in PA, all X-Ray and EEG rooms are conduit fed for everything. So, assuming there is a conduit in the room for a corded telephone, you could possibly install another cable for a cell phone extender. I had a similar situation at a UPMC hospital and I was able to get an extender from Verizon. I have no idea what it cost because UPMC made the arrangement with Verizon and all we did was install the cable and ceiling mount antenna.

Rcaman

Americom, Inc.
Where The Art And Science Of Communications Meet