Method for matching antennas in a nuclear magnetic resonance ima

Details Method for matching antennas in a nuclear magnetic resonance ima Method for matching antennas in a nuclear magnetic resonance ima

1991-11-06

1993-05-04

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324318, G01R 3320

Patent

active

052085376

ABSTRACT:
In a method for matching a transmission/reception antenna in a nuclear magnetic resonance imaging apparatus to the impedance of a high-frequency system which feeds the antenna, a directional coupler is used for acquiring respective signals corresponding to a forward voltage wave supplied to the antenna, and the associated return voltage wave. The amplitudes of the forward and return waves are calculated in a controller for all matching conditions of a transformation network, the transformation network being interconnected between the high frequency system and the antenna. When a tomogram is to be produced, the transformation network is set so that the antenna is matched as best as is possible to the high-frequency system. The same method can be used for matching an antenna which is only used for reception when producing tomograms.

REFERENCES:
patent: 4739269 (1988-04-01), Kopp
patent: 4792960 (1988-12-01), Jacob et al.

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