Magnetic resonance imaging apparatus having a detuned RF coil

Details Magnetic resonance imaging apparatus having a detuned RF coil Magnetic resonance imaging apparatus having a detuned RF coil

1987-06-08

1988-11-29

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324318, G01R 3320

Patent

active

047885033

ABSTRACT:
In magnetic resonance imaging apparatus in which bird-cage coils are used in combination with other coils, a capacitance is bridged by means of an inductive element. Substantial detuning and hence adequate uncoupling of the bird-cage coil from the other (receiving) coil is achieved. Use can be made of the already present coaxial transmission line via which the RF energy is applied to the bird-cage coil. Connecting the core and the jacket of the coaxial transmission line there is arranged a diode switch so that the bird-cage coil circuit can be electronically detuned, thus enabling fast switching on and off of the bird-cage coil.

REFERENCES:
patent: 4517516 (1985-05-01), Hill
patent: 4612505 (1986-09-01), Zijlstra
patent: 4638253 (1987-01-01), Jaskolski
patent: 4641097 (1987-02-01), Bottomley
patent: 4649348 (1987-03-01), Flugan
patent: 4691163 (1987-09-01), Blass
patent: 4692705 (1987-09-01), Hayes

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