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Abstract #0025

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

1 Electrical Engineering, Stanford University, Stanford, California, United States, 2 Radiological Sciences, UCLA, California, United States, 3 Cardiovascular Medicine, Stanford University, Stanford, California, United States, 4 Palo Alto Medical Foundation, Palo Alto, California, United States

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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