Circularly polarizing local antenna for a nuclear magnetic reson

Details Circularly polarizing local antenna for a nuclear magnetic reson Circularly polarizing local antenna for a nuclear magnetic reson

1992-08-24

1993-08-31

Arana, Louis

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324322, 1286535, G01V 300

Patent

active

052412725

ABSTRACT:
A local antenna system for generating and receiving circularly-polarized, high-frequency magnetic fields in a nuclear magnetic resonance imaging apparatus has two coil groups disposed to define an examination volume therebetween, with each coil group having two coils therein, with each coil having a middle axis disposed at an angle substantially less than 90.degree. relative to the middle axis of the other coil in that group. The coil groups are disposed relative to the examination volume so that each coil in a coil group has a diagonally disposed counterpart coil in the other coil group. When the diagonally coils are respectively fed with currents which are phase-shifted by 90.degree. relative to each other, they respectively generate circularly-polarized high-frequency magnetic fields in the examination volume which are in-phase. In a reception mode, the signals induced in the diagonally disposed coils are superimposed in-phase.

REFERENCES:
patent: 4506224 (1985-03-01), Krause
patent: 4594566 (1986-06-01), Maudsley
patent: 4766383 (1988-08-01), Fox et al.
patent: 4767933 (1988-08-01), Hanawa
patent: 4816765 (1989-03-01), Boskamp
patent: 4879516 (1989-11-01), Mehdizadeh et al.
patent: 5006805 (1991-04-01), Ingwersen
patent: 5144239 (1992-09-01), Oppelt et al.

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