Dear Andreas,
Please forgive me for the extreme delay in response...
The original data from the scanner looks similar. After posting, my initial thought was that this was an isolated artifact in the b=0 image I was using as a reference - and that the subsequent nodif_brain_mask file was eliminating any FA signal down the analysis pipeline. However, it seems as if every slice in my raw data set (both b=0 and b=1000) includes this artifact.
DP
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