Not directly; that is, there is no program for that purpose. You could approximate such a mask in several ways, but it would depend on how accurate you needed it and how much suffering/experimentation you were willing to undertake.
The most straightforward way might be to register the EPI to the TT_EPI+tlrc dataset with @auto_tlrc. Then use the Talairach atlas white matter mask, and back transform it to the +orig space (or operate entirely in +tlrc space). This would be crude, and not subject specific.
More elaborate methods could be devised, but I won't go on about them because my guess is that you want a pre-packaged solution, not a "try something like this and see what it looks like" suggestion.
