(a)
(b)
(c)
Figure 1: Example of misregistration caused by motion:
(a) pre-contrast image, (b) post-contrast image and (c) after subtracting
(a) from (b) without registration.
(a)
(b)
(c)
(d)
(e)
(f)
Figure 2: Example of different transformations on the registration
of the patient in Figure 1: After (a) rigid, (b) affine and (c)
non-rigid registration. The corresponding difference images are shown in
(d) - (f).