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Related Experiment Videos

Active acoustic control in gradient coils for MRI.

P Mansfield1, B Haywood, R Coxon

  • 1Magnetic Resonance Center, School of Physics and Astronomy, University of Nottingham, UK.

Magnetic Resonance in Medicine
|October 9, 2001
PubMed
Summary

Active acoustic control in gradient coil design significantly reduces acoustic output. New theoretical and empirical models explain the effectiveness of control windings in reducing noise from MRI systems.

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Physics in medicine and biology·2008

Area of Science:

  • Medical Imaging Physics
  • Acoustic Engineering
  • Electromagnetism

Background:

  • Gradient coil systems in Magnetic Resonance Imaging (MRI) generate significant acoustic noise.
  • Previous work by Mansfield and Haywood introduced principles of active acoustic control for gradient coils.

Purpose of the Study:

  • To further develop theoretical principles for active acoustic control in gradient coil design.
  • To analyze the far-field acoustic output of a single sector in a multi-sector coil system.
  • To explain the acoustic output differences between full and reduced output modes.

Main Methods:

  • Theoretical development for far-field acoustic output of split-plate coil sectors with primary and control windings.
  • Experimental testing of two coil sectors made from different plastic materials across a range of frequencies.

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  • Derivation of new theoretical expressions based on normal mode expansions for plate analysis.
  • Development of empirical expressions incorporating longitudinal and transverse plate characteristics.

    • Main Results:

    • Substantial average reductions in acoustic output were observed when the control winding was appropriately driven.
    • New theoretical expressions accurately explain the acoustic output differences between full and reduced modes.
    • Empirical expressions showed good agreement with experimental data for acoustic output as a function of frequency.

    Conclusions:

    • Active acoustic control using a narrow inner re-entrant loop control winding is effective in reducing MRI gradient coil noise.
    • The developed theoretical and empirical models provide a better understanding of acoustic output in gradient coil systems.
    • This research contributes to quieter MRI environments through optimized gradient coil design.