Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1984-08-16
1987-01-06
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
324318, G01R 3320
Patent
active
046349804
ABSTRACT:
A nuclear magnetic resonance radio frequency coil. The disclosed coil provides high frequency resonance signals for perturbing a magnetic field within the coil. The coil is impedance matched and tuned with adjustable capacitors. A balanced configuration is achieved with a co-axial cable chosen to phase shift an energization signal coupled to the coil. The preferred coil is a thin metallic foil having a shorting conductor, four wing conductors, and uniquely shaped parallel cross conductors connecting the shorting and wing conductors. When mounted to a rf transmissive plastic substrate and energized the coil produces a homogeneous field within a region of interest the size of a patient head. A semicircular balanced feedbar arrangement is used to minimize undesired field contributions.
REFERENCES:
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patent: 4384255 (1983-05-01), Young
patent: 4408162 (1983-10-01), Egger
patent: 4454474 (1984-06-01), Young
Engle, "Broadband Transmit/Receive Circuit for NMR," Rev. Sci. Instrum., 49(9), (Sep. 1978) pp. 1356-1357.
Moores, "VHF Pulsed Magnetic Resonance Duplexers," Rev. Sci. Instrum., vol. 42, No. 9, (Sep. 1971) pp. 1329-1333.
Holland G. Neil
Lillo Aarne
Misic George J.
Patrick John L.
Picker International Inc.
Tokar Michael J.
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