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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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