Magnetic resonance tomography apparatus having a gradient coil system with a structural design wherein a scalar product of a natural oscillation mode and Lorentz forces is minimized toward zero

US6462547B1 · kind B1 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Oliver Heid · Erlangen, DE
• Peter Dietz · Bad Mergentheim, DE
• Ralph Kimmlingen · Zirndorf, DE

Key dates

• Filing date: Mar 7, 2000
• Grant date: Oct 8, 2002
• Expiry date: Mar 7, 2020

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R33/3854
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

Magnetic resonance tomography device has a gradient coil system that is fashioned such that the natural oscillation modes of the gradient coil system and the Lorentz forces are optimally orthogonally oriented toward one another, and a scalar product of the natural oscillation mode and the Lorentz force is formed for each point of the gradient coil system. A summation of these products, results in a value that is as close to zero as possible for each natural oscillation mode with the natural oscillation modes being prescribed by a weight- and/or spring rigidity distribution of the carrier structure, by weights that are introduced into the carrier structure and/or by components that modify the spring rigidity, or by heavy end rings and/or by setting the Lorentz forces by fashioning the conductor arrangement of the primary coil and/or a secondary coil, if present, and/or additional conductor sections given tubular gradient coil systems.