Abstract #1851

Three dimensional retrospective motion correction using spherical navigator echoes

Patricia M Johnson^1,2, Junmin Liu¹, Trevor Wade¹, and Maria Drangova^1,2

¹Robarts Research Institute, London, ON, Canada, ²Department of Medical Biophysics, Schulich School of Medicine & Dentistry, London, ON, Canada

Spherical navigators are k-space navigators that can measure 6-degree of freedom rigid-body motion. Recent developments have reduced processing and baseline acquisition time, making the technique a promising tool for motion correction. This work represents the first time SNAVs have been incorporated into an image sequence and demonstrated for motion correction. SNAVs were incorporated into a gradient echo sequence; this navigated sequence was used to scan 3 volunteers performing directed head motion. The motion-degraded brain images were then retrospectively corrected using the SNAV derived motion parameters. In all cases excellent correction of motion artifacts was observed.

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