Figure 7.

The performance of 4D-CT reconstruction from a simulated free-breathing 3D-CT. A planning day 4D-CT is first obtained, with its maximum inhale, middle, and maximum exhale phases shown in (a). The simulated treatment day 4D-CT is displayed in (b), along with a simulated free-breathing 3D-CT of the treatment day shown in (c). The registration results between the planning day 4D-CT and the free-breathing 3D-CT by diffeomorphic Demons and SyN are shown in (d) and (f), with their difference images with respect to ground-truth (b) displayed in (e) and (g), respectively. The reconstruction results by our method without/with temporal guidance are displayed in (h) and (i), along with their corresponding difference images with respect to the ground-truth (b) shown in (i) and (k), respectively.