Characterization of vibration and acoustic noise in a gradient-coil insert

Magma
G Z YaoBrian K Rutt

Abstract

High-speed switching of current in gradient coils within high magnetic field strength magnetic resonance imaging (MRI) scanners results in high acoustic sound pressure levels (SPL) in and around these machines. To characterize the vibration properties as well as the acoustic noise properties of the gradient coil, a finite-element (FE) model was developed using the dimensional design specifications of an available gradient-coil insert and the concentration of the copper windings in the coil. This FE model was then validated using experimentally collected vibration data. A computational acoustic noise model was then developed based on the validated FE model. The validation of the finite-element analysis results was done using experimental modal testing of the same gradient coil in a free-free state (no boundary constraints). Based on the validated FE model, boundary conditions (supports) were added to the model to simulate the operating condition when the gradient-coil insert is in place in an MRI machine. Vibration analysis results from the FE model were again validated through experimental vibration testing with the gradient-coil insert installed in the MRI scanner and excited using swept sinusoidal time waveforms. The simulati...Continue Reading

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Citations

Mar 11, 2008·Journal of Magnetic Resonance·Terence W NixonRobin A de Graaf
Mar 12, 2011·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Erin L MacMillanRoland Kreis
May 10, 2006·NeuroImage·Jaana HiltunenRaimo Joensuu
May 28, 2005·NMR in Biomedicine
Oct 4, 2017·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Ek T TanThomas K F Foo
Nov 20, 2016·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Simone A WinklerBrian K Rutt
Dec 14, 2017·Computational and Mathematical Methods in Medicine·Jiaofen NanYongquan Xia

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