Method and magnetic resonance apparatus for setting a shim to homogenize a magnetic field in the apparatus

US7548061B2 · kind B2 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Andrew Dewdney · Fairview Avenue, DE
• Franz Schmitt · Erlangen, DE

Key dates

• Filing date: Feb 26, 2008
• Grant date: Jun 16, 2009
• Expiry date: Feb 26, 2028

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R33/483
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

In a method for determination or adaptation of a shim for homogenization of a magnetic field of a magnetic resonance apparatus, which magnetic field is provided for the generation of magnetic resonance exposures of a specific examination region, an automatic determination, of a computer and/or supported by an operator on an image output unit of the computer, is made of a three-dimensional volume that is relevant for the determination or adaptation of the shim and that is matched to the examination region and/or an examination protocol by selection from an arbitrary morphology set of selectable volumes (which morphology set is not limited to specific shapes) and/or by generation of an arbitrarily three-dimensional volume not limited to specific shapes. The computer then automatically calculates the shim for the determined or selected three-dimensional volume.