Discrete step remotely adjustable matching circuit for MRI RF co

Details Discrete step remotely adjustable matching circuit for MRI RF co Discrete step remotely adjustable matching circuit for MRI RF co

1996-02-09

1997-09-23

O'Shea, Sandra L.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

333 173, 1286535, G01R 3334, H01P 508, A61B 5055

Patent

active

056708815

ABSTRACT:
An RF coil tuning circuit is disclosed in which two banks of parallel capacitive branches are provided. Each capacitive branch includes a fixed value capacitor, a relay and a PIN diode connected in series. An impedance of the tuning circuit is adjusted to the optimum VSWR=1 condition by first switching the eight PIN diodes to learn which open/closed condition applies the fixed value capacitors in the optimum combination. Then, the PIN diodes are all closed and the optimum combination is applied using the open/closed states of the relays.

REFERENCES:
patent: 3906405 (1975-09-01), Kommrusch
patent: 4486722 (1984-12-01), Landt
patent: 4827219 (1989-05-01), Harrison
patent: 4890063 (1989-12-01), Haragashira
patent: 5221901 (1993-06-01), Decke et al.
patent: 5276411 (1994-01-01), Woodin, Jr. et al.
patent: 5463285 (1995-10-01), El-Aamamsy
patent: 5565779 (1996-10-01), Arakawa et al.

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