Subject: Re MRI - possible long term health effects (Joyce)(Teule).
Date: Sun, 17 Sep 2000 102830 -0500
From: Roy Beavers
To: guru
--------------------------------------------------
.........Response from EMF-L......
-------- Original Message --------
Subject: Re: MRI - possible long term health effects (Joyce)...
Date: Sun, 17 Sep 2000 13:22:13 +0200
From: teule
Reply-To: teuleger@wxs.nl
To: roy@emfguru.com
References: <39C4719B.B6516718@emfguru.com>
Hello Kelly,
I was strugling with the question about MRI (Magnetic Resonance Imaging) some
time ago and I had some kind of a "fight" with people from a scientific magazine. They
wrote that MRI works with magnetically equalizing the atoms nuclei and than
the nuclei are bombarded with radiowaves. In the proces the atom nuclei send out
radiowaves, that can be registered. A computer program (tomography) than
constructs te visual image of the brain.
My question to them was, how they make a difference between the artificial
introduced EMR effects and the original brain EMR effects. The whole process
sounds to me like listening to the singing of a small bird, next to a at full
power roaring Boeing 747. At first the people of the magazine were very helpfull. Than
they send me away to the scientific literature and finally it appeared
that they did not know the answer. fMRI (Functional MRI, a more sophisticated technology)
shows areas with the most oxigen consumption. Those areas are
considered to be the most active. Obviously the MRI and fMRI give nice pictures
of brain structures and activities, but it only says that things are happening
"somewhere there", i.e. still millions of neurons are taken together. We are
still far away from "understanding" our brain activity.
PET (positron-emmission tomography) does the same, but the pictures give less
detail compared to fMRI.
EEG (Electro-encephalography) measuers the electrical brain activity (the
rhitmic oscillation of neurons) without adding EMF from outside.
MEG (magneto-encephalography) does the same bij measuring het magnetic
vibrations.
Very promising, but not yet fully developed.
(see also "Mapping the Mind", Rita Carter)
I still have doubts about the MRI, especially the "bombardment" with radiowaves.
Is there anyone who knows the frequencies and measured effects? I remember the
work from von Klitzing, where EMR from a DECT telephone system generates brain activity,
that lasts long after the telephone conversation has stopped. Is that
also true for MRI? Or is this some kind of close-by-radar to make brain pictures? Both
explanations do not sound very healthy.
By the way. Viewing a foetus via ulra high sounds is something comparable. Anyone
who knows the reactions of the foetus?
Gerrit Teule
Netherlands
Roy Beavers wrote:
> ...............From EMF-L........
>
> The following question (forwarded to our website) has been the subject of
> discussion in past years...... I'm sure there is some coverage of the topic
> in our archives. But, it probably deserves attention again..... Anybody have anything
> new to say on the subject??? I assume the questioner is implicitly
> asking about possible long term health effects......???......guru.....
>
> >
> >
> > ------------------------------------------------------------------------------------------
> >
> > Subject: MRI
> > Date: Thu, 14 Sep 2000 08:34:21 -0400
> > From: joycekg
> > To: webmaster-guru@emfguru.com
> >
> > Hi, I am doing some research on MRIs (Magnetic Resonance Imaging) and am
> > wondering if you have any info on the safety of this technology and/or how
> > MRIs relate to other emf technologies like TV, radio, powerlines.
> >
> > Thanks,
> > Kelly Joyce
> > joycekg@bc.edu
>
> --
>
> Roy Beavers (EMFguru)
> roy@emfguru.com
>
> It is better to light a single candle
> than to curse the darkness.....
>
> WEBSITE: http://emfguru.com
>
> People are more important than profit$$
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Reprinted with permission of Roy Beavers, http://www.emfguru.com