RF coil coupling for MRI with tuned RF rejection circuit using c

Details RF coil coupling for MRI with tuned RF rejection circuit using c RF coil coupling for MRI with tuned RF rejection circuit using c

1986-02-10

1987-07-21

Nussbaum, Marvin L.

Wave transmission lines and networks

Transmission line inductive or radiation interference...

324318, 324322, 333176, 333185, 333207, H03H 701

Patent

active

046821252

ABSTRACT:
Undesirable RF coupling via the outside of an outer coaxial cable conductor to/from RF coils in a magnetic resonance imaging apparatus is minimized by employing a parallel resonance tuned RF choke in the circuit. The choke is realized by forming a short coiled section of the coaxial cable with a lumped fixed capacitance connected in parallel thereacross and a conductive tuning rod positioned within the center of the coiled section so as to trim the parallel resonant frequency to the desired value.

REFERENCES:
patent: 2104916 (1938-01-01), Evans
patent: 2227846 (1941-01-01), Rust
patent: 2419907 (1947-04-01), Mole
patent: 3538463 (1970-11-01), Pakan
Murphy et al-"Balanced Matching in vivo NMR Probes for Improved Sensitivity", Society of Magnetic Resonance in Medicine, Second Annual Meeting, California, Aug. 16-19, 1985, Proceedings; pp. 248-249.
"The Radio Amateur's Handbook", 1976, published by The American Radio Relay League; pp. 579-580.

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