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Retrospective motion compensation using variable‐density spiral trajectories
Author(s) -
Leung General,
Plewes Donald B.
Publication year - 2005
Publication title -
journal of magnetic resonance imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.563
H-Index - 160
eISSN - 1522-2586
pISSN - 1053-1807
DOI - 10.1002/jmri.20388
Subject(s) - trajectory , imaging phantom , motion (physics) , motion compensation , spiral (railway) , computer science , physics , computer vision , optics , mathematics , mathematical analysis , astronomy
Purpose To develop a method of retrospectively correcting for motion artifacts using a variable‐density spiral (VDS) trajectory. Materials and Methods Each VDS interleaf was designed to adequately sample the same center region of k‐space. This central overlapping region can then be used to measure rigid body motion between the acquisition of each VDS interleaf. By applying appropriate phase shifts and rotations of the k‐space data, rigid body motion artifacts can be removed, resulting in images with less motion corruption. Results Both phantom and volunteer experiments are shown, demonstrating the technique's ability to further reduce artifacts in images acquired with an already motion‐resistant acquisition trajectory. Registration accuracy is highly dependent on the trajectory design parameters. This space was explored to find an optimal design of VDS trajectories for motion compensation. Conclusion Using appropriately designed VDS trajectories, residual motion artifacts can be significantly reduced by retrospectively correcting for in‐plane rigid body motion. An overlapping region of approximately 8% of the central region of k‐space and approximately 70 interleaves were found to be near‐optimal parameters for retrospective correction using VDS trajectories. J. Magn. Reson. Imaging 2005. © 2005 Wiley‐Liss, Inc.