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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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