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Abstract #3554

Vibroacoustic Noise Reduction in High Performance Head Gradient Coils Using Ceramic Inserts

Simone Angela Winkler1, Andrew Alejski2, Trevor Wade2, Charles McKenzie2, and Brian K Rutt1

1Dept. of Radiology, Stanford University, Stanford, CA, United States, 2Robarts Research Institute, The University of Western Ontario, London, ON, Canada

We hypothesized that ceramic inserts will reduce sound pressure levels (SPLs) in high performance head gradient coils. We used realistic multi-physics modeling methods (previously validated by experiments) to investigate this hypothesis, and in particular to evaluate vibroacoustic reductions as a function of ceramic insert geometry and frequency of excitation. Averaged over the range 0-3000Hz, we demonstrate a maximum overall SPL reduction of 10.9dB, with a substantially higher reduction in the high frequency regime (2000-3000Hz) of 20.7dB. We show that a uniform 15mm thick cylindrical insert is a practical design that yields the majority of the acoustic reduction benefit.

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