Abstract #0783

Image-Based Non-Rigid Motion Correction for Free-breathing 4D MR Angiography

Fei Han¹, Ziwu Zhou¹, Paul J Finn¹, and Peng Hu¹

¹Radiology, University of California, Los Angeles, Los Angeles, CA, United States

Cardiac-phase-resolved 4D MR angiography (MRA) is a promising technique for evaluating patients with cardiovascular disorder. However, current approaches usually has low scan efficiency (20-40%) due to the gating based respiratory motion compensation and therefore suffered from prolonged yet unpredictable scan time. In this work, we proposed a motion correction strategy in which complex non-rigid respiratory motion is modeled using voxel-based linear translations, which are estimated using 3D image registration. Our preliminary result shows that the proposed technique could compensate for complex motion across the large field-of-view of 4D MRA and potentially improve the scan efficiency by including more k-space data in the reconstruction.

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