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Magnetic resonance imaging , medical uses

The helium supply seemed secure, but then scientists discovered a whole new application for the gas. Helium boils at the lowest temperature of any substance (-269°C) and it never solidifies. Liquid helium is therefore the ideal substance to cool electrical wires and reduce their resistance to the flow of the current. It has allowed us to manufacture superconducting magnets, which have diverse applications, but probably none more useful than in magnetic resonance imaging. This technology affords doctors a noninvasive look inside the human body, and it Is probably the most important medical diagnostic tool ever developed. The future of mri, however, hinges on the availability of helium. Think about that the next time you fill those birthday balloons with the gas. [Pg.211]

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