Skip to main content

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