Emergency Table stop and Emergency power off

What is the primary function of the Emergency Power Off (EPO) button (also known as the Emergency Stop)?. To immediately collapse the magnetic field. To cut all incoming electrical power into the MRI system's computer and power distribution unit. To release the liquid helium into the atmosphere. To lock the patient table so it cannot be moved.

Does pressing the Emergency Power Off (EPO) button deactivate the MRI’s static magnetic field?. Yes, the magnet turns off instantly when power is cut. No, the magnetic field remains "always on" even without electrical power. Only if the button is held down for more than 30 seconds. It only turns off the magnet in "low field" systems.

In which situation is it appropriate to use the Emergency Power Off (EPO) button?. A patient is pinned against the bore by a metal oxygen tank. The patient is experiencing a panic attack. There is a fire or electrical sparkling coming from the computer or scanning room. The MRI technologist needs to restart the software for a routine update.

What is the purpose of the "Emergency Table Stop" or manual table release?. To quench the magnet during a patient emergency. To stop motorized movement and allow the patient table to be manually pulled out of the bore. To increase the speed of the table for faster patients’ entry. To restart the scan from the beginning.

Which button should be pressed ONLY if a person is pinned or impaled by a metallic object and their life is in danger?. Emergency Power Off (EPO). Table Stop. Emergency Magnet Stop (Quench Button). Scan Pause.

What physical process occurs during a "Quench"?. The magnetic field is reversed to push the metal object away. Electrical power is doubled to overcome the magnetic pull. Liquid helium is rapidly boiled off and vented outside to collapse the magnetic field. The scanner room is flooded with water to cool the magnet.

Why is a magnet quench considered a "last resort" action?. It is extremely expensive and carries risks like asphyxiation if venting fails. It deletes all patient data currently stored on the scanner. It takes over 24 hours for the magnetic field to disappear. It causes the MRI to become dangerously hot within seconds.

If the helium vent pipes fail during a quench, what is the most immediate danger to people in the room?. Electrical shock from the magnet coils. Asphyxiation due to helium gas displacing breathable oxygen. Loss of hearing due to the sound of the quench. Exposure to ionizing radiation.

Who is generally the only person authorized to authorize an emergency quench or EPO shutdown?. Any hospital security guard. The patient or their legal guardian. The MRI Technologist or Radiology Manager. The responding Fire Department captain.

What is the correct procedure if a patient has a cardiac arrest (Code Blue) inside the MRI bore?. Perform CPR inside the bore immediately. Quench the magnet to allow the crash cart to enter the room. Use the table release to move the patient to a safe area (Zone III) before starting resuscitation. Leave the patient in the bore and wait for the magnet to lose power naturally.