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ECG Triggering in Ultra-High Field Cardiovascular MRI.


ABSTRACT: Cardiac magnetic resonance imaging at ultra-high field (B0 ? 7 T) potentially provides improved resolution and new opportunities for tissue characterization. Although an accurate synchronization of the acquisition to the cardiac cycle is essential, electrocardiogram (ECG) triggering at ultra-high field can be significantly impacted by the magnetohydrodynamic (MHD) effect. Blood flow within a static magnetic field induces a voltage, which superimposes the ECG and often affects the recognition of the R-wave. The MHD effect scales with B0 and is particularly pronounced at ultra-high field creating triggering-related image artifacts. Here, we investigated the performance of a conventional 3-lead ECG trigger device and a state-of-the-art trigger algorithm for cardiac ECG synchronization at 7 T. We show that by appropriate subject preparation and by including a learning phase for the R-wave detection outside of the magnetic field, reliable ECG triggering is feasible in healthy subjects at 7 T without additional equipment. Ultra-high field cardiac imaging was performed with the ECG signal and the trigger events recorded in 8 healthy subjects. Despite severe ECG signal distortions, synchronized imaging was successfully performed. Recorded ECG signals, vectorcardiograms, and large consistency in trigger event spacing indicate high accuracy for R-wave detection.

SUBMITTER: Stab D 

PROVIDER: S-EPMC6024401 | biostudies-literature | 2016 Sep

REPOSITORIES: biostudies-literature

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ECG Triggering in Ultra-High Field Cardiovascular MRI.

Stäb Daniel D   Roessler Juergen J   O'Brien Kieran K   Hamilton-Craig Christian C   Barth Markus M  

Tomography (Ann Arbor, Mich.) 20160901 3


Cardiac magnetic resonance imaging at ultra-high field (B<sub>0</sub> ≥ 7 T) potentially provides improved resolution and new opportunities for tissue characterization. Although an accurate synchronization of the acquisition to the cardiac cycle is essential, electrocardiogram (ECG) triggering at ultra-high field can be significantly impacted by the magnetohydrodynamic (MHD) effect. Blood flow within a static magnetic field induces a voltage, which superimposes the ECG and often affects the reco  ...[more]

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