Nonrigid Autofocus Motion Correction for Coronary MR Angiography with a 3D Cones Trajectory
R Reeve Ingle 1 , Holden H. Wu 2 , Nii Okai Addy 1 , Jieying Luo 1 , Joseph Y. Cheng 1 , Phillip C. Yang 3 , Bob S Hu 1,4 , and Dwight G Nishimura 1
Electrical Engineering, Stanford University,
Stanford, California, United States,
Sciences, UCLA, California, United States,
Medicine, Stanford University, Stanford, California,
Alto Medical Foundation, Palo Alto, California, United
A nonrigid autofocus motion correction technique is
presented for coronary magnetic resonance angiography (CMRA)
using a free-breathing 3D cones non-Cartesian sequence.
Translational motion measurements from 2D or 3D image
navigators are used to derive a set of candidate motion
trajectories. A bank of motion-compensated CMRA images
is generated using these candidate trajectories, and a
focusing metric is used to reconstruct the final image
by selecting the best-focused pixels. The proposed
technique is shown to improve the depiction of coronary
arteries in volunteer and patient studies.
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