Anti-interference filter for a gradient coil in a nuclear magnetic resonance imaging apparatus

US5200703A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Walter Popp · Emskirchen, DE
• Karl-Ulrich Erlenkamp · Nuremberg, DE
• Peter Feld · Nuremberg, DE
• Norbert Rietsch · Dormitz, DE
• Markus Vester · Koblenzer Straße, DE

Key dates

• Filing date: Sep 23, 1991
• Grant date: Apr 6, 1993
• Expiry date: Sep 23, 2011

Classification

• Technology area (CPC H): Electricity
• CPC primary: H03H2001/0085
• WIPO field: Basic communication processes
• WIPO sector: Electrical engineering

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.