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TECHNICAL PAPERS

MRI Gradient Coil Cylinder Sound Field Simulation and Measurement

[+] Author and Article Information
Chris K. Mechefske, Yuhua Wu

Dept. of Mechanical Engineering, Queens’ University, Kingston, Ontario, Canada K7L 3N6

Brian K. Rutt

The John P Robarts Research Center, 100 Perth Drive, London, Ontario, N6A 5K8

J Biomech Eng 124(4), 450-455 (Jul 30, 2002) (6 pages) doi:10.1115/1.1488169 History: Received January 01, 2000; Revised April 01, 2002; Online July 30, 2002
Copyright © 2002 by ASME
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References

Mechefske,  C. K., Wu,  Y., Chronik,  B., Bowen,  C., and Rutt,  B. K., 2000, “Gradient-Induced Acoustic and Magnetic Field Fluctuations in a 4T Whole-Body MR Imager,” Magn. Reson. Med., 44, pp. 532–536.
Hurwitz,  R., Lane,  S. R., Bell,  R. A., and Brant-Zawadski,  N. M., 1989, “Acoustic Analysis of Gradient Coil Noise in MR Imaging,” Radiology, 173, pp. 545–548.
Shellock,  F. G., Morisoli,  S. M., and Ziarati,  M., 1994, “Measurement of Acoustic Noise During MR Imaging: Evaluation of Six “Worst-case” Pulse Sequences,” Radiology, 191, pp. 91–93.
Hedeen,  R. A., and Edelstein,  W. A., 1997, “Characterization and Prediction of Gradient Acoustic Noise in MR Imagers,” Magn. Reson. Med., 37, pp. 7–10.
Mansfield,  P., Chapman,  B. L. W., Bowtell,  R., Glover,  P., Coxon,  R., and Harvey,  P. R., 1995, “Active Acoustic Screening: Reduction of Noise in Gradient Coils by Lorentz Force Balancing,” Magn. Reson. Med., 33, pp. 276–281.
Wu, Y., Mechefske, C. K., Chronik, B., and Rutt, B. K., 1999, “Acoustic Distribution Within Gradient Coils in MR Imagers,” Canadian Medical and Biological Engineering Society Conference, London, Ontario, Canada, 24–26 June, pp. 28–29.
Mechefske, C. K., Wu, Y., and Rutt, B. K., 2001, “Characterization of Acoustic Noise and Magnetic Field Fluctuations in a 4T Whole-Body MRI Scanner,” Mech. Syst. Signal Process., In print.
Mechefske, C. K., Wu, Y., and Rutt, B. K., 2001, “Acoustic Noise Reduction in a 4T MRI Scanner,” 18th Canadian Congress of Applied Mechanics—CANCAM 2001, St. John’s, NFLD, Canada, pp. 365–366.
Rutt, B. K., Mechefske, C. K., Gati, J., Geris, R., and Wu, Y., 2001, “Acoustic Noise Reduction in a 4T Whole Body MR Imager,” The International Society of Magnetic Resonance in Medicine Conference, Glasgow, Scotland, pp. 1356–1357.
Katsunuma, A., Takamori, H., Yoshida, T., Kawamoto, H., Uosak, Y., Hanawa, M., and Iinuma, K., 2000, “Silent MRI System by Interrupting the Vibrational Transmission Through the Air and Solid Structures,” The International Society of Magnetic Resonance in Medicine Conference, Denver Colorado, USA.
Zhou, Y., and Ma, J., 2000, “Acoustic Noise Reduction in MRI by Selective Gradient Derating,” The International Society of Magnetic Resonance in Medicine Conference, Denver, Colorado, USA.
Pierce, A. D., 1994, “Acoustics: An Introduction to Its Physical Principles and Applications,” J. Acoust. Soc. Am., Acoustical Society of America, Woodbury, New York.
Koopmann, G. H., and Fahnline, J. B., 1997, Designing Quiet Structures: A Sound Power Minimization Approach, Academic Press, London, UK.
Kuijpers,  A. H. W. M., Rienstra,  S. W., Verbeek,  G., and Verheij,  J. W., 1998, “The Acoustic Radiation of Baffled Finite Ducts with Vibrating Walls,” J. Sound Vib., 216(3), pp. 461–493.

Figures

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A baffled finite duct model of the gradient coil cylinder with vibrating walls and showing sound radiation
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(a) Head and neck gradient coil cylinder with constraints; (b) Head and neck gradient coil cylinder inside the whole body coil cylinder
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Calculated sound pressure level distribution along the centerline for the head/neck gradient coil cylinder
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Measured sound pressure level distribution along the centerline for the head/neck gradient coil cylinder
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Sound pressure level within a simple cylinder vibrating radially (via computational analysis, 150 Hz)
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Sound pressure level within a simple cylinder vibrating radially (via computational analysis, 400 Hz)
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Sound pressure level within a simple cylinder vibrating radially (via analytical solution, 150 Hz and 400 Hz)

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