Matched guadrature coils for MRI with minimized intercoil coupli

Details Matched guadrature coils for MRI with minimized intercoil coupli Matched guadrature coils for MRI with minimized intercoil coupli

1986-02-10

1987-09-22

Noland, Tom

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324309, 324322, 336223, 333 24C, G01R 3320

Patent

active

046958010

ABSTRACT:
First and second co-located axially extending RF coils are displaced spatially with respect to one another by 90 degrees so as to produce a pair of RF signals from the enclosed volume which are in phase quadrature. The same coils or one of them may also be utilized for transmitting NMR RF signals into the same volume. The coils have a common open-end through which objects to be imaged may be inserted and a common "closed" end for convenient location of RF coupling and feeding structures. Each of the coils has an RF feedline structure which extends across a diameter of common closed end and the two feedline structures are disposed substantially perpendicular with respect to one another so as to minimize cross coupling. The feedlines are also spatially configured to facilitate mounting of associated tuning and coupling capacitors. A fixed coupling "paddle" provides cancellation coupling between the coils and a movably mounted coupling paddle is arranged to provide variable amounts of cancellation coupling between the orthogonal feedline structures. The phase quadrature RF signals emanating from the pair of coils are preferably amplified before being combined in a 90.degree. RF hybrid circuit.

REFERENCES:
patent: 4297637 (1981-10-01), Crooks et al.
patent: 4318043 (1982-03-01), Crooks et al.
patent: 4471305 (1984-09-01), Crooks et al.
patent: 4607225 (1986-08-01), Crooks
"Quadrature Detection Coils-A Further .sqroot.2 Improvement in Sensitivity" by Chen et al, J. Mag. Res. 54, 324-327 (1983).
"Quadrature Detection in the Laboratory Frame" by Hoult et al, Mag. Res. Med. 1 339-353 (1984).
"A Quadrature Probe for Adult Head NMR Imaging" by Sank et al, Department of Radiology, NIH, pp. 650-641; by Feb. 1986.
"Radio Frequency Penetration Effects in MR Imaging: Simulation/Experiment with Linearly Polarized and Circularly Polarized RF Fields" by Glover et al, GE Medical Systems, pp 264--265; by Feb. 1986.
"An in vivo NMR Probe Circuit for Improved Sensitivity" by Murphy-Boesch et al, J. Mag. Res. 54, 526-532 (1983).

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