Arrangement to correct eddy currents in a gradient coil

US7852086B2 · kind B2 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Ralph Kimmlingen · Zirndorf, DE
• Johann Schuster · Oberasbach, DE

Key dates

• Filing date: Mar 11, 2009
• Grant date: Dec 14, 2010
• Expiry date: Jun 12, 2029

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R33/4215
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

In an arrangement to correct eddy currents in a gradient coil of a magnetic resonance apparatus, the gradient coil having a primary gradient sub-coil and a secondary gradient sub-coil connected in series with the primary gradient sub-coil, the secondary gradient sub-coil is coupled with the primary gradient sub-coil such that the same magnitude gradient current flows through both (but in different directions) in order to compensate for magnetic field distortions of the primary gradient sub-coil. The primary gradient sub-coil has a first impedance while the secondary gradient sub-coil has a second impedance. A tuning impedance is connected in parallel with at least one of the two impedances.