Why are MRI’s so loud?

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Just had an MRI. Why are they so loud? Additionally. I could decipher about 12 different “tones/noises.” What does that translate to ?

In: Technology
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The machine generates an enormous pulsing magnetic field. Almost everything in the machine is as non-magnetic as possible, but that’s not completely non-magnetic. Copper atoms, for example, react to strong magnetic fields. While the machine is quite sturdy, any possible flex will cause motion. Moving innards makes sound. The forces are large enough that you can hear the sound.

Here is an opened machine working , showing WHY it is so loud…[https://www.youtube.com/watch?v=pLajmU4TQuI](https://www.youtube.com/watch?v=pLajmU4TQuI)