Abstract #2549
Comparison of 3DQRS and VCG Approaches for MR Gating in 1.5T, 3T & 7T MRIs
T. Stan Gregory 1 , Ehud J Schmidt 2 , Shelley Hualei Zhang 2 , and Zion Tsz Ho Tse 1
1
University of Georgia, Athens, GA, United
States,
2
Brigham
and Women's Hospital, Boston, MA, United States
Blood plasma electrolytes ejected into the aorta during
early systole interact with the strong magnetic field of
the MR scanner to produce a Magnetohydrodynamic-induced
voltage (VMHD). Electrocardiograms (ECG) recorded in the
presence of this magnetic field are overlaid with VMHD.
Resultant intermittent QRS detection is conventionally
compensated for by Vectorcardiogram (VCG) based gating
approaches. A multiple channel ECG-based
cross-correlation algorithm, the 3DQRS, has been
recently developed to achieve increased sensitivity in
QRS detection at high field strengths. A quantitative
comparison of the 3DQRS method and a VCG-based approach
at varying MRI field strengths was performed as an
assessment of robustness.
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