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Abstract #4852

A Traveling-Wave Approach to Acoustic Noise Reduction in MR Gradient Coils

Simone Angela Winkler 1 , Andrew Alejski 2 , Trevor Wade 2 , Charles McKenzie 2 , and Brian K Rutt 1

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

We present a new wave-based framework for understanding acoustic noise in MR gradient coils, and propose two new concepts for acoustic noise reduction. Results of this wave-based coupled structural-acoustic modeling, as well as experimental measurements, demonstrate that the addition of an impedance matching horn and an absorbing end cap both act to decrease acoustic noise inside the gradient coil. Simulation results show mean sound pressure level reductions of 2 dB for horn and end cap, and 3 dB for both used in combination. Experimental results show mean SPL reductions of 4 dB for horn and 9 dB for end cap.

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