What are all the different types of noises that an MRI makes when you’re getting a scan? And why is it different noises every few minutes?
In: Technology
The noise is caused by the vibration of metal coils inside the machine. Inside an MRI is a big magnet and large coil of wire. To take a 3D picture, the high power coils pulse on and off. Energizing a coil of wire creates a magnetic field. This field is SO powerful that it causes the actual wire to vibrate. During a scan the coils are rapidly switched on and off, creating a loud pulsing sound.
During a scan the control computers modify the signals sent to the coils. A faster pulse for example will likewise sound quicker in pace. I am not an MRI tech, but I assume the different signals modify the properties of the image.
Have you ever heard the low hum of large electrical transformers / equipment? The same principle applies.
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