Time-variable magnetic fields generator for a magnetic resonance apparatus

US6930482B2 · kind B2 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Oliver Heid · Erlangen, DE
• Markus Vester · Koblenzer Straße, DE

Key dates

• Filing date: Mar 25, 2004
• Grant date: Aug 16, 2005
• Expiry date: Mar 25, 2024

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R33/422
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A time-variable magnetic fields generator for a magnetic resonance apparatus has at least one gradient coil with conductors extending essentially in the region of a subject-receiving hollow opening of the magnetic resonance apparatus, and that is free of conductors in a middle axial region of the hollow opening, a first radio-frequency shield that encloses the conductors disposed on the one side of the middle region, a second radio-frequency shield that encloses the conductors disposed on the other side of the middle region, a radio-frequency antenna element that emits a radio-frequency field, disposed between the first and second radio-frequency shield in the middle region, a third radio-frequency shield proceeding radially, externally around the antenna element, such that the radio-frequency shields delimit a field return space within the generator and that is designed for a return of the radio-frequency field.