Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1986-11-26
1988-09-06
Levy, Stewart J.
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
G01R 3320
Patent
active
047696052
ABSTRACT:
In a quadrature antenna coil assembly of a magnetic resonance imaging system, the antenna coil assembly having a first receiver coil and a second receiver coil and having external coupling between the first and second receiver coils, a coupling cancellation network has a first set of terminals connected across the first receiver coil, a second set of terminals connected across the second receiver coil, and circuitry, connected between the first and second terminal sets, for generating additional coupling between the first and second receiver coils in opposite polarity and equal magnitude to the external coupling to cancel the external coupling.
REFERENCES:
patent: 3603871 (1971-09-01), Caunter et al.
patent: 4695801 (1987-09-01), Arakawa et al.
Blume, R. L., "u-Mode Balancing Method for Crossed-Coil Nuclear Magnetic Resonance Rf Head," Rev. Sci. Instr. 33(2), Dec. 1962.
Journal of Physics E, vol. 8, No. 8, pp. 632-633 (Aug. 1975), R. R. Lembo, V. J. Kowalewski "Leakage Balance System for Crossed Coil NMR Probes".
The Review of Scientific Instruments, vol. 19, No. 7, pp. 435-439, Martin E. Packard, "A Proton-Controlled Magnetic Field Regulator", Jul. 1948.
Fess Lawrence
Kabushiki Kaisha Toshiba
Levy Stewart J.
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