X-Message-Number: 27635
Date: Mon, 20 Feb 2006 02:19:55 EST
Subject: Uploading technology (1.i.3) Brain reader steps 1.

Uploading technology (1.i.3) Brain reader steps 1.

Some  years ago, I have described 3 potential technologies able to read the 
brain  information content. 

The more powerful was a CAT X-ray system  using quantum nondemolition. The 
main drawdack was the request for X-rays with  very long coherence length, 

something produced only with nuclear laser, a "Star  War" technology at least. A
fusion device seems in order to produce the nuclear  excited states. Another 

solution would be using high order entangled photon  either as a pump system for
the nuclear laser or directly as the imaging beam.  We are far from having the 
components of such systems off the shelf, so only  preliminary subsystems 
could be produced now.
The second system was a microwave intensity interferometer. This is too a  

purely research avenue, the first problem is to produce the millimeter wave in a
 coherent way. This may be done as a modulation in an infra-red laser diode 
of  the Bragg resonator kind. The microwave is produced as an interference in 
the  Bragg grating section of the diode. Such devices are not "on the shelf" 

either,  they must be ordered as ASIC (Application Specific Integrated Circuit)
and the  cost is at least three order of magnitude above run of the mill 

electronics  components. Because the frequency produced rests on the diode 
value,  this one must be stabilised at one part per million at least. This too 
ask for  special purpose elements not largely distributed, particularly for 
people not  working for industry in the defense sector. 

My advance in  this domain is that I have the diode and its controler, I need 
now to build the  detector before doing the experiment. The next element to 

produce will be a  coincidence detector running in the THz domain, not a simple
task either. After  that, it will be possible to look at an imager using this 

The third system used Magnetic Resonance Imaging  technology. MRI scanner are 
in large use, but brain reading need a very special  breed of them. Some 

peculiarities are: High resolution, working at cryogenic  temperature, chemical

analysis capability and so on. For uploading, the brain  reader information must
be converted into data able to be loaded in an  electronics device. This 

picture reader is not a simple system and must be  produced for this particular

The first picture producer  will be so designed to feed the picture reader, 
even if it get its picture in a  way not suitable for brain reading. My choice 
for that step is a microscope  using hyperpolarized He3 MRI and working on 

freeze dryed sample. The intricate  structure of freeze dryed objects reduce the
gas mobility and so allows a better  resolving power. On the other side, the 
large surface produces a fast  depolarisation (short T1, the spin-network 
depolarisation time). This is haf a  drawback, the final system will work at 

cryogenic temperature on solid elements  with a similarly short T1, so it 
at room temperature what will be  encountered at lower ones.

Current MRI systems work at room  temperature with equilibrium magnetisation, 
this one is inversly proportional to  the absolute temperature, at 300 K it 

is on the order of one part per million,  so the signal is very weak. In liquid
neon, near 30 K it is ten times better,  this could be a good second step for 
the MRI technology, it could for example  map the cracks produced by the low 
temperature. The MRI radiowaves produce a  heating effect near .1 degree C, 

this would limit cooling at near .3 deg. C and  would bring magnetisation in the
.1 percent range. The hyperpolarised gas is in  the tens of percent range, on 
the other side, its density is at least two order  of magnitide lower than 

what can be found in solid compounds. All in all, the  signal is so in the same
order range and this gas technology is so a good test  for the true system, at 
least for what is linked to T1 and signal  power.

My current objective is to build a gas hyperpolariser  for closed cells. Next 
will be an open cycle polariser and then the MRI  microscope with the freeze 
dryer. The laser producing the polarising beam and  the magnetic system have 
been built, the nuclear magnetic resonance detector is  is on the work bench, 
the optical part is the next and final step. To my  knowledge, on the order of 
a dozen of laboratories in the world are mastering  this technology, so it is 
a big task for a simple amateur, even without looking  at following  steps.


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