Why does the MRI scanner make so much noise?
The tapping and knocking noise you hear during your scan is caused by magnetic coils that switch on and off during the scan. These coils measure the signal coming from your body in order to make the images that are used for your diagnosis. Because these coils are switched on and off rapidly, they vibrate and cause the noise your hear. Since these noises are often very loud, the technologist will give you some type of hearing protection.
