HI there, 

Does anyone have a suggestion on how to map the uncinate fasciculus on DTI (single subject). I preprocessed our DTI images on FSL and am trying to use TrackVis to see the tracks. Although I can see the corpus callosum and corticospinal tracts nicely, I cannot seems to see the uncinate fasciculus despite using variously sized and positioned ROIs. 

Any help would be greatly appreciated!

Ben

Hi Ben
The uncinate should actually be fairly easy to track (though I am not too familiar with TrackVis, I do my tracking in Slicer). The problem is one of specificity, i.e. to place an ROI such that you only get the uncinate and nothing else is very difficult. I suggest you get a set of tracts first that includes the uncinate and then clean the tracks up afterwards (Slicer has a handy, interactive fiber selection/cleaning tool). For that, I usually place ROI either a) very generously in the anterior temporal lobe, or b) place an ROI is the up-down-ward region medial-anterior temporal lobe; if you look at the color coded FA image, you can see that as a small blue region in the medial & anterior temporal lobe. Option b is the most effective.
Hope this helps
Martin