The suppression of selected acoustic frequencies in MRI

Xingxian Shou, Xin Chen, Jamal Derakhshan, Timothy Eagan, Tanvir Baig, Shmaryu Shvartsman, Jeffrey Duerk, Robert Brown

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

A study is made of certain dominant frequencies in the acoustic noise spectrum of the magnetic resonance imaging system. Motivated by both spring and string ideas, we investigate whether the contributions to the sound from certain frequencies can be canceled by the appropriate gradient pulse sequence design. From both simulations and experiments, vibrations resulting from an impulsive force associated with a ramping up of a gradient pulse are shown to be cancelled immediately upon the application of another impulsive force coming from the subsequent appropriately timed ramping down of that pulse. A general approach to suppression of multiple-frequency contributions involving a series of gradient pulses with variable timings is given for the cancellations between pairs of impulsive forces. Various examples are confirmed through string simulations, MRI experiments, and linear response theory. This also provides a foundation to explain some results in previous papers on this subject. The method suggests that a variety of pulse profiles and timing combinations can be used to attenuate important contributions to the acoustic spectrum.

Original languageEnglish
Pages (from-to)191-200
Number of pages10
JournalApplied Acoustics
Volume71
Issue number3
DOIs
StatePublished - Mar 2010

Keywords

  • Acoustic noise
  • Gradient pulse optimization
  • MRI system
  • Vibrating string

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