I had a Brain MRI last Feb… I was not even home before the loudest hissing started. I called my insurance nurse and she said it happens to some people, but should not remain. Mine is HORRIBLE 10 1/2 mo’s later accompanied with head tremors, constant Tinnitus and extremely serious Vertigo! I had some hearing loss before and have had new tests which show hearing loss, but I have not compared the two tests. (New test from 2023 and old from 2015) I have learned a couple of lessons from all my research and the most important is that I will live with these constant problems for the rest of my life…Most likely the cause was the lack of responsibility at the Radiology Clinic I went to. Hearing protection is absolutely necessary, but the ear plugs MUST be used correctly! The sponge plugs rolled up pencil size so they can fit tightly in your ears! Ear muffs are also an added protection. My radiologist handed me the foam earplugs and said, “Put these in your ears!” No guidance regarding proper use! Everyone or most people have some occasional “ear ringing,” but my LOUD constant “hissing” developed AFTER my MRI! It is worse at night disrupting my sleep and costing me co-pays to see specialists! Forgot to mention with a Brain MRI, you may end up with more damage due to the closeness of the machine to the ears!