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Abstract #2572

3D Free-breathing Abdominal MRI using Robust Navigator Processing with Coil Clustering

Tao Zhang 1,2 , Joseph Y Cheng 1,2 , Yuxin Chen 2 , John M Pauly 2 , and Shreyas S Vasanawala 1

1 Radiology, Stanford University, Stanford, CA, United States, 2 Electrical Engineering, Stanford University, Stanford, CA, United States

Abdominal MRI is often limited by respiratory motion. Some acquisition trajectories, such as modified Cartesian and radial, can provide self-navigating signals during data acquisition. This enables retrospective motion compensation (MC). With phased array coils, navigators can be acquired for each coil element. Since navigators from different coil elements track motion in local regions that can vary significantly, averaging navigators from all coils sometimes yields inaccurate respiration estimation, and therefore ineffective MC. Here, a robust navigator processing method using coil clustering is described, implemented, and validated. The proposed method automatically selects the appropriate navigators for MC from coil arrays.

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