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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