afni.nimh.nih.gov

Hi Haisam,

Sure, you can use 3dcalc with differential subscripts.
For example, to get d[t+1]-d[t] for all voxels, try:

3dcalc -a epi+orig -b a+l -expr b-a -prefix deriv

Note also that you can use 't' in the expression.

See "3dcalc -help", under "DIFFERENTIAL SUBSCRIPTS"
for details.

- rick