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Abstract #5307

Free breathing, multi-shot real-time imaging using adaptive k-space sampling (ARKS) for iCMR

Nuri Chung1, Ana Rodriguez-Soto2, Sanjeet Hegde3, Eleanor L. Schuchardt3, Brent M. Gordon3, Ileen Cronin3, and Francisco Contijoch1,2
1Bioengineering, University of California San Diego, La Jolla, CA, United States, 2Radiology, University of California San Diego, La Jolla, CA, United States, 3Pediatrics, Rady Children's Hospital-San Diego, Heart Institute, San Diego, CA, United States

Synopsis

Keywords: Cardiovascular, HeartAdaptive k-space sampling (ARKS) enables real-time multi-shot imaging by quickly finding data acquired during similar cardiac phases1. In this study, we used pediatric physiologic signals to simulate ARKS and extended the approach to incorporate respiratory gating and enable free breathing acquisition. Respiratory gating was performed by cross-correlating the recent respiratory signal with previously acquired values. A correlation cutoff was used to select similar periods. As expected, higher correlation cutoffs led to lower acceptance rates. For a search period of 32 beats, respiratory gating with a correlation cutoff of 0.5 identified 6 heartbeats for multi-beat imaging.

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Keywords