Fig. 2.

Sagittal views for the head-and-neck cancer patient H24 of: (1st row) CBCT (1st column), CT (2nd column), rescan CT (rCT, 3rd column) and synthetic CT (sCT, 4th column), along with (2nd row) the respective difference to rCT, and the doses (3rd row). The red, black, or green dotted rectangles indicate the position of ${\mathrm{Mask}}_{\mathrm{CBCT}}$. The days refer to the acquisition date relative of the planning CT. In the 4th row, the DVH is shown for target and OARs of sCT (solid lines) and rCT (dashed lines). Note that for the clinical target volume (CTV) of the node (CTVnode) and the right (R) submandibular, the DVH differed between rCT and sCT. This is due to anatomical differences between sCT and rCT.