MRI machines are loud, but can they damage your hearing?
|
Andrew Stewart
|
Jul 29, 2024
If you have ever had an MRI you know the machines can be quite noisy. In fact the average noise level in an MRI can vary from about 83 to 118 decibels, depending on the machine used. For comparison here are noise levels and the maximum safe exposure time:
Noise Level | Maximum Exposure Time per 24 Hours |
85 | 8 hours |
88 | 4 hours |
91 | 2 hours |
94 | 1 hour |
97 | 30 minutes |
100 | 15 minutes |
109 | 112 seconds |
112 | 56 seconds |
124 | 3 seconds |
As we can see, at 110 decibels, hearing damage can occur after about 1-2 minutes unprotected. The maximum amount of protection you can get with foam inserts is between 25 and 30 decibels. This means that in an average machine you should be able to get the volume down to 80 to 85 decibels with properly inserted plugs.
The key is proper insertion: make sure you squeeze the foam plug tightly and place if deep into the canal to get the best possible protection. Custom hearing protection will ensure that you get a proper fitting each time you put the plugs in.
So what is the verdict? Can MRI’s cause hearing loss? Looking at the sound level produced by these machines, the answer is that there is potential for hearing loss if your ears are unprotected. With hearing protection the level would be reduced to a safe level for the amount of time you are in the machine. Fortunately, hearing protection is often provided at the appointment. If you are not sure, it might be worth asking before your appointment. If plugs are not provided then it is advisable that you bring your own hearing protection when going in for the MRI.
For more information on hearing and noise please contact Accurate Hearing at one of our convenient locations:
Lower Sackville: 902-252-3004
Cole Harbour: 902-406-4327
