-6-
²Examination of time series fred2_epi+orig and fred2_epi_vr_+orig shows that head
movement up and down happened within about 1 TR interval
åAssumption of rigid motion
of 3D volumes is not good for this case
åCan do 2D slice-wise
registration with command
2dImReg
-input fred2_epi+orig \
-basefile
fred1_epi+orig \
-base 4
-prefix fred2_epi_2Dreg
²Graphs of a
single voxel time series near the edge of the brain:
åTop = slice-wise alignment
åMiddle = volume-wise adjustment
åBottom = no alignment
²For this example, 2dImReg appears to produce better
results. This is because most of the motion
is Ôhead noddingÕ and the acquisition is sagittal
²You should also use AFNI to scroll
through the
images (using the Index control) during the period of pronounced movement, on all 3 datasets
fred1_epi registered with
2dImReg
fred1_epi registered with
3dvolreg
fred1_epi
unregistered