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. Author manuscript; available in PMC: 2009 Apr 1.

Published in final edited form as: Magn Reson Imaging. 2007 Dec 3;26(3):393–400. doi: 10.1016/j.mri.2007.08.003

Spectrum of untreated MRI noise (), treated acoustic signal after applying feedback control only (), treated acoustic signal after applying feedforward control only () and treated acoustic signal after applying hybrid control (). Note that the response in the two frequency ranges, 580 Hz ∼ 1.03 kHz and 1.6 kHz ∼ 2.2 kHz, are increased slightly after applying control.

Inline graphic — Spectrum of untreated MRI noise (), treated acoustic signal after applying feedback control only (), treated acoustic signal after applying feedforward control only () and treated acoustic signal after applying hybrid control (). Note that the response in the two frequency ranges, 580 Hz ∼ 1.03 kHz and 1.6 kHz ∼ 2.2 kHz, are increased slightly after applying control.