An active noise cancellation system to reduce the intense noise caused by magnetic resonance imaging

2007 ◽  
Vol 121 (5) ◽  
pp. 3186-3186
Author(s):  
Deborah Hall ◽  
John Chambers ◽  
Kimberly Quinn ◽  
Michael Akeroyd
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Noise Cancellation ◽  
Resonance Imaging ◽  
Active Noise Cancellation ◽  
Active Noise ◽  
Intense Noise

In-Situ Active Noise Cancellation Applied to Magnetic Resonance Imaging

2009 ◽  
Author(s):  
Brent W. Rudd ◽  
Teik C. Lim ◽  
Mingfeng Li ◽  
Jing-Huei Lee
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Physical Simulation ◽  
Active Noise Control ◽  
Noise Cancellation ◽  
Resonance Imaging ◽  
Imaging Protocol ◽  
Active Noise Cancellation ◽  
Active Noise

Magnetic Resonance Imaging (MRI) is a powerful medical diagnostic tool. Unfortunately, the loud noise produced during scanning is unpleasant and potentially harmful to patients and may limit imaging protocol. A variety of approaches have been proposed to reduce noise exposure. Prior studies have been conducted in a sound quality chamber to aid in the development and implementation of hardware, algorithms, and procedures, which resulted in an active noise cancellation system tailored to conditions present during MRI. The active noise control system generates a secondary sound signal fed into a set of headphones worn by the patient. This system performs well during physical simulation of scanning conditions. In this study, the headphones are worn by a dummy during in-situ MRI scanning. Our specific effort is to take a selected successful experiment under simulated conditions and repeat it during live scanning to evaluate the real time performance of the system conducted in-situ. Evaluation of a common scanning sequence was conducted and the procedure adjusted to maximize the performance of the system. The sound pressure levels (SPLs) at the patient’s ear were measured with and without active control operational, and the results are compared to evaluate the active noise cancellation system’s performance during live scans.

In Situ Active Noise Cancellation Applied to Magnetic Resonance Imaging

2012 ◽  
Vol 134 (1) ◽  
Author(s):  
Brent W. Rudd ◽  
Teik C. Lim ◽  
Mingfeng Li ◽  
Jing-Huei Lee
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Physical Simulation ◽  
Active Noise Control ◽  
Noise Cancellation ◽  
Resonance Imaging ◽  
Imaging Protocol ◽  
Active Noise Cancellation ◽  
Active Noise

Magnetic Resonance Imaging (MRI) is a powerful medical diagnostic tool. Unfortunately, the loud sound produced during scanning is unpleasant, potentially harmful to patients, and may limit imaging protocol. Previously, a variety of approaches have been proposed to reduce noise exposure with limited success. This work is directed at the application of an active noise control system which generates a secondary sound signal fed into a set of headphones that could be worn by the patient. To this end, prior studies have been conducted in a sound quality chamber to aid in the development and implementation of the hardware, algorithms and procedures, which resulted in an active noise cancellation system tailored to conditions present during MRI. This system performs well during physical simulation of scanning conditions. In this study, the headphones are worn by a dummy during in situ MRI scanning. Our specific effort is to take a selected set of successful experiments under simulated conditions and repeat it during live scanning to evaluate the real time performance of the system conducted in situ. The evaluation was conducted with an echo planar imaging (EPI) scanning sequence and the procedure adjusted to maximize the performance of the system. The sound pressure levels at the patient’s ear were measured with and without active control operational, and the results were compared to evaluate the active noise cancellation system’s performance during live scans. The controller produced an overall reduction of 10.6 dBA across the full audible spectrum.

scholarly journals Real-time noise cancellation for speech acquired in interactive functional magnetic resonance imaging studies

2010 ◽  
Vol 32 (3) ◽  
pp. 705-713 ◽  
Author(s):  
Mikhail Zvyagintsev ◽  
Martin Klasen ◽  
Krystyna A. Mathiak ◽  
René Weber ◽  
J. Christopher Edgar ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Functional Magnetic Resonance Imaging ◽  
Real Time ◽  
Noise Cancellation ◽  
Functional Magnetic Resonance ◽  
Resonance Imaging ◽  
Imaging Studies
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