Resonator for a magnetic resonance imaging apparatus

US5128615A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Ralph Oppelt · Uttenreuth, DE
• Wilhelm Duerr · Erlangen, DE
• Horst Siebold · Erlangen, DE

Key dates

• Filing date: Dec 6, 1990
• Grant date: Jul 7, 1992
• Expiry date: Dec 6, 2010

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R33/341
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A resonator for use in a magnetic resonance imaging apparatus for transmitting and receiving high frequency signals is formed by a combination of two antenna sub-systems, which generate respective magnetic fields which are perpendicular to each other, with the currents in the sub-system being phase-shifted by 90.degree. relative to each other, and each sub-system includes a capacitance which defines the resonant frequency. Each of the sub-systems forms a current loop, the current loops containing a common current network and a common base plate, which serves as a return path for both current loops. The junctions of the current network are connected via the resonant capacitances to the base plate, which consists of electrically conductive material. A circularly polarizing resonator is achieved for the transversal, fundamental field of the imaging apparatus, with the resonator also being capable of use as a surface resonator if the spacing between the current network and the base plate is small.