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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