Complex Fiber Tracking

Hello All, I wanted to post just to see if anyone has any insight on an effective method for generating complex fiber tracts (i.e. crossing fibers, specifically those of the dentatothalamic tract OR any tract that has a contralateral characteristic). When I conduct the tractography via tckgen I manage to only acquire a tractogram with the majority of the streamlines emanating from the seed point in the dentate nuclei but mainly doing so on the ipsilateral side as oppose to the expected contralateral tracts. Any insight would be greatly appreciated.