X-Message-Number: 17281
From: 
Date: Wed, 15 Aug 2001 14:21:34 EDT
Subject: Re: CryoNet #17220 Brain nano reading

From: Louis Epstein <>:

>I don't think that the nanoreading of a brain
>could be accomplished while the brain was
>still frozen,so I don't see how you can
>"upload" someone still in the LN2.

I think this is possible with magnetic resonance imaging. Medical MRI uses 
the wobbling of hydrogen atom in liquid water and don't work in frozen solid 
objects. There is a solution yet: The use of helium 3 atom polarized by a 
laser light. This is nearly 10 000 times more efficient than the 
electro-magnet polarization of hydrogen.

Current MRI resolution limit is near 0.1 mm and looking at brain structures 
may need a 1 000 times finer definition. The volume is so one billion times 
smaller and is the signal produced. Helium atoms will get back a 10 000 
factor, that let a short fall of 100 000. There enter into play the low 
temperature: Noise scale up as the fourth power of absolute temperature, if 
this one can be reduced from 300 K to 30 K , the signal to noise improve 10 
000 times. At 15 K the factor is more than 100 000 , what was requested to 
get the high definition scan.

In fact, high definition MRI is possible only at low temperature, even lower 
than LN2.


Y. Bozzonetti

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