Abstract #3352

Segmented Twin-resolution Acquisition of Cones Trajectory (STACY) and Coalesced Image Navigator for Free-breathing Cardiac MRI

Kwang Eun Jang^1,2, Dwight G Nishimura³, and Shreyas S Vasanawala⁴

¹Magnetic Resonance Systems Research Lab (MRSRL), Stanford University, Stanford, CA, United States, ²Department of Bioengineering, Stanford University, Stanford, CA, United States, ³Magnetic Resonance Systems Research Lab (MRSRL), Department of Electrical Engineering, Stanford University, Stanford, CA, United States, ⁴Department of Radiology, Stanford University, Stanford, CA, United States

3D image-based navigators (iNAVs) are effective for tracking motion in free-breathing cardiac MRI, though they require a long acquisition window. In this work, we present Segmented Twin-resolution Acquisition of Cones trajectorY (STACY) and the concept of coalesced image navigators. In STACY, different segments of a 3D low-resolution cones trajectory are collected across heartbeats as navigators. Coalesced image navigators are reconstructed by merging data from similarly translated heartbeatsh, leading to better conditioned images than iNAVs from undersampled data collected over individual heartbeats.

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