MRI or magnetic resonance imaging machines are used to create detailed images of various body parts and enable us to see anatomy and physiological processes. These machines use strong magnetic fields and are never turned off. Here’s why!
The main reason why these huge machines cannot be turned off is because of the strong magnet present inside them.
This magnet comprises superconducting coils that are cooled to extremely low temperatures with liquid helium.
If the machine is turned off, the magnet will lose its superconductivity and heat up, boiling the liquid helium.
This can lead helium to escape the magnet, which can not only damage the machine but also can be extremely dangerous.
To ensure this doesn't happen, the machine always remains on, although its power may be reduced when not in use.