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Abstract #0174

Gradient-Induced Voltages on 12-lead ECGs during High-Duty-Cycle MRI Sequences and a Theoretically based Method to Remove Them

HuaLei Zhang 1 , Zion Tsz ho Tse 2 , Charles L. Dumoulin 3 , Ronald Watkins 4 , Wei Wang 1 , Jay Ward 5 , Raymond Kwong 1 , William Stevenson 1 , and Ehud J. Schmidt 1

1 Brigham and Women's Hospital, Boston, MA, United States, 2 University of Georgia, Georgia, United States, 3 Cincinnati Childrens Hospital Medical Center, Cincinnati, United States, 4 Stanford University, CA, United States, 5 E-TROLZ, Inc, Andover, MA, United States

To restore high fidelity 12-lead ECG traces acquired during high-duty-cycle MR imaging sequences, we developed techniques to restore ECGs distorted by gradient-induced voltages. We developed a system response function which characterized induced voltages at each channel based on simultaneously recorded gradient waveforms. We then measured gradient-induced voltages in volunteers at spectrum and amplitude up to 24 KHz and +/-10Volt, and demonstrated close agreement between the theoretical and measured gradient-induced voltages. A rapid training sequence permitted computing the response function coefficients, followed by real-time gradient-induced voltage removal during imaging. The response function coefficients varied by subject, sequences parameters, and slice orientation.

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