I created some datasets in matlab that are now "abuc" buckets. I want to warp them to MNI space using external software (ANTS, but I've read about people having similar problems with bioimagesuite and fsl). The problem is that most Nifti-aware software expects a 4D dataset to be a different format. I'm unable to get the whole 4D dataset to warp correctly. Based on this webpage:

[nifti.nimh.nih.gov]

it seems to me that my data as an abuc is concatenated in the FIFTH DIMENSION (wow man) when it should be in the fourth dimension, as in 3d+time. As a workaround, I tried using fslsplit to chop up my data temporarily into 3d files, but that doesn't work either for the same reason - it expects the "time dimension" to be in the fourth slot not the fifth.

I can think of two possible solutions, but I don't know how to do either of them.

1) Could I "convert" an abuc dataset into a 3d+time dataset? Is there an easy way to do that? Wouid I have to resort to to3d? (shudders)
2) Is there a way to "split" an abuc dataset into 3d files, so I can warp them individually and then reassemble them into a 4D nifti dataset?