Ridecamp: Re: [RC] magnetics

The flyback is what presents the problem with the MRI. The flyback of 
the magnet produces the greatest time variance in the field. The FDA - 
and forgive me if I get the number wrong since it's been awhile since I 
worked on this - requires that the peak rise in blood temp is less than 
one degree. Hence the flyback speed is limited. That's why it takes so 
long for an MRI - at least using magnets that flyback. There are better 
ways to do it than using a flyback but the processing of the data is 
beyond the computer horsepower affordable by most users.  If you 
released the flyback to be arbitrary speed you would cook the patient.

I just don't know what effect stationary magnets might or might not 
have. And I doubt anyone else does. Maybe they have some effect and 
maybe they don't. Some of the greatest minds in physics - Newton for 
example swore light was a particle. He was proved wrong when Fernel, 
Maxwell, etc. showed beyond a shadow of a doubt that it was a wave. Only 
to find out as explained later by Einstein ( for which he won the Nobel 
prize in physics) that is a truly a particle and a wave.

Do stationary magnets do anything - maybe yes maybe no.  But I do know 
that there are many MD's and DVM's that believe they do based on 
experience. Experience fuels intuition which fuels speculation which is 
the fodder of expanding the knowledge of science. So for me I'll keep my 
mind open.

Truman


ridecamp-owner@xxxxxxxxxxxxxxxxx wrote:

> MRI (Magnetic Resonance Imaging) places a human body into a very high pulsed
> magnetic field to render a visual image of the internal structures.  This
> process - in use since the 1980's - has proven to be totally safe.
>
> You will note that no one who has received an MRI has ended up with five
> arms or six ears or any other subtle or significant change in their
> physiology.  If the pathetically weak static magnets (an MRI is millions of
> times more powerful) used in these consumer magnetic products had a material
> affect on the body, then in all probability, an MRI would be fatal, or at
> least severely debilitating.
>
> I'd use all of those lovely and shockingly expensive "therapeutic" static
> magnets for captivating the imagination of children as they play with iron
> fillings on a piece of paper...
>
> Mike Sofen
>
> -----Original Message-----
> From:  Truman Prevatt
> Subject: Re: [RC] [RC] shoes reopened...NOT; now magnetic boots
>
> A time varying  magnetic field will cause a current in a conductor -
> this is how a generator works. The blood is a conductor and hence you
> will get a current and resulting heat in from a time varying magnetic
> field.  This would probably promote circulation.
>
> A static magnetic field has no such effect no matter the strength. The
> magnets you put on are stationary magnets - unless of course they have a
> battery involved or the unit plugs into the wall. However, a stationary
> magnetic field will deflect a stream of charged particles passing
> through it. The blood stream is a moving stream of charged particles.
> Does this have an effect on circulation. I sure don't know.
>
>
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