Abstract #1389
Improved magnetically induced torque measurement for MRI safety testing
Fred Tam 1 , Peter Geng 2 , and Simon J Graham 1,3
1
Physical Sciences, Sunnybrook Research
Institute, Toronto, Ontario, Canada,
2
Department
of Mechanical and Mechatronics Engineering, University
of Waterloo, Waterloo, Ontario, Canada,
3
Department
of Medical Biophysics, University of Toronto, Toronto,
Ontario, Canada
Torque measurements for MRI safety testing are often
qualitative, despite ASTM standard F2213-06 which
prescribes a quantitative measurement method and
apparatus. To facilitate quantitative measurement,
practical improvements were made to this apparatus,
including a calibration procedure for its torsion
springs. The resulting apparatus has increased capacity
and simplified construction, and its accuracy has been
characterized. Calibration data reveal nonlinear
behaviour, warning against naive use of the simple
formula in F2213-06. Example usage of the apparatus
shows a prototype tablet device for fMRI passes F2213-06
criteria.
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