Volume RF coils with integrated high resolution focus coils for

Details Volume RF coils with integrated high resolution focus coils for Volume RF coils with integrated high resolution focus coils for

1997-12-12

1999-12-07

Arana, Louis

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

600421, G01V 300

Patent

active

059989998

ABSTRACT:
A magnetic resonance imaging apparatus includes a main magnet (12) for generating a main magnetic field in an examination region (14) and a radio frequency coil assembly. The radio frequency coil assembly transmits radio frequency pulses into the examination region (14) to induce magnetic resonance in selected dipoles disposed therein. The radio frequency coil assembly also receives signals from selected resonating dipoles. The radio frequency coil assembly includes a birdcage coil (60) having a plurality of conductive elements (64) constructed on a dielectric form positioned about the examination region (14). The birdcage coil (60) includes a plurality of capacitors (C1-C24) and corresponding plurality of series connected diode inductor pairs connected in parallel with each capacitor to form resonant trap circuits. The radio frequency coil assembly also includes at least one focus coil (62a-c) having a conductive loop placed on a thin dielectric layer attached to the birdcage coil (60) such that the focus coil (62a-c) is electrically insulated from the birdcage coil (60). The focus coil includes a plurality of capacitors connected in series and corresponding plurality of series connected diode inductor pairs connected in parallel with each capacitor.

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