Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1986-08-06
1988-04-26
Levy, Stewart J.
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
324311, G01R 3320
Patent
active
047407522
ABSTRACT:
A quadrature detection magnetic resonance imaging (MRI) RF coil is constructed from non-overlapping axially-extending conductors arrayed about the circumference of a cylinder in four circumferentially spaced-apart groupings. Axially-extending annular gaps in the fingers (e.g, at their mid-points) are bridged across by RF coupling capacitors. The outer ends of the fingers are also coupled by annular conductors having one or more conductive gaps bridged by coupling capacitance. First and second quadrature detection RF input/output ports are coupled to at least one respective finger element in each of two adjacent groups of elements.
REFERENCES:
patent: 4594566 (1986-06-01), Maudsley
patent: 4602234 (1986-07-01), Butson
"Quadrature Detection Coils-A Further .sqroot.2 Improvement in Sensitivity" by Chen et al, J. Mag. Res. 54, 324-327 (1983).
"Quadrature Detection in the Laboratory Frame" by Hoult et al, Mag. Res. Med. 1 339-353 (1984).
"A Quadrature Probe for Adult Head NMR Imaging" by Sank et al, Department of Radiology, NIH, pp. 650-651.
"Radio Frequency Penetration Effects in MR Imaging: Simulation/Experiment with Linearly Polarized and Circularly Polarized RF Fields" by Glover et al, GE Medical Systems. pp. 264-265.
"An in vivo NMR Probe Circuit for Improved Sensitivity" by Murphy-Boesch et al, j. Mag. Res. 54, 526-532 (1983).
Arakawa Mitsuaki
Fehn John H.
Levy Stewart J.
O'Shea Kevin D.
The Regents of the University of California
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