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[Spridgets] 7 MRI's

Subject: [Spridgets] 7 MRI's
From: bjshov8 at tx.rr.com (BJNoSHOV8)
Date: Wed, 05 Jan 2011 19:05:22 -0600
References: <566256F4F5A547C6998F0A3E3093F40E@spider> <C948EA1E.2CC90%billyzoom@billyzoom.com> <946E985D33764FF8AC06544DB15BA154@spider> <4D23B5B3.2020902@justbrits.com> <EAB93ADCBC4C47B2804A41B1D67C66B4@spider> <B6E0FC0C-8CA5-44A4-9411-25846E13C537@mac.com>
The "tube" machine that I was in at our local hospital made a lot of 
noise.  It did make banging noises, as if large internal components were 
moving and stopping rapidly.  It wasn't a highly repetitive noise but 
happened every minute or so, in between all the various hums and so 
forth.  I'm not sure why sudden reversal of polarity would cause 
displacement of air, unless the mechanical parts were moving along with it.


> As I understand it, the noise comes from the reversing of the polarity of the 
> magnet. It is not really any physical movement, just a sudden reversal of the 
> polarity causes a rapid displacement of the air inside, causing a shock wave, 
> also known as sound. I may be off in that analysis, but it is pretty close.

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