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Abstract #4010

Reducing the effects of under-sampling in images acquired with a 3D radial sequence for the purposes of real-time navigation.

Leah Morgan1, Ernesta Meintjes1, and Andre van der Kouwe1,2

1Division of Biomedical Engineering, Department of Human Biology, University of Cape Town, Cape Town, South Africa, 2Department of Radiology, Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Boston, MA, United States

Radial sequences hold great potential for real-time navigation in MRI. Navigator images can be produced off very few spokes of sampled data however, characteristic streaking artifacts appear due to under-sampling at the outer edges of the k-space field of view. In this study, a method is proposed to reconstruct navigator images with a reduced base resolution to minimize the effects of under sampling and reduce the appearance of streaking artifacts, improving the accuracy of motion-registration. The success of this method supports the pursuit of radial sequences for applications in real-time navigation.

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