Patricia M Johnson1,2, Junmin Liu1, Trevor Wade1, and Maria Drangova1,2
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.