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Hi Andy, You can enter your targets as a list of "classification targets" (or the options --targetmasks and --os2t on the command line) The results will be stored in files called seeds_to_<target> (one per target). These report, for each seed voxel, the number of samples that reached each target. You can then calculate summary stats from these using fslstats. Cheers, Saad. On 18 Nov 2009, at 10:00, cheng andy wrote: > Hi, all > > I have a question about probtrackx: If I have a seed mask, and > several target masks, > How can I get the fiber numbers passing through each target mask > from the seed samples? > Which option should I choose in the probtrackx? > Thanks in advance! > > Andy -- Saad Jbabdi University of Oxford, FMRIB Centre JR Hospital, Headington, OX3 9DU, UK +44 (0) 1865 222466 (fax 717) www.fmrib.ox.ac.uk/~saad