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Comparison of 3DQRS and VCG Approaches for MR Gating in 1.5T, 3T & 7T MRIs

Institution:
1College of Engineering, University of Georgia, Athens, GA, USA.
2Department of Radiology, Brigham and Women’s Hospital, Boston, MA, USA.
Publication Date:
May-2014
Citation:
The International Society for Magnetic Resonance in Medicine 22nd Scientific Meeting & Exhibition, 2014 May, Milan, Italy.
Appears in Collections:
ISMRM
Generated Citation:
Gregory T.S., Schmidt E.J., Zhang S.H., Tse Z. Comparison of 3DQRS and VCG Approaches for MR Gating in 1.5T, 3T & 7T MRIs. The International Society for Magnetic Resonance in Medicine 22nd Scientific Meeting & Exhibition, 2014 May, Milan, Italy.
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During cardiac MR imaging, blood plasma electrolytes ejected into the aorta during early systole interact with the strong magnetic field of the MR scanner to produce a Magnetohydrodynamic (MHD) effect. Electrocardiograms (ECG) recorded in the presence of this magnetic field are overlaid with a MHD-induced voltage (VMHD)1. Intermittent QRS detection and MRI gating are resulted, despite the use of Vectorcardiogram (VCG) based gating approaches in most MRI scanners2, especially at high field strengths3. A multiple channel ECG-based cross-correlation algorithm, the 3DQRS, has been developed to achieve increased sensitivity in QRS detection at high field strengths4. 3DQRS utilizes a 3-D ECG representation, whereas the third dimension, in addition to voltage and time, is deemed a channels axis, formed from concurrent viewing of the precordial leads V1-V6 (Fig.1). A quantitative comparison of the 3DQRS method and a VCG- based approach at 1.5T, 3T and 7T field strengths was performed on 15 human subjects as an assessment of robustness.

Additional Material
1 File (147.386kB)
Gregory-ISMRM2014-fig1.jpg (147.386kB)