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In: Technology
So aside from the really strong main field, the MRI needs to switch around really strong auxiliary magnetic fields to focus on what specific areas are being scanned.
Changing magnetic fields cause various metal bits to shrink and expand a bit, and the coils themselves also experience force that causes them to shrink/expand/shift a bit.
It’s the same reason transformers and power supplies hum and whine, just louder and with more interesting variation based on the scan pattern.
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