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Abstract #2563

Six-degree of Freedom Retrospective Motion Correction using Spherical Navigator Echoes (SNAV)

Patricia Johnson 1,2 , Junmin Liu 1 , Trevor Wade 1 , and Maria Drangova 1,2

1 Imaging Research Laboratories, Robarts Research Institute, London, Ontario, Canada, 2 Dept. of Medical Biophysics, Schulich School of Medicine & Dentistry, Western University, London, Ontario, Canada

Spherical navigator echo (SNAV) techniques are promising for measuring rigid body motion in all 6 degrees of freedom. In this abstract we demonstrate for the first time - the accuracy of retrospective preRot-SNAV-correction of motion by interleaving the SNAVs within a 3D imaging pulse sequence (efgre-SNAV). We have performed a preliminary evaluation of this sequence and determined that the interleaved SNAVs perform comparably to stand alone SNAVs in measurements of rotation and translations; they agree within 1.0 and 0.43mm. We have also demonstrated successful retrospective correction of a phantom image.

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