Figure 2. Comparisons of the GTV dose inhomogeneity and conformity.

The images show box-and-whisker plots (BWPs) along with the results of Friedman’s test (FT), Scheffe’s post hoc test (SPHT), and Wilcoxon signed-rank test (WSRT) (A, B); the GTV D_{V-0.01 cc} (%) relative to the GTV D_{0.01 cc} (100%) to indicate the dose inhomogeneity (A); and the spillage volume (cc) of the irradiated isodose volume (IIV) of GTV D_{V-0.01 cc} outside the GTV to demonstrate the dose conformity (B).

GTV: gross tumor volume; D_{V-0.01 cc}: a minimum dose to cover a target volume (TV) minus 0.01 cc (D_>95% for TV >0.20 cc, D_95% for TV ≤0.20 cc); IDS: isodose surface; PIV: prescribed isodose volume; WSRT: Wilcoxon signed-rank test; CA: coplanar arcs; NCA_L: non-coplanar arcs with limited rotations; NCA_F: non-coplanar arcs with full rotations; D_{0.01 cc}: a minimum dose covering 0.01 cc of a TV (D_{0.01 cc} for TV ≥0.20 cc and D_5% (D_{<0.01 cc}) for TV <0.20 cc).