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Table 2 Dosimetric data for neurological organs at risk

From: Effects of dosimetric inadequacy on local control and toxicities in the patients with T4 nasopharyngeal carcinoma extending into the intracranial space and treated with intensity-modulated radiotherapy plus chemotherapy

Organ at risk Dmax (Gy) D1 (Gy) V45 Gy (%) V54 Gy (%) V57 Gy (%) V60 Gy (%) V65Gy (%)
Brainstem 55.9 (53.3–58.2) 53.3 (50.8–56.2) / 1.1 (0–10.9) 0 0 0
Spinal cord 43.9 (41.0–45.7) 41.1 (36.9–44.0) 0 0 0 0 0
Optic chiasm 56.4 (43.1–59.6) 56.0 (41.9–59.5) / 43.1 (0–98.8) 2.3 (0–47.8) 0 0
Optic nerve
 (A) 54.6 (42.4–60.1) 54.1 (41.9–59.5) / 14.1 (0–51.9) 1.2 (0–17.3) 0 0
 (N) 54.5 (42.4–58.9) 53.9 (42.0–58.3) / 9.9 (0–44.3) 0.1 (0–3.0) 0 0
Temporal lobe
 (A) 65.1 (60.4–68.4) 63.0 (58.3–65.8) / / / 7.9 (0.1–49.9) 0.2 (0–1.9)
 (N) 64.7 (58.8–67.6) 61.9 (53.4–64.5) / / / 4.2 (0–13.2) 0
  1. All values are presented as mean followed by range in parentheses
  2. D max maximum point dose, D 1 maximum dose to 1% of the volume, V x Gy percentage volume receiving a dose of x Gy or more, (x = 45, 54, 57, 60, and 65), / not applicable, A affected side, N unaffected side