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Table 4 The dose of radiation brain stem injury in 8 patient

From: A retrospective dosimetry study of intensity-modulated radiotherapy for nasopharyngeal carcinoma: radiation-induced brainstem injury and dose-volume analysis

patient

GTVnx

D1%

Dmean

Dmax

D0.1cc

D1cc

Di

D2%

BEDD2%

D98%

BEDD98%

1

77.69

94.16

72.10

87.39

64.35

49.64

68.47

65.60

62.11

61.30

2

78.60

95.26

75.01

90.91

65.20

38.04

71.59

66.96

61.46

68.60

3

82.32

99.77

73.52

89.11

65.10

44.99

69.72

65.93

59.03

64.30

4

80.66

97.76

71.23

86.33

66.44

31.75

74.07

68.64

59.25

68.20

5

73.49

89.07

68.90

83.51

60.15

36.43

63.38

60.89

56.57

58.10

6

81.79

99.13

72.70

88.11

63.73

32.40

69.41

65.79

60.00

61.73

7

78.80

95.51

72.06

87.34

61.80

36.66

67.87

63.60

54.60

60.00

8

77.32

93.71

75.25

91.20

50.94

24.85

55.30

52.47

47.77

51.71

  1. D2% near the maximum absorbed dose of GTVnx, D98% near the minimum absorbed dose of GTVnx, D1% the dose of 1% brainstem volume, Dmean the mean dose of brainstem, Dmax the maximum point dose of brainstem, D0.1cc the maximum dose of brainstem delivered to a volume of 0.1 ml, D1cc the maximum dose of brainstem delivered to a volume of 1.0 ml, Di injury lesion dose of brainstem, GTVnx Gross tumor volume of nasopharyngeal primary lesions and their direct extensions
  2. Abbreviation: GTV Gross tumor volume, BED Biological effective dose