Hi Neda V1 is a vector so it should have 3 volumes (cartesian coordinates). Please go through the online FSL documentation/practical and relevant dti papers to get a feeling of what the outputs of dtifit mean. Cheers Stam On 16 Jan 2014, at 10:18, Neda Mohammadi <[log in to unmask]> wrote: > Hi dear all, > > I run dtifit on my data but I see FA+V1 in fslview with 3 volume > while I have 62 volume (31 direction and average=2) in my data. > Is it wrong? > > For registration in terminal with cammands line what should I write command? > > Best, > Neda