High impedance differential input preamplifier and antenna for MRI
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United States of America Patent
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Mar 23, 2010
Grant Date -
Oct 23, 2008
app pub date -
Sep 11, 2006
filing date -
Sep 9, 2005
priority date (Note) -
Expired
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Abstract
Antenna assemblies for magnetic resonance signals comprise a non-resonant loop antenna and a high impedance differential amplifier. The amplifier can include first and second high electron mobility transistors that have gates coupled to an antenna loop that is defined on a rigid substrate. The non-resonant loop has an effective length of less than about 1/10 of a wavelength of a signal to be detected. Arrays of such loops can be defined on the rigid substrate, and HEMTs for the loops secured to the substrate.
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