Population Mask Over-crop


Dear MRtrix experts,

I am doing a population analysis with more than 100 subjects and the population mask turned up to be over-cropped since my research team only have single shell data which is (1s b=0 and 64s b=1000).

For my case, it over-cropped part of the corpus-callosum and thalamus.

Do we have any better solution or threshold can be set for this?