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http://dx.doi.org/10.5050/KSNVE.2014.24.1.062

Active Noise Control for Target Point Inside Bore Using Property of MRI Noise  

Lee, Nokhaeng (KAIST, Department of Mechanical Engineering)
Park, Youngjin (KAIST, Department of Mechanical Engineering)
Park, Youn-Sik (KAIST, Department of Mechanical Engineering)
Publication Information
Transactions of the Korean Society for Noise and Vibration Engineering / v.24, no.1, 2014 , pp. 62-68 More about this Journal
Abstract
Recently, MRI(magnetic resonance imager) scanner is continually used for medical diagnosis and many biomedical researches. When it operates, however, intense noise is generated. The SPL(sound pressure level) of the noise approaches 130 dB especially in 3 T(Tesla) MRI. Meanwhile, more than 3 T MRI scanners have been developed to get higher-resolution images, so louder noise is expected in the future. The intense noise makes patients feel nervous and uncomfortable. Moreover, it could possibly cause hearing loss to patient in extreme cases. For this reason, some active noise control systems have been researched. One of them used feedback Filtered-X LMS(FXLMS) algorithm which is able to control only narrowband noises and possible to diverge in severe case. In this paper, we determine the property of MRI noise. Using the property, we applied a method of open-loop and adaptive control for reducing MRI noise at target point inside bore. We verified performance of the method with computer simulation and preliminary experiment. The results demonstrate that the method can effectively reduce MRI noise at target point.
Keywords
MRI(Magnetic Resonance Imager); ANC(Active Noise Control);
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Times Cited By KSCI : 1  (Citation Analysis)
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