Controlling gradient coils taking the inductive coupling into account

US9176209B2 · kind B2 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Eva Eberlein · Baiersdorf, DE
• Ralph Kimmlingen · Zirndorf, DE
• Helmut Lenz · Tutzing, DE
• Franz Schmitt · Erlangen, DE

Key dates

• Filing date: Jul 18, 2012
• Grant date: Nov 3, 2015
• Expiry date: Mar 11, 2034

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R33/3852
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A gradient pulse generator generates reference current signals for a plurality of gradient coils of a gradient coil system of a magnetic resonance system and supplies each of the reference current signals to a controller assigned to one of the gradient coils. Also supplied to the respective controller is an actual current signal that is characteristic of the current flowing in the respective gradient coil. Each of the controllers generates a control signal and accordingly drives a gradient power amplifier assigned to the respective gradient coil. The gradient power amplifiers apply a current to the gradient coils assigned to the gradient power amplifiers in accordance with the generated control signals. Each of the controllers is also supplied with the reference current signal or the actual current signal of at least one other gradient coil or the time derivative of the reference current signal or the actual current signal.