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Abstract #3262

Contact-free Cardiac Motion Estimation using the Scatter of a Parallel Transmit Coil at 7T MRI

Sven H.F. Jaeschke1, Caitlin O'Brien2, Aaron T. Hess1, and Matthew D. Robson1

1Oxford Centre for Clinical Magnetic Resonance Research, University of Oxford, Oxford, United Kingdom, 2Oxford Centre for Functional MRI of the Brain, University of Oxford, United Kingdom

Cardiovascular MRI at ultra-high field strength is a growing field of research and as such there is a need for reliable, accurate, and user-independent triggering and gating. We propose a novel approach that uses directional couplers from the SAR monitoring system and an 8-channel pTx coil to measure the reflection coefficients simultaneously to determine cardiac motion with an independent component analysis and Gaussian shaped RF-monitoring pulses. This approach has the potential to improve cardiac imaging at ultra-high field CMR by providing robust triggering in periods of breath-hold and free-breathing, additional gating information and an optimised workflow with no additional set-up.

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