MRI Scanner Ramp Up Zaps iPhones!

drrjv

macrumors newbie
Original poster
Jun 25, 2006
4
0
I work in a medical facility where there is an MRI scanner that was being ramped up (magnet turned on.) During this time period at least 8 people in the office had their smartphones killed. One person also lost an Apple Watch and another Apple Watch crashed but restarted.

Our theory, with the help of our medical physicist, is that during the 'ramp up' process, an electro-motive force was created that sent a strong surge of power into the phone's inductive coil, even though most of the employees were 20 to as far as >100 feet away from the scanner. While the MRI magnet may be shielded and the 5 gauss line is within the scanner room, this only applies when the magnet is fully ramped. The shielding is unbalanced while it is ramping resulting in a dynamically changing magnetic field which can induce crazy currents.

Only phones with inductive coils and wireless charging were affected.
 

mritech

macrumors regular
Jul 29, 2015
175
82
I’m an MRI tech and I’ve never heard or seen this personally besides online like this. But this is the first mention of the “wireless charging phones only” but when our magnet was re-ramped up there was a galaxy 8, my iPhone 8 and maybe another 8 around and we were fine
 

drrjv

macrumors newbie
Original poster
Jun 25, 2006
4
0
I’m an MRI tech and I’ve never heard or seen this personally besides online like this. But this is the first mention of the “wireless charging phones only” but when our magnet was re-ramped up there was a galaxy 8, my iPhone 8 and maybe another 8 around and we were fine
You're lucky. May be a sporadic issue. Best advice: turn off smartphones (especially those with wireless charging) and put in a metal box or car when ramping the magnet.
 
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