# calculate vf from phase to midp, using the vf from reference phase to midp (-i)
# and the vf from reference phase to phase (-j)
clitkComposeVF -i $ref_vf_midp -j $vf_dir/vf_$ref_phase_nb\_$phase_nb.mhd -o $vf_midp
# calculate vf from phase to midp, using the vf from reference phase to midp (-i)
# and the vf from reference phase to phase (-j)
clitkComposeVF -i $ref_vf_midp -j $vf_dir/vf_$ref_phase_nb\_$phase_nb.mhd -o $vf_midp