Magnetic resonance apparatus having a quadrature RF coil system

Details Magnetic resonance apparatus having a quadrature RF coil system Magnetic resonance apparatus having a quadrature RF coil system

1989-04-11

1990-06-05

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324322, G01R 3320

Patent

active

049317342

ABSTRACT:
A quadrature mode rf coil system in a magnetic resonance apparatus includes a pair of orthogonal rf coils which, for excitation and/or detection are coupled to an rf source or receiver by an electronic switching circuit built up from inductances and capacities. The switching circuit includes preferably frequency adjustable 90.degree. first delay lines feeding each coil which transforms the 50.OMEGA. coil impedance of each coil to 100.OMEGA. so that the parallel combination of transformed impedances is 50.OMEGA.. A second 90.degree. delay line is cascaded with the first delay line feeding one of the coils to establish a 90.degree. phase difference between the coils.

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M. O. Leach; The design and use of a dual-frequency surface coil providing proton images for improved localization in .sup.31 P spectroscopy of small lesions; Medical Physics, vol. 13, No. 4, Jul./Aug. 1986.
C. N. Chen. et al., "Quadrature Detection Coils--A Further 2 Improvement In Sensitivity", Journal of Magnetic Resonance, 54, 324-327, (1983).

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