Figure 7. GTV - 4 mm DeIIV as a function of GTV and GTV coverage value by GTV - 4 mm DeIIV.

The scatter plots show the correlations between the GTVs and the GTV - 4 mm D_eIIV relative to the GTV D_{V-0.01 cc} (A); and the GTV coverage values by the GTV - 4 mm D_eIIV (B). The result of SRCC is added in A.

GTV: Gross tumor volume; GTV - 4 mm: Gross tumor volume evenly reduced by 4 mm; D_eIIV: A minimum dose to cover the irradiated isodose volume equivalent to a target volume on the dose-volume histogram; D_{V-0.01 cc}: A minimum dose to cover a target volume minus 0.01 cc; SRCC: Spearman’s rank correlation coefficient