Dear Maria,
the SPM Diffusion toolbox provides only a not very sophisticated
tracking algorithm. If you want to do tractography (both streamline and
probabilistic) and get the results as NIfTI, I would suggest looking at
the DTI and Fibertools developed at the MR Physics department in Freiburg:
http://www.uniklinik-freiburg.de/mr/live/arbeitsgruppen/diffusion/fibertools_en.html
These tools use their own internal data format (called mrStruct), but
results, mask images etc. can be converted between NIfTI and mrStruct.
These tools can be integrated with the SPM8 batch system.
The only limitation is that you have to import your DWI data directly
from DICOM (i.e. you can't use Diffusion Toolbox for spatial preprocessing).
Hope this helps,
Volkmar
<https://www.jiscmail.ac.uk/cgi-bin/webadmin?A2=SPM;5637c12f.1003>
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