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Abstract #1458

Transmit Coil impedance measurements to estimate radiofrequency induced currents on wires in MRI

Brandon J Coles1, Kevan J Anderson2, Greig C Scott3, Christopher W Ellenor3, and Graham A Wright1,2

1Medical Biophysics, University of Toronto, Toronto, ON, Canada, 2Sunnybrook Research Institute, Toronto, ON, Canada, 3Electrical Engineering Department, Stanford University, Stanford, CA, United States

MRI introduces a safety risk when performing imaged guided interventions caused by induced currents on interventional devices that potentially lead to dangerous temperature increases near their tip. This safety issue can be reduced using parallel RF transmission approaches, although it is difficult to ensure safety when device motion is involved. In this work, impedance changes of a transmit coil are used to estimate the coil’s induced current on a device, and this is extended to a two coil array to determine individual transmit signals needed to reduce the total induced current on a device with simple device geometry.

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