Example GUI view

Displaying DWI images in fslview

Outputs of Bedpost or DtiFit can be conveniently displayed in fslview. If you open an image of diffusion vectors (e.g., dtifit_V1 output of DtiFit or dyads<i> output of Bedpost) then it is possible to display these vectors using RGB coding (where the colours red,green and blue represent diffusion in the x,y,z axes respectively) or using lines where a line at each voxel represent the principle diffusion direction at that voxel.
It is also possible to display multiple lines per voxel. Each line will be displayed in a different colour.
If you only want to visualise fibres within voxels where multiple fibres are supported (e.g. above a certain threshold for the corresponding mean_fsamples), then you first have to create a vector file where the voxels below a certain f-threshold are zeroed. You may use the two following commands for that:

fslmaths mean_fisamples -thr 0.05 -bin tmpmask
fslmaths dyadsi -mas tmpmask dyadsi_masked

For more details see the relevant fslview tutorial.