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.
How to access this content:
For one year after publication, abstracts and videos are only open to registrants of this annual meeting. Registrants should use their existing login information. Non-registrant access can be purchased via the ISMRM E-Library.
After one year, current ISMRM & ISMRT members get free access to both the abstracts and videos. Non-members and non-registrants must purchase access via the ISMRM E-Library.
After two years, the meeting proceedings (abstracts) are opened to the public and require no login information. Videos remain behind password for access by members, registrants and E-Library customers.
Click here for more information on becoming a member.
