fMRIPREP + TEDANA Status of things as of April 2019?

[agnesnorbury]

Update: I found some helpful info about this issue here:

Blipup Blipdown distortion correction on multiecho data

I’d recommend applying the same spatial transform to each echo. A fundamental assumption of multi-echo analyses is that the data in each voxel represents the same underlying anatomical volume, just at a different echo time. Applying different spatial transforms to each echo would violate that assumption. That said, spatial distortion can increase with echo time, which would also violate that assumption. A blipup blipdown correct might be able to correct for this issue and actually result in mor…

It seems that although B0 spatial distortion may vary with echo time (depending on sequence), the currently recommended approach is to use a single transform (e.g. echo-1) for all images.

(sorry - I previously searched pepolar so rather than blip so missed this response!)