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| boron |
Posted - Mar 26 2008 : 6:59:13 PM
I understand how an MRI works. However when I was lookin up why it makes noise I found this:
"The technique of MR imaging employs magnetic fields called gradient fields that are used to determine the location of signals generated in the MRI process. These powerful gradient fields are switched off and on at a very fast rate and the result is a banging sound."
Why does a field being turned on and off make noise? Is it the circuit being used to turn them on and off like the clicking of a relay? Or is it caused by some weird phenomena of the gradient field?
While were on the subject of fields, I understand according to quantum theory why objects can have magentic properties, due to the spin (paired or unpaired) of electrons, protons and neutrons. I also understand that radio waves and other forms of electromagnetic radiation photons can be emmited from exited electrons as they jump orbitals. However what I don't get is how electronic circuits (such as transmitters) are capable of producing radio waves, microwaves, etc.
How is an electric current capable of energizing more electrons to "jump" and force them to produce the radiation?
Any insight would be great.
Thanks
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| 2 L A T E S T R E P L I E S (Newest First) |
| BEatonNo1 |
Posted - Sep 04 2015 : 01:08:10 AM
I would guess the noise is from the force of the magnetic fields on the coils causing movement. Like a humming transformer. |
| zinovyev |
Posted - Jun 24 2015 : 05:01:32 AM
Unfortunately I don't know what's wrong with your MRI, but I know what should you do if you want to buy/to sell MRI or another medical equipment.
Maybe it will help you:) There's the link for selling MRI: http://bimedis.com/search/search-items/mri
Bimedis.com
Medical Equipment Marketplace, convenient to both buyers and sellers.
Large quantity of brand new and used medical equipment with the detailed technical data and prices. |
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