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Abstract #0338

High frequency orientation estimates for fast real-time motion correction using vector observations of gravity and the static magnetic field (B0).

Adam M.J. van Niekerk1, Paul Wighton2,3, Ali Alhamud1, Matthew D. Tisdall2,3, Andre J.W. van der Kouwe2,3, and Ernesta M. Meintjes1

1Human Biology, MRC/UCT Medical Imaging Research Unit, University of Cape Town, Cape Town, South Africa, 2Athinoula A. Martinos Center, Massachusetts General Hospital, Boston, MA, United States, 3Radiology, Harvard Medical School, Boston, MA, United States

In this study we propose a novel approach to motion correction in MRI that separates the challenges of tracking orientation and translation. We developed an external hardware device capable of high frequency orientation estimates independent of the pulse sequence. The device takes vector observations of gravity and the MRI scanner’s static magnetic field (B0) and is therefore free from many constraints of some existing external motion tracking techniques. Most notably, no scanner specific calibration is required and the device can be miniaturised. Translation estimates are achieved through the use of 3 high-speed orthogonal navigators. Line by line rigid body motion correction is implemented in a spoiled gradient echo pulse sequence.

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