Nope, you can do the tractography directly from the surfaces using FSL:
https://fsl.fmrib.ox.ac.uk/fsl/fslwiki/FDT/UserGuide#Using_surfaces Use the
surfaces in ${StudyFolder}/${Subject}/T1w/fsaverage_LR32k. White surfaces are
good for counting and pial surfaces are good for stopping. There
Dear HCP team,
We are interested in using both task fMRI and diffusion MRI data to study
white matter pathways between functional cortical regions. We are planning
to use task fMRI activation to define several ROIs as seeds for dMRI
tractography. We have several questions below and hope someone
