I am just learning how to parcellate thalamus into nucleus. In the FSL software, I know that we will obtain some "seeds_to_cortex_average_*_right.nii.gz" files after probabilistic tractography. These files record the number of streamline from each voxels in thalamus to the corresponding cortex. Then we can fed these files into find_the_biggest code to obtain the result of thalamus parcellation. Of course, we can also complete thalamus parcellation with threshold-based approach than this hard-segmentation approach. But anyway we need to get the files that record the number of streamline from each voxels in thalamus to cortex. The problem I have is that I want to use other fiber tracking methods to parcllate thalamus, for example I want to use approach in MRtrix3 to do it, but I don't know how to obtain the files recording the number of streamline like "seeds_to_cortex_average_*_right.nii.gz" files. So the question I want to ask is whether there is a code that can directly obtain file like "seeds_to_cortex_average_*_right.nii.gz" in MRtrix3 software (I have not found the corresponding code)? If not, how do we get the file? Do we need to rewrite the code ourself?

I will appreciate it if you could help me! It will help me a lot in my study! Thanks!