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 Rate This Message: http://www.cryonet.org/cgi-bin/rate.cgi?msg=17281