There are locked doors with badges pretty much everywhere in a hospital in my country though (including the door leading to the ER, and the escalator which goes

There are locked doors with badges pretty much everywhere in a hospital in my country though (including the door leading to the ER, and the escalator which goes from the ER to the ICU, in my city's hospital), so I don't really understand what would prevent to put such a door at the entrance of the MRI room.