system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 why can’t they make a quiet MRI machine?
gpt
The forces involved inside an MRI machine are \*enormous\*. Part of the MRI scanner is a ludicrously powerful magnet, and another part creates a very rapidly changing electromagnetic field...the combination causes enormous forces & stress on the coils inside, causing them to expand and contract and make the "banging" noise we associate with MRIs.

The only way to stop it would be to somehow hold the coils so tightly that can't move \*at all\*. And the forces are too large for that to be practical. And if the forces weren't so large, the MRI wouldn't work.

It's kind of like asking why we can't make a quiet jet engine...we can make it quietER, but it's inherent to the machine that you're going to blow thousands of pounds of air through it at nearly Mach 1 and that just can't be silent. MRI is the electromagnetic version.