I’ve been running fMRIPREP with fieldmap data to include susceptibility distortion correction (SDC) and have a few questions about the output of susceptibility distortion correction.
I’m not sure how the SDC output is supposed to look like as this is my first time running fMRIPREP with field map data. Below is what I’ve got from one participant:
It seems that these blue and red lines are causing more distortion (like dragging the bottom parts of brain to the left) in EPI data which field map data were applied to. This looks a bit problematic as the distorted EPI images are not aligned well with ANAT.
Here’s the ANAT images from the same participant’s html report:
And EPI images:
So I was wondering if this dragging issue is normal after SDC?
I’d really appreciate your help or comments. Thank you.