Not an ER physician, but as a paramedic that spent a lot of time in the ER, it depends. Code 3 trauma/medical calls would generally have portable XR brought to the ER room, waiting for our arrival with the patient. In those cases, the XR is taken in the room, not in the DI (diagnostic imaging) wing, and generally the interaction flow will be "XR sent by wifi to radiologist elsewhere, who will then call the ER room and review the imaging live, or very quickly thereafter (i.e. minutes)", because of the emergent need, versus waiting for report dictation/transcription.