Simulated study of active acoustic noise control of a magnetic resonance imaging scanner response

Mingfeng Li, Brent W. Rudd, Teik C. Lim, Jing Huei Lee

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

Abstract

Recent advancement in Magnetic Resonance Imaging (MRI) techniques for medical diagnosis and biomedical research dramatically reduces scanning time and improves clinical throughput uses powerful gradient magnetic fields with very rapid pulses. However, the rapidly pulsed gradient magnetic field required for fast imaging causes significant vibrations of the gradient coils and surrounding structures resulting in unacceptably high levels of acoustic noise emission. The extreme high level noise can be both annoying and harmful to patients and healthcare workers especially under long term exposure. Previous passive methods have not resulted in a satisfactory level even when ear protections are used. In this study, an active noise control scheme is proposed and studied for a pre-recorded noise from a 4-Tesla MRI scanner. The recorded MRI noise is played back through a high fidelity stereo system in a sound quality studio and controlled using a headset equipped with an active controller. Numerous parameters of the controller is tested and tuned to achieve the best possible performance. The results showed almost 20dB reduction at the principal harmonic and 12 dB overall reduction is achieved.

Original languageEnglish (US)
Title of host publicationInstitute of Noise Control Engineering of the USA - 23rd National Conference on Noise Control Engineering, NOISE-CON 08 and Sound Quality Symposium, SQS 08
Pages742-747
Number of pages6
StatePublished - 2008
Externally publishedYes
Event23rd National Conference on Noise Control Engineering, NOISE-CON 2008 and 3rd Sound Quality Symposium, SQS 2008 - Dearborn, MI, United States
Duration: Jul 28 2008Jul 31 2008

Publication series

NameInstitute of Noise Control Engineering of the USA - 23rd National Conference on Noise Control Engineering, NOISE-CON 08 and Sound Quality Symposium, SQS 08
Volume2

Conference

Conference23rd National Conference on Noise Control Engineering, NOISE-CON 2008 and 3rd Sound Quality Symposium, SQS 2008
Country/TerritoryUnited States
CityDearborn, MI
Period7/28/087/31/08

All Science Journal Classification (ASJC) codes

  • Acoustics and Ultrasonics

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