Abstract #1519

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

Bruce Langford¹, Thomas Neuberger^2,3, and Paul Bartell^1,4

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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