Room temperature superconductors. Liquid nitrogen superconducters exist for sale today. Liquid nitrogen is cheaper than beer.
A Wallmart thermos is adequate.
In terms of the main magnetic field, you don't need superconductors until you get up to well over 1T. This is because ... whatever you gain in signal, you lose to noise. Permanent magnets work just fine... and they don't generate much noise.
Early in the history of medical MRI's... about the time that it was predicted that a State the size of Illinois would need 6 units... the Scandinavians... forget exactly which ones... demonstrated whole body MRI using .05T main fields. I almost bought one...
but didn't think I could survive in a fairly sleazy competitive environment.
Superconductors are also used for gradients but that is a tough app and very expensive.
On the other side of the question, every time someone mixes superconductors and MRI, they learn something new about superconductors and fields. Super conduction is still an open field (no-one is claiming the definitive theory) and imaging is certainly a viable way to approach this field, since the cost of the basic research can be offset by a huge medical. But then you would have to work for a fairly large company and be the best available... for everyone else, this isn't an option.
There are enough issues having to do with magnetic resonance phenomena that I have never really become interested in the
issues surrounding super conduction... but I can certainly understand the interests.
The main problem with MRI is the expense... much of which is related to patents and intellectual property.
The other issue is the cost for someone who would simply like to study the area. Such people really do need some kind of unit to play with.
As far as I could tell... the number of MRI units available to publicly funded medical facilities in East Africa... can be counted on part of one hand. So, there is a huge need.
What could be done... using a PropII ... or even a PropI would be to put some really low cost units together for students...
and then hope that some of them would take the next step and take the commercial plunge in their own countries.
Who is going to produce MRI units for Africa?
... if it isn't Africans, it simply won't happen. The Propeller is perfect, because you start with a clean slate and no-one is going to sue you for patent infringement... if you do it right[noparse]:)[/noparse]
I believe so... but what you might have been looking at in the video·is the result of what happens when you sum two sine waves together that have·the same frequency but a different·phase.· The·result is the same·as controlling the amplitude.
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IC Layout Engineer
Parallax, Inc.
Comments
A Wallmart thermos is adequate.
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JMH
Sorry... thought you were pulling my leg.
In terms of the main magnetic field, you don't need superconductors until you get up to well over 1T. This is because ... whatever you gain in signal, you lose to noise. Permanent magnets work just fine... and they don't generate much noise.
Early in the history of medical MRI's... about the time that it was predicted that a State the size of Illinois would need 6 units... the Scandinavians... forget exactly which ones... demonstrated whole body MRI using .05T main fields. I almost bought one...
but didn't think I could survive in a fairly sleazy competitive environment.
Superconductors are also used for gradients but that is a tough app and very expensive.
On the other side of the question, every time someone mixes superconductors and MRI, they learn something new about superconductors and fields. Super conduction is still an open field (no-one is claiming the definitive theory) and imaging is certainly a viable way to approach this field, since the cost of the basic research can be offset by a huge medical. But then you would have to work for a fairly large company and be the best available... for everyone else, this isn't an option.
There are enough issues having to do with magnetic resonance phenomena that I have never really become interested in the
issues surrounding super conduction... but I can certainly understand the interests.
The main problem with MRI is the expense... much of which is related to patents and intellectual property.
The other issue is the cost for someone who would simply like to study the area. Such people really do need some kind of unit to play with.
As far as I could tell... the number of MRI units available to publicly funded medical facilities in East Africa... can be counted on part of one hand. So, there is a huge need.
What could be done... using a PropII ... or even a PropI would be to put some really low cost units together for students...
and then hope that some of them would take the next step and take the commercial plunge in their own countries.
Who is going to produce MRI units for Africa?
... if it isn't Africans, it simply won't happen. The Propeller is perfect, because you start with a clean slate and no-one is going to sue you for patent infringement... if you do it right[noparse]:)[/noparse]
Rich
*Run your house on 12V with out needing 3 Aught wiring.
*Computers with no noise running parallel buses in the high GHz
...
does this mean we will get control over not only frequency and phase, but also the Amplitude?
exciting stuff...
tubular
I believe so... but what you might have been looking at in the video·is the result of what happens when you sum two sine waves together that have·the same frequency but a different·phase.· The·result is the same·as controlling the amplitude.
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Beau Schwabe
IC Layout Engineer
Parallax, Inc.