What action should be taken immediately in the event of a quench?

In the event of a quench, the immediate priority is to ensure the safety of all individuals in or around the MRI room. A quench occurs when the superconducting magnet loses its superconducting state, causing the cryogens (usually liquid helium) to rapidly evaporate and create a release of gas that can displace oxygen. This can lead to a potentially dangerous environment.

Removing the patient and anyone else from the room is crucial because the gas released during a quench can create a hypoxic atmosphere, risking loss of consciousness or other hazards. Quick action in evacuating individuals helps prevent injury or worse outcomes associated with a reduction in breathable air.

While calling for emergency assistance, turning off the MRI machine, or activating the fire alarm are important steps that might follow, the primary focus needs to be on immediate removal of individuals to ensure their safety. Therefore, the correct response emphasizes the urgent need to clear the area to avoid exposure to potentially harmful conditions arising from the quench.