wrong streamline direction

Dear Mrtrix Experts,

I used mrtrix to do whole brain tractography and below are some of the results:

  1. response function after msmt-csd
  2. fiber orientation direction
  3. streamline using 2nd integration (default tckgen method)
  4. extract corpus callosum using tckedit

    This streamline direction looks wrong but i do not know what the reason could be. Looking forward to hearing from you.

Thanks for your help.
Best,
Lynn