Effect of an active noise control system on acoustical noise during magnetic resonance imaging diagnosis

Shohei Nakayama, Kenji Muto, Yagi Kazuo, Guoyue Chen

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

2 Citations (Scopus)

Abstract

A magnetic resonance imaging (MRI) equipment generates loud sounds during its operation. The sound pressure level depends on the imaging sequences but is generally around 100 dB. This makes patients uncomfortable, and temporary hearing loss is possible if ear protection to decrease the sound pressure level by 20 dB is not used. This situation is so discomforting to the patient that in some cases MRI diagnosis and treatment may be refused. We studied ear protectors with an active noise control (ANC) system. Traditional protectors can decrease sound pressure level for high frequencies, but ANC systems can control low-frequency sounds as well. This study considers improvements to the acoustical environment when using ANC systems for MRI patients. The ANC system we developed is a feedforward system because MRI acoustical noise is unsteady and pulsed. The system uses nonmagnetic devices, ear protectors, and optical microphones because MRI rooms are highly magnetic environments. A computer simulation showed that the transition of the level of MRI acoustical noise was controlled by the ANC system during a diagnosis. As a result, the system reduced the MRI acoustical noise from 110 dB to 70 dB and was capable of changing the imaging sequences during MRI operation. Copyright

Original languageEnglish
Title of host publication42nd International Congress and Exposition on Noise Control Engineering 2013, INTER-NOISE 2013
Subtitle of host publicationNoise Control for Quality of Life
PublisherOAL-Osterreichischer Arbeitsring fur Larmbekampfung
Pages3603-3608
Number of pages6
ISBN (Print)9781632662675
Publication statusPublished - 2013 Jan 1
Event42nd International Congress and Exposition on Noise Control Engineering 2013: Noise Control for Quality of Life, INTER-NOISE 2013 - Innsbruck, Austria
Duration: 2013 Sep 152013 Sep 18

Publication series

Name42nd International Congress and Exposition on Noise Control Engineering 2013, INTER-NOISE 2013: Noise Control for Quality of Life
Volume5

Conference

Conference42nd International Congress and Exposition on Noise Control Engineering 2013: Noise Control for Quality of Life, INTER-NOISE 2013
CountryAustria
CityInnsbruck
Period13/9/1513/9/18

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ASJC Scopus subject areas

  • Acoustics and Ultrasonics

Cite this

Nakayama, S., Muto, K., Kazuo, Y., & Chen, G. (2013). Effect of an active noise control system on acoustical noise during magnetic resonance imaging diagnosis. In 42nd International Congress and Exposition on Noise Control Engineering 2013, INTER-NOISE 2013: Noise Control for Quality of Life (pp. 3603-3608). (42nd International Congress and Exposition on Noise Control Engineering 2013, INTER-NOISE 2013: Noise Control for Quality of Life; Vol. 5). OAL-Osterreichischer Arbeitsring fur Larmbekampfung.