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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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