Abstract #1020
Lorentz Damping and the Field Dependence of Gradient Coil Vibroacoustics
Simone Angela Winkler 1 , Trevor P Wade 2 , Andrew Alejski 2 , Charles McKenzie 2 , and Brian K Rutt 1
1
Dept. of Radiology, Stanford University,
Stanford, CA, United States,
2
Robarts
Research Institute, The University of Western Ontario,
London, Ontario, Canada
We present a new comprehensive modeling approach for
understanding acoustic noise in MR gradient coils that
accounts for previously neglected but essential Lorentz
damping in vibration analysis. We used this approach to
predict the dependence of acoustic noise and vibration
levels on main field strength. We found that for main
field strengths of 3/7/10.5 T, the spectrally-averaged
sound pressure levels were 91.2/97.5/100.8 dB and
92.1/89.8/90.5 dB, for the no damping and Lorentz
damping cases, respectively. Inclusion of Lorentz
damping suggests that gradient acoustics and vibration /
mechanical stress may be much more manageable at ultra
high fields than previously thought.
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