From: Brian Atkins (brian@posthuman.com)
Date: Thu Apr 26 2001 - 12:44:57 MDT
John Clark wrote:
>
> Brent Allsop <allsop@fc.hp.com> Wrote:
>
> >Our ability to scan at ever increasing resolutions is increasing just
> >like computer power and everything else isn't it?
>
> Existing MRI machines are good enough for an upload, but you'd have
> to be very patient. If a machine has a constant signal to noise ratio then
> the scan time increases to the 6th power of the resolution. If it took you
> 1 second to get 1 mm resolution it would take 10^28 years for 1 nanometer.
> The strength of a magnetic resonance signal depends of how sharply it varies
> in space, so resolutions of a few nanometers can and has been achieved in a
> reasonable time by bringing the sample close, very, very, close to the magnet,
> unfortunately to do this the sample must be microscopic.
>
There have been recent advances in MRI resolutions using quantum coherence
effects:
http://www.princeton.edu/~wwarren/NMRintro
-- Brian Atkins Director, Singularity Institute for Artificial Intelligence http://www.singinst.org/
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