Hi Rick,
Just checking in on this again. I've attached an image of the volreg overlay on the anat final. If I'm interpreting correctly, I would think that the voxels that would be most affected by the extents mask would be the voxels near the outer boundary box of the EPI, rather than all voxels outside of the brain (yellow/blue voxels). Do you find it concerning that such a large number of voxels (~15%) in the EPI dataset are constant?
Thank you!
Jenna
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