Figure 8.

DVH for targets and normal liver in Lesion E: (a) GTV, (b) ITV, (c) PTV, and (d) normal liver. Various numbers of phases ($\mathrm{p}=2,3,5_{\text{even}},5_{\text{odd}}$, and 10) were used for the 4D dose calculation. The 3D dose calculation is depicted as a black line and the 4D dose calculation as colored lines; $\mathrm{p}=2$ phases (red); $\mathrm{p}=3$ (orange); $\mathrm{p}=5_{\text{even}}$ (orange); $\mathrm{p}=5_{\text{odd}}$ (green); $\mathrm{p}=10$ (blue). The inset figures show the ratio of fractional volume relative to the $4{\mathrm{D}}_{\mathrm{p}=10}$ calculation over the ${\mathrm{D}}_{98}$ to ${\mathrm{D}}_{50}$ interval derived from the $4{\mathrm{D}}_{\mathrm{p}=2}$ PTV and normal liver histograms.