Circularly polarizing RF antenna for an MRI apparatus having a C-magnet

US5144241A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

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

Key dates

• Filing date: Aug 15, 1990
• Grant date: Sep 1, 1992
• Expiry date: Aug 15, 2010

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R33/343
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A circularly polarizing RF antenna suitable for use in an MRI apparatus for obtaining tomograms of an examination subject includes two antenna systems, each having a winding, having two lateral legs and a middle leg, and a return path which form a resonant circuit in combination with one or more resonant capacitors. The middle legs of the two antenna systems are disposed so that they cross one another. One or more decoupling capacitors are provided between the two antenna systems. A circularly polarizing antenna for a magnetic resonance imaging system is thus obtained having a magnetic field vector in the imaging region which rotates in planes parallel to the pole surfaces of a C-shaped magnet which generates the fundamental magnetic field in the magnetic resonance imaging apparatus.