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Abstract #0359

An Investigation of SAR Values Induced Near an Orthopedic Implant at 7T Relative to Lower Fields: A Simulation Study

Paul S Jacobs1 and Andrew J Fagan1
1Radiology, Mayo Clinic, Rochester, MN, United States

Electromagnetic simulations were performed to investigate the maximum local 1g-averaged SAR induced in tissue adjacent to orthopedic screws of varying lengths across field strengths ranging from 3T to 7T. Simulated input power values were initially normalized to a constant transmitted power of 1W and further normalized to ensure a constant background B1+ value. SARmax was approximately 36% lower than the peak near 4T. The results demonstrate that RF-induced tissue heating near implants can, in certain circumstances, be lower at higher fields.

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