Active Vibration Control of Gradient Coils to Reduce Acoustic Noise of MRI Systems

Lorentz-force-induced vibrations in MRI systems cause significant acoustic noise levels during scanning, the main acoustic noise source being the vibrating gradient coil. In this paper, a novel active vibration control technique is presented to reduce vibrations of the gradient coil, and hence, achi...

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Bibliographic Details
Published in:IEEE/ASME transactions on mechatronics 2008-06, Vol.13 (3), p.325-334
Main Authors: Roozen, N.B., Koevoets, A.H., den Hamer, A.J.
Format: Article
Language:English
Subjects:
Acoustic imaging
Acoustic noise
Active control
Actuators
Coils
Control systems
dynamics
feedforward systems
Magnetic field measurement
Magnetic resonance imaging
Noise levels
Noise reduction
piezoelectric transducers
Reduction
Vibration
Vibration control
Vibration measurement
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Summary:Lorentz-force-induced vibrations in MRI systems cause significant acoustic noise levels during scanning, the main acoustic noise source being the vibrating gradient coil. In this paper, a novel active vibration control technique is presented to reduce vibrations of the gradient coil, and hence, achieve a reduction of acoustic noise during scanning. The active vibration control technique uses seismic masses that are actuated by means of piezo actuators to create forces on the gradient coil counteracting its vibrations. Using four seismic mass actuators, a vibration reduction of 3-8 dB at resonance frequencies is achieved, giving an overall vibration reduction of 3 dB for a typical field gradient (FE)-echo planar imaging (EPI) gradient sequence, as substantiated by measurements. Using eight actuators, an overall vibration reduction of 5 dB is predicted for this sequence.
ISSN:1083-4435
1941-014X
DOI:10.1109/TMECH.2008.924111