Hi, My question is about drawing ROIs. After running TBSS I would like to extract FA values from the internal capsule tract. If I use fslroi I can only select a rectangular ROI which often includes parts of other tracts as well. What is the best way to define a ROI containing one specific tract, without the involvement of adjacent tracts? Thanks, Janneke Schuurman Department of Psychiatry and Neurology VU University Medical Center, Amsterdam