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Table 1 The mean dose (D mean ) and the maximum dose (D max ) to each of the swallowing structures and the partial volumes of each of these structures receiving a specified dose (V D S) as calculated from the dose-volume histograms (DVH) for the entire group of patients

From: Assessment of early and late dysphagia using videofluoroscopy and quality of life questionnaires in patients with head and neck cancer treated with radiation therapy

 

Dose-volume data

Swallowing structure

Dmean (Gy) Mean ± SD (range)

Dmax (Gy) Mean ± SD (range)

V60 (%) Mean ± SD (range)

V65 (%) Mean ± SD (range)

V70 (%) Mean ± SD (range)

PCM

61.96 ± 7.90 (33.26 - 69.96)

72.61 ± 2.55 (64.88 - 76.79)

74.57 ± 19.83 (31.00 - 99.92)

51.31 ± 24.47 (0.00 - 90.38)

22.24 ± 19.50 (0.00 - 65.33)

SPCM

60.66 ± 11.85 (22.94 - 71.65)

70.55 ± 4.56 (58.34 - 76.79)

70.83 ± 34.87 (0.00 - 100.00)

49.13 ± 41.45 (0.00 - 100.00)

22.23 ± 28.19 (0.00 - 83.03)

MPCM

66.65 ± 3.51 (61.28 - 74.03)

69.63 ± 3.72 (63.47 - 76.79)

98.23 ± 4.79 (79.56 - 100.00)

61.56 ± 42.23 (0.00 - 100.00)

22.97 ± 37.04 (0.00 - 100.00)

IPCM

63.58 ± 6.06 (50.39 - 71.55)

68.61 ± 4.30 (61.27 - 75.99)

75.83 ± 31.97 (2.35 - 100.00)

46.90 ± 45.55 (0.00 - 100.00)

16.51 ± 29.57 (0.00 - 88.40)

BOT

50.75 ± 12.52 (23.71 - 71.49)

69.39 ± 4.90 (53.82 - 74.83)

49.38 ± 31.76 (0.00 - 99.99)

27.05 ± 30.75 (0.00 - 99.97)

8.38 ± 18.41 (0.00 - 77.40)

Larynx

66.84 ± 6.37 (50.56 - 74.89)

72.64 ± 4.00 (64.45 - 79.30)

87.11 ± 23.21 (29.27 - 100.00)

69.66 ± 33.84 (0.00 - 100.00)

39.25 ± 40.02 (0.00 - 100.00)

PES

50.48 ± 9.83 (25.41 - 66.83)

59.63 ± 7.65 (47.11 - 69.85)

17.45 ± 27.58 (0.00 - 100.00)

10.43 ± 23.51 (0.00 - 99.32)

0.00

  1. The pharyngeal constrictor muscle: PCM, the superior pharyngeal constrictor muscle: SPCM, the middle pharyngeal constrictor muscle: MPCM, the inferior pharyngeal constrictor muscle: IPCM, the base of tongue: BOT and the proximal esophageal sphincter: PES.