Novel Motion Correction Technique Using Orbital Navigator Echoes in Interleaved Spiral Imaging

Spiral imaging does not produce apparent flow artifacts. However, it remains sensitive to rapid rigid body motion. In this abstract, a motion correction technique using an orbital navigator “ring” in interleaved spiral imaging is presented. In this technique, a circular k-space trajectory is incorporated into each spiral interleaf. Data inconsistency due to both rotation and translation can be corrected by evaluating the magnitudes and phases of the data of the navigator “ring”. This motion correction technique is combined with an automatic field map generation method, such that no additional scanning is necessary for off-resonance correction.