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Abstract #4172

A Framework for Worst-Case SAR Reduction when Controlling Induced Currents on Elongated Conductors using Parallel Transmit

J. Nuno Teixeira1, Felipe Godinez1, Shaihan Malik1,2, and Joseph V Hajnal1,2
1Biomedical Engineering Department, School of Biomedical Engineering & Imaging Sciences, King's College London, London, United Kingdom, 2Centre for the Developing Brain, School of Biomedical Engineering & Imaging Sciences, King's College London, London, United Kingdom

MRI with elongated conductors (“wires”), risks tissue heating and reduced image quality. Parallel Transmit (pTx) systems can be configured to generate useful magnetic fields while reducing currents on wires, provided suitable current sensing is achieved. We propose a framework based on a current mode analysis for determining worst case SAR (wcSAR) when driving a pTx array so as to remove high current modes. This approach is demonstrated using FDTD simulations of two 8 channel pTx coils allowing comparison of full knowledge of currents with restricted point measurement, systematically determining the impact of current sensor number and location on wcSAR control.

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