Activation of field coils of a magnetic resonance system having eddy current compensation

US9110145B2 · kind B2 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Eva Eberlein · Baiersdorf, DE
• Ralph Kimmlingen · Zirndorf, DE
• Franz Schmitt · Erlangen, DE
• Johann Schuster · Oberasbach, DE

Key dates

• Filing date: Jul 20, 2012
• Grant date: Aug 18, 2015
• Expiry date: Mar 13, 2034

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R33/389
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A controller of a magnetic resonance system determines an activation signal vector based on a target field predetermined for the controller in conjunction with field characteristics of field coils known to the controller. The activation signal vector includes a respective activation signal for each field coil. The controller determines the activation signal vector such that within a predetermined examination volume of the magnetic resonance system, any deviation of an ideal field that would result if ideal coils were subjected to the activation signals of the activation signal vector from the target field is minimized. The controller determines a compensation signal vector based on the activation signal vector in conjunction with eddy current characteristics of the field coils known to the controller. The compensation signal vector is used to minimize a deviation of an actual field from the target field within the predetermined examination volume of the magnetic resonance system.