4 ms·
why doesn't the MRI machine do magnetic field checks to make sure there isn't some anomalous metal anywhere near it - and do near instant shut down if so?
by throwmeaway222 1y ago
why doesn't the MRI machine do magnetic field checks to make sure there isn't some anomalous metal anywhere near it - and do near instant shut down if so?
- kccqzy 1y agoBecause shutting down and restarting it is a >$10,000 event.
- ars 1y agoIt can't shut down fast. You can only shut it down by boiling away the liquid helium, and all the energy of the magnet turn into heat to boil it. It's a slow process. There is an enormous amount of energy in that magnet which has to go somewhere.
- throwmeaway222 1y agoI wasn't aware of the slow shutdown. Perhaps the companies that sell or install them need to start stating it will need double the amount of room: The room where it is installed and a room where you pass through to get to it. The pass through room can check your magneticness before it unlocks the door. There is always a solution.
- ars 1y agoThey already do that. The exact setup varies, but it's most often a metal detector you have to go through at the door with an alarm.