Abstract #3734

Reducing acoustic noise in head-only scanners with padding on the RF coil

Nicolas Boulant¹, Erica Walker^2,3, Samantha MA⁴, Alexander Beckett^2,3, An Vu^5,6, Shajan Gunamony⁷, and David Feinberg^2,3

¹NeuroSpin, CEA, Gif sur Yvette, France, ²Advanced MRI technologies, Sebastopol, CA, United States, ³Helen Wills Neuroscience institute, University of California, Berkeley, CA, United States, ⁴Siemens Medical Solutions USA Inc, Berkeley, CA, United States, ⁵University of California, San Francisco, CA, United States, ⁶San Francisco VA Health Care System, San Francisco, CA, United States, ⁷Imaging Centre of Excellence, University of Glasgow, Glasgow, United Kingdom

Synopsis

Keywords: High-Field MRI, Safety

Motivation: Acoustic noise can be a severe physiological barrier for acquisitions at high field.

Goal(s): To isolate the main source of acoustic noise in the NexGen 7T scanner and investigate ways to reduce it.

Approach: Vibration and acoustic noise measurements were performed. Sponge window seal materials were stuck on the RF coil to attempt altering its vibrations and decrease acoustic noise.

Results: The experimental data is consistent with noise induced by eddy-currents on the RF shield. Altering its vibrations allowed decreasing sound level by up to 10 dB at some EPI echo-spacings.

Impact: Identifying the main source of acoustic noise shall open new research avenues to mitigate acoustic noise

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