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Abstract #1519

A method for identifying and fixing faulty navigator corrections in system-reconstructed multi-shot 3D diffusion weighted images

Bruce Langford1, Thomas Neuberger2,3, and Paul Bartell1,4

1Department of Animal Science, The Pennsylvania State University, University Park, PA, United States, 2Department of Biomedical Engineering, The Pennsylvania State University, University Park, PA, United States, 3Huck Institutes of the Life Sciences, The Pennsylvania State University, 4Interdepartmental Graduate Program in Neuroscience, The Pennsylvania State University

Unusual artifacts appear in some reconstructed images of a multi-segment 3D EPI-DTI sequence with navigator correction on a 7T Bruker Biospec system running Paravision 6.1. Navigator helps to compensate for subject movement within the scanner. However, by examining the k-space of the system processed volumes and the raw navigator data, the artifacts were attributed to navigator overcompensation, which resulted in the over representation of a few lines in k-space. After zeroing the affected lines, image quality was on par with other volumes with no artifacts, eliminating the need to rescan subjects.

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