Gradient coil system for a nuclear magnetic resonance tomography apparatus which reduces acoustic noise

US5235283A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Dietmar Lehne · Baiersdorf, DE
• Guenter Theil · Erlangen, DE
• Guenther Pausch · Effeltrich, DE
• Wolfgang Rogler · Erlangen, DE

Key dates

• Filing date: Feb 3, 1992
• Grant date: Aug 10, 1993
• Expiry date: Feb 3, 2012

Classification

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

Abstract

The supply of current pulses to gradient coils in a magnetic resonance imaging tomography apparatus results in physical vibration of the coils, causing acoustic noise. For reducing such acoustic noise, a gradient coil system is disclosed wherein the individual gradient coils are secured on a tubular carrier formed by a two concentric shells. The two shells are joined to each other in a manner which is rigid against shearing in the longitudinal direction by connector elements. The self-excited vibrational behavior of the gradient coil system is thereby tuned to lower vibrational amplitudes and to higher vibrational frequencies, so that a more effective damping can be achieved with acoustic damping measures.