Figure 6. GTV near-minimum dose relative to GTV near-maximum dose as a function of GTV.

The scatter plots show the correlations of the GTVs and the near-minimum doses of the GTVs, D_{V-0.01 cc} (%), relative to the near-maximum doses of the GTVs, D_{0.01 cc} (A, B). The GTVs are limited to ≤4.5 cc in B. The result of SRCC is added in A.

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); 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); BM: brain metastasis; SRCC: Spearman’s rank correlation coefficient.