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Abstract #4179

Planning Current Nulling for Worst Case SAR reduction in a Cardiac Guidewire Scenario at 1.5T

J. Nuno Teixeira1, Felipe Godinez1, Shaihan Malik1, and Joseph V. Hajnal1

1School of Biomedical Engineering & Imaging Sciences, King's College London, London, United Kingdom

Interventional MRI using long conductive guidewires, risks high Local SAR and reduced image quality. This work expands on previous work relating current ‘nulling’ techniques to reducing worst case SAR, by investigating the importance of wire placement and current sensing planning. Results showed that two very distinct wires displayed common features but differences in behaviour do not allow for a generic ‘nulling’ plan. Also, there is a trade-off between removing current-generating modes, and reducing B1+ efficiency that subsequently increases RF power to achieve necessary image quality. Overall, a careful study of the system can help find the optimal ‘nulling’ plan.

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