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Abstract #1301

3D Motion Estimation of Head Using Three Orthogonal Navigator Echoes and Coil Sensitivity Profiles

Jiaen Liu1, Peter van Gelderen1, Jacco de Zwart1, and Jeff Duyn1

1National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD, United States

Subject motion is a common source of artifact in MRI scans. Various navigator techniques have been developed to monitor motion and correct motion artifacts. In this study, a new approach was developed to extract 3D motion information of the head based on three orthogonal 1D gradient-encoded echoes acquired in about 2 ms. Complementary positional information carried by the individual sensitivity profiles of a receive array was exploited. The method was evaluated in experiments. It suggested the estimated motion parameters were within ±0.5° and ±0.5 mm accuracy in reference to co-registered head images in various positions with rotations up to ±4°.

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