Local antenna with homogeneous sensitivity for a nuclear magneti

Details Local antenna with homogeneous sensitivity for a nuclear magneti Local antenna with homogeneous sensitivity for a nuclear magneti

1992-11-10

1994-05-31

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324322, G01R 3320

Patent

active

053172663

ABSTRACT:
A local antenna for transmitting and/or receiving radio frequency signals in a nuclear magnetic resonance imaging apparatus includes first and second sub-antennas which are axially spaced from each other. The sub-antennas each are composed of at least one conductor turn. An electrical series circuit is formed of the first sub-antenna, a capacitive element for shortening the path length effective for the radio frequency signal and of the second sub-antenna. The two sub-antennas have the same winding direction. A capacitor is connected in parallel with the series circuit. The respective capacitance values of the series capacitive element and the parallel capacitor are approximately the same. For constructing a local antenna system especially suitable for mammography, two such local antennas are arranged side-by-side and are electrically connected in parallel. The series capacitive elements of the two local antennas face each other.

REFERENCES:
patent: 4733190 (1988-03-01), Dembinski
patent: 5006805 (1991-04-01), Ingwersen
patent: 5065760 (1991-11-01), Krause et al.
patent: 5144244 (1992-09-01), Kess
"Hochfrequenzsysteme fur die Kernspintomografie," Durr et al., ntzArchiv vol. 11, No. 5 (1989) pp. 237-242.

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