Anti-interference filter for a gradient coil in a nuclear magnet

Details Anti-interference filter for a gradient coil in a nuclear magnet Anti-interference filter for a gradient coil in a nuclear magnet

1991-09-23

1993-04-06

Arana, Louis

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324318, G01V 300

Patent

active

052007030

ABSTRACT:
An anti-interference filter for radio-shielding a feeder to a gradient coil in a nuclear magnetic resonance imaging apparatus is constructed as a band elimination (band rejection) filter for the operating frequency of the nuclear magnetic resonance imaging apparatus. The anti-interference filter can be in the form of a directionally symmetrical quadrupole having two input terminals and two output terminals. A first input terminal and a first output terminal are introducible into the feeder to the gradient coil, and a second input terminal and a second output terminal are connected to a conductor at reference potential. A number of blocking circuits are arranged in series between the first input terminal and the first output terminal. A number acceptor circuits are arranged between the input terminals, between the junctions of the blocking circuits and the reference potential conductor, and between the output terminals. The number of acceptor circuits is one more than the number of blocking circuits.

REFERENCES:
patent: 4628264 (1986-12-01), Rzedzian
patent: 4644282 (1987-02-01), Kestler
patent: 4737712 (1988-04-01), Stormont et al.
patent: 4820986 (1989-04-01), Mansfield et al.
patent: 4862084 (1989-08-01), Mitomi
patent: 4910461 (1990-03-01), Van Vaals
patent: 5063349 (1991-11-01), Roemer et al.
"Taschenbuch der Hochfrequenztechnik", Meinke et al. pp. 198-199 (1962).
Patent Abstracts of Japan, E-712 Feb. 6, 1989, vol. 13/No. 51, Japanese Application No. 62-79316.

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