Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1997-12-23
1999-12-28
Arana, Louis
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
324322, G01V 300
Patent
active
060086491
ABSTRACT:
RF coil apparatus is provided for use in an MR imaging system, wherein the B.sub.0 field is oriented in a specified direction. The apparatus comprises a coil structure positioned in selected relationship with the B.sub.0 field, the coil structure comprising a pair of elongated coil members in spaced-apart parallel relationship, and a selected number of lateral coil members positioned along the elongated coil members in spaced-apart parallel relationship with one another. A number of first capacitive elements, each of a first capacitance, are selectively positioned along the elongated coil members, and a second capacitive element is included in each of the lateral coil members, each of the second capacitive elements being of a second capacitance. A first coupling network operates the coil structure to selectively transmit and receive a first RF field component directed along a first axis which is orthogonal to the B.sub.0 field direction, the first RF field having a frequency determined by a specified relationship between the first and second capacitances. In like manner, a second coupling network operates the coil structure to selectively transmit and receive a second RF field component directed along a second axis which is orthogonal to both the B.sub.0 field direction and the first axis, the second RF field component having a frequency likewise determined by the relationship between the first and second capacitances, the first and second capacitances being respectively selected so that the frequencies thereof are equal.
REFERENCES:
patent: 4928064 (1990-05-01), Keren
patent: 5153517 (1992-10-01), Oppelt et al.
patent: 5235277 (1993-08-01), Wichern
Boskamp Eddy B.
Tropp James
Arana Louis
Cabou Christian G.
General Electric Company
Price Phyllis Y.
Skartsen James O.
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