10 ms·
Magnetic field != gradient of magnetic field. Changes in fields induce currents, you can stop your heart or cause seizures with enough currents in the wrong pl
by nullc 5y ago
Magnetic field != gradient of magnetic field.
Changes in fields induce currents, you can stop your heart or cause seizures with enough currents in the wrong places.
Field from a magnet falls off with the inverse cube of distance... so "I was somewhere near an insanely powerful magnet" isn't really saying much.
In an MRI you're probably more likely to see effects of heating from the excitation RF-- which is multiple kilowatts of UHF for 1.5T magnets, and scales with the field strength.
- ta988 5y agoYes the pulsed fields can definitively cook you. It is often a limiting factor in saturation experiments (used to hide a signal in a sample to increase dynamic range) that increases experimental time. I've seen solvents boiling in samples analyzed in NMR magnets. And it usually messes up your experiments way before that anyway because temperature make some of the signals shift in the spectrum you acquire.