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Abstract #4212

Heating and torque of passive metallic implants by gradient dBdt and static field B0 in MRI  

John A Nyenhuis1
1Electrical Engineering, Purdue University, West Lafayette, IN, United States

The objective was to calculate heating and torque, which results in vibration, by the time-varying magnetic field dBdt from the gradients in MRI to identify which passive implants will have the largest gradient interactions. A large hip stem and an acetabular hip shell were selected as worse case practical implants for gradient interactions. Maximum temperature rise under the intense dBdt inputs (42 T/s, 1750 Hz, 15 minutes exposure) of ISO/IEC 10974 is 5.4 $$$^{\circ}$$$C for the hip stem and 7.0 $$$^{\circ}$$$C for the acetabular shell. Gradient torque was about 4 times the gravity value for the acetabular shell.

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