Fig. 1.

Sub-division of CTVv for non-rigid assessment of internal motion; a) Anterior and posterior wall and b) Right and left wall, both on axial view, c) Anterior and posterior wall on sagittal view and d) Right and left wall on coronal view. Anterior wall = blue, posterior = red, right = turquoise and left = purple. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)