Simulation of acoustical noise reduction for magnetic resonance imaging by an active control headphone with piezoelectric plate and earmuff

Ryosuke Osada, Kenji Muto, Kazuo Yagi, Guyoue Chen

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

1 Citation (Scopus)

Abstract

Magnetic resonance imaging (MRI) machines are widely used for medical examinations. However, they generate acoustical noise with sound pressure levels exceeding 100 dB. To solve this problem, we propose a headphone that uses active noise control (ANC) by a piezoelectric vibration plate in combination with an earmuff. This paper presents the results of analyzing MRI noise and shows the simulated noise reduction performance for the headphones with an inverse filter for pre-whitening in the simulated MRI room. Because MRI examination rooms are high-magnetic-field environments, all magnetic materials are prohibited. The proposed headphone uses a piezoelectric vibration plate made from a nonmagnetic material. Feedforward control is employed because the MRI noise has a pulse waveform with unstable amplitude. The headphone showed good noise reduction performance in the low-frequency band by ANC and in the high-frequency band by earmuff. The noise level was reduced to 67.9 dB. The headphone provides a more comfortable acoustic environment than the earmuff alone for a subject undergoing an MRI examination.

Original languageEnglish
Title of host publicationINTER-NOISE 2015 - 44th International Congress and Exposition on Noise Control Engineering
PublisherThe Institute of Noise Control Engineering of the USA, Inc.
Publication statusPublished - 2015
Event44th International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2015 - San Francisco, United States
Duration: 2015 Aug 92015 Aug 12

Other

Other44th International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2015
CountryUnited States
CitySan Francisco
Period15/8/915/8/12

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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