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Table 2 Dose–volume histograms (DVHs) statistics for patients of local-regional recurrence

From: Patterns of local-regional failure after primary intensity modulated radiotherapy for nasopharyngeal carcinoma

  GTV_P GTV_N CTV1 CTV2
Average (range) Average (range) Average (range) Average (range)
Volume (cc) 88.5 (35–140.3) 85 (34.2–167) 298.6 (117.8–530.8) 124 (27.1–228.1)
Dmax (Gy) 75.5 (71.7–77.6) 73.2 (71.2–75.3) 75.2 (70.4–77.6) 61.7 (58.9–63.9)
Dmean (Gy) 71.5 (68–72.9) 68.7 (68–69.9) 65.9 (62.1–69.2) 56.7 (55.5–57.5)
Dmin (Gy) 59.9 (52.7–65.4) 58.8 (48.4–64.2) 43.4 (17.5–54.5) 43.3 (7-51)
V95% 1.7 (0–6.3) 0.3 (0–1.5) 0.7 (0.2–2.1) 0.4 (0–1.4)
V100% 91.3 (77.3–98.9) 95.6 (90.9–98.9) 96.5(92.1–99.1) 96.6 (93.9–99.5)
V110% 0.06 (0–1.1) 0.7 (0–3.8) 44 (2.1–76) 5.7 (0–14.5)
  1. GTV_P gross tumor volume of primary tumor, GTV_N gross tumor volume of involved lymph nodes, CTV1 clinical tumor volume of the high-risk region, CTV2 clinical tumor volume of lymph nodal regions at low risk. Dmax = Maximum dose, Dmean = Mean dose, Dmin = Minimum dose. V95% =%volume receiving < 95% of the prescribed dose, V100% =% volume receiving >100% of the prescribed dose, V110% =% volume receiving >110% of the prescribed dose.