Optical control of radio frequency antennae in a magnetic resona

Details Optical control of radio frequency antennae in a magnetic resona Optical control of radio frequency antennae in a magnetic resona

1998-11-19

2000-11-07

Arana, Louis

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

G01V 300

Patent

active

061442054

ABSTRACT:
A local RF antenna assembly for a magnetic resonance imaging (MRI) system includes a conducting RF antenna structure. First and second capacitors are connected in series with the inductance of the RF antenna structure to form a circuit that resonates at a Larmor frequency. An inductor has a first terminal connected to a node between the first and second capacitors and has a second terminal. A photosensitive first semiconductor switch is connected between the second terminal of the inductor and one terminal of the RF antenna inductance. A receive coil control selectively provides illumination that places the photosensitive first semiconductor switch in a conductive state. When the photosensitive first semiconductor switch is conductive, the inductor disables resonance of the RF antenna circuit at the Larmor frequency. This action inhibits the RF receive antenna from interacting with other antennae in the MRI system.

REFERENCES:
patent: 5545999 (1996-08-01), Mueller et al.
patent: 5869966 (1999-02-01), Gatehouse

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