You might be interested [in this recent Reddit post](https://www.reddit.com/r/mechanical_gifs/comments/iy4ej9/a_ct_scanner_at_full_speed_without_the_cover/?utm_source=share&utm_medium=ios_app&utm_name=iossmf) that shows a CT scanner running at full speed without its cover on. There is lots of information about these and MRI scanners in the comments, including an explanation about the sounds.
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