I am following the FBA tutorial. After tckgen and tcksift steps, I find my tractography result is bad, the fibre tract does not fill whole brain. There are just few tracts in cerebellum. Could you please help me to figure out what should I do?
The below is the code what I used:
tckgen -angle 22.5 -maxlen 250 -minlen 10 -power 1.0 wmfod_template.mif.gz -seed_image voxel_mask.mif -mask voxel_mask.mif -select 20000000 tracks_20_million.tck -force -nthreads 8
tcksift tracks_20_million.tck wmfod_template.mif.gz tracks_2_million_sift.tck -term_number 2000000 -force -nthreads 8
The figure is the tracks_2_million_sift.tck: