Method and magnetic resonance tomography apparatus for spatially resolved measurement of the B1 field distribution

US7038453B2 · kind B2 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Thorsten Feiweier · Peising, DE
• Peter Heubes · Baiersdorf, DE

Key dates

• Filing date: Aug 19, 2004
• Grant date: May 2, 2006
• Expiry date: Aug 19, 2024

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R33/583
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

In a method and magnetic resonance tomography apparatus for spatially resolved measurement of the magnetic high frequency field distribution in the apparatus, a double echo high frequency pulse sequence with a first excitation pulse following by at least two refocusing pulses are emitted for generation of a first echo and a following second echo. At least the excitation pulse is slice selective. In an excitation layer defined by the slice selective excitation pulse a first echo image and second echo image are spatially resolved by using suitable gradient pulses for phase or frequency encoding Using the relationships of the amplitudes of the first and second echo image in the various locations the flip angles representing the field strength at the relevant locations in the relevant slice are determined.