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
Radiology, Stanford University, Stanford,
CA, United States,
Engineering, Stanford University, Stanford, CA, United
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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