Thanks Rick,
I believe that should work. But because our dicom images are not named that perfect, it will probably take the same effort as to extract time offset from the last image to a file and use the @filename option in to3d for automating everything. Anyway I suggest adding an option to specify which dicom to use (second, last, etc.) in to3d if you have spare time in future. This should also save problems for other users of the same multiband sequence who may not notice it.
Mingbo