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In Situ Active Control of Noise in a 4-Tesla MRI Scanner
Filetype[PDF - 2.77 MB]


Details:
  • Pubmed ID:
    21751284
  • Pubmed Central ID:
    PMC3193878
  • Funding:
    EB005042/EB/NIBIB NIH HHS/United States
    R21 EB005042/EB/NIBIB NIH HHS/United States
    R21 EB005042-01A1/EB/NIBIB NIH HHS/United States
    R21 EB005042-02/EB/NIBIB NIH HHS/United States
    T42/OH008432-05/OH/NIOSH CDC HHS/United States
  • Document Type:
  • Collection(s):
  • Description:
    Purpose

    To evaluate the effectiveness of the proposed active noise control (ANC) system for the reduction of the acoustic noise emission generated by a 4 T MRI scanner during operation and to assess the feasibility of developing an ANC device that can be deployed in situ.

    Materials and Methods

    Three typical scanning sequences, namely EPI (echo planar imaging), GEMS (gradient echo multi-slice) and MDEFT (Modified Driven Equilibrium Fourier Transform), were used for evaluating the performance of the ANC system, which was composed of a magnetic compatible headset and a multiple reference feedforward filtered-x least mean square controller.

    Results

    The greatest reduction, about 55 dB, was achieved at the harmonic at a frequency of 1.3 kHz in the GEMS case. Approximately 21 dB and 30 dBA overall reduction was achieved for GEMS noise across the entire audible frequency range. For the MDEFT sequence, the control system achieved 14 dB and 14 dBA overall reduction in the audible frequency range, while 13 dB and 14 dBA reduction was obtained for the EPI case.

    Conclusion

    The result is highly encouraging because it shows great potential for treating MRI noise with an ANC application during real time scanning.