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Table 4 Mean dose of organs at risk

From: Propensity score matching analysis of a phase II study on simultaneous modulated accelerated radiation therapy using helical tomotherapy for nasopharyngeal carcinomas

  Mean value (Range) (Gy) P*
P67.5 P70
pGTVnx Dmean 70.2 (69.2-72.6) 72.3 (70.4-75.6) 0.000
pGTVnd Dmean 70.2 (69.3-72.7) 72.3 (70.1-75.6) 0.000
PTV1 Dmean 64.9 (63.1-67.3) 64.7 (62.1-70.5) 0.34
PTV2 Dmean 56.7 (55.7-59.8) 57.6 (55.0-61.7) 0.000
Brainstem Dmax 51.2 (35.9-69.1) 54.7 (41.6–71.9) 0.000
Spinal cord Dmax 40.6 (35.2-51.1) 41.7 (33.8–48.7) 0.007
Optic nerve Dmax    
 Left 29.2 (3.9–70.4) 39.3 (9.7–72.2) 0.000
 Right 28.5 (4.6–70.8) 39.5 (9.2–72.4) 0.000
Eyeball Dmax    
 Left 19.4 (4.0–38.9) 31.1 (10.0–62.3) 0.000
 Right 19.1 (5.3–38.8) 30.9 (11.2–57.7) 0.000
Lens Dmax    
 Left 3.2 (2.1–5.3) 4.2 (2.2–8.1) 0.000
 Right 3.3 (2.2–8.3) 4.2 (2.2–8.3) 0.000
TMJ Dmean    
 Left 33.5 (22.6–55.1) 39.2 (22.9–58.5) 0.000
 Right 33.2 (22.5–64.7) 38.3 (21.1–50.9) 0.001
Internal ear Dmean    
 Left 45.4 (27.4–67.1) 44.2 (34.4–58.0) 0.357
 Right 44.8 (26.3–61.7) 45.2 (36.1–59.0) 0.786
Parotid gland Dmean    
 Left 30.9 (25.2–39.9) 31.6 (23.8–55.1) 0.194
 Right 30.9 (22.9–65.2) 31.3 (22.1–39.7) 0.492
Oral cavity Dmean 34.2 (26.6-42.0) 39.6 (20.4–50.2) 0.000
L-E-T Dmean 32.7 (24.2-38.8) 39.3 (19.1–49.6) 0.000
  1. Abbreviation: Dmean mean dose, Dmax maximum dose, TMJ Temporomandibular joint, L-E-T Larynx-esophagus-trachea
  2. *P-values were calculated using the T test