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Microcap & Penny Stocks : FONR...Patent on Cancer Detection....
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To: daveG who wrote (373)3/14/1997 2:40:00 PM
From: James L. Fleckenstein   of 560
 
Super cons traditionally required liquid helium and liquid nitrogen to keep them cold enough; the former is very expensive and the latter is cheap. To get superconducting materials up to the temp that nitrogen alone would be sufficient is therefore a big deal in the superconducting sciences. Nowadays, this issue is compensated for by having one time fills or biannual fills of cryogens being all that is necessary. Non supercons are cheaper to operate but they tend to be heavier, which produces siting difficulties. Image quality is primarily a function of signal to noise ratio (SNR). The more signal you have the smaller the pixels can be and therefore the sharper the image. Magnetic field homogeneity is also important because artifacts dominate when homogeniety lessens. Supercon vs resistive by themselves have no effect on image quality.
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