Hi there, wonder if someone could help me out

We obtained EPI images in a GE MR scanner with opposite phase encoding direction in order to construct a B0 inhomogeneity fieldmap using the topup command in FSL. The problem is that the fieldmaps obtained show some kind of artifact represented by vertical lines in the phase encoding direction (A-P).

Does anyone know why these artifact is observed and how to prevent or correct it?

I appreciate your kind help.

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