A study of the position of the reference microphone of active noise control of feedforward type for MRI noise

Kenji Muto, Shohei Nakayama, Ryosuke Osada, Kazuo Yagi, Guoyue Chen

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

Magnetic resonance imaging (MRI) devices generate loud acoustical noise during operation. The sound pressure level of the MRI noise depends on the imaging sequence, but it is generally 100 dB or more. Our current study is aimed at the improvement of the acoustical environment for the MRI patient by means of an active noise control system. We propose using a feedforward system because acoustical MRI noise typically comprises unsteady pulse waves. It is important for a feedforward system that the reference microphone is located near the sound source. Here, we discuss the measurement of the sound source of MRI acoustical noise to position a reference microphone and show the effect of reference microphone position in an active noise control system by computer simulation. The apparent source of MRI acoustical noise was estimated from the delay time of the cross correlation between the signals of two microphones on the table in the MRI gantry. The result indicates that the apparent source lies between the center and edge of the gantry. Computer simulation shows that the proposed system produces substantial noise reduction when the reference microphone is attached in the vicinity of the apparent origin of the sound, such as in the wall of the scanner.

Original languageEnglish
Title of host publicationINTERNOISE 2014 - 43rd International Congress on Noise Control Engineering
Subtitle of host publicationImproving the World Through Noise Control
EditorsJohn Davy, Marion Burgess, Charles Don, Liz Dowsett, Terry McMinn, Norm Broner
PublisherAustralian Acoustical Society
ISBN (Electronic)9780909882037
Publication statusPublished - 2014 Jan 1
Event43rd International Congress on Noise Control Engineering: Improving the World Through Noise Control, INTERNOISE 2014 - Melbourne, Australia
Duration: 2014 Nov 162014 Nov 19

Publication series

NameINTERNOISE 2014 - 43rd International Congress on Noise Control Engineering: Improving the World Through Noise Control

Conference

Conference43rd International Congress on Noise Control Engineering: Improving the World Through Noise Control, INTERNOISE 2014
CountryAustralia
CityMelbourne
Period14/11/1614/11/19

Keywords

  • MRI acoustical noise
  • Reference microphone
  • Sound source

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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  • Cite this

    Muto, K., Nakayama, S., Osada, R., Yagi, K., & Chen, G. (2014). A study of the position of the reference microphone of active noise control of feedforward type for MRI noise. In J. Davy, M. Burgess, C. Don, L. Dowsett, T. McMinn, & N. Broner (Eds.), INTERNOISE 2014 - 43rd International Congress on Noise Control Engineering: Improving the World Through Noise Control (INTERNOISE 2014 - 43rd International Congress on Noise Control Engineering: Improving the World Through Noise Control). Australian Acoustical Society.