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Table 4 Example of the global calculation results of the gamma evaluation and the index system for one of the head and neck cases applied spatial displacement along lateral direction

From: To propose adding index of achievement (IOA) to IMRT QA process

 

Intentional Dose Error

−3%

−2%

−1%

0

+ 1%

+ 2%

+ 3%

Intentional Spatial Error

-3 mm

Gamma pass rate (%)

4%/4 mm

92.7

100.0

100.0

100.0

100.0

100.0

92.6

3%/3 mm

69.9

81.5

88.6

100.0

89.2

82.6

69.5

2%/2 mm

45.7

55.4

63.5

66.1

62.7

53.0

43.5

1%/1 mm

13.3

17.4

22.2

23.3

20.2

15.9

12.1

IOA

1.060

1.056

1.052

1.051

1.052

1.055

1.059

IOH

1.022

1.025

1.029

1.034

1.039

1.045

1.052

IOC

0.936

0.942

0.948

0.953

0.958

0.962

0.966

-2 mm

Gamma pass rate (%)

4%/4 mm

100.0

100.0

100.0

100.0

100.0

100.0

100.0

3%/3 mm

79.4

100.0

100.0

100.0

100.0

100.0

76.9

2%/2 mm

47.6

65.4

79.4

100.0

78.8

62.6

46.9

1%/1 mm

11.8

17.5

29.0

35.1

27.1

17.0

11.4

IOA

1.049

1.043

1.039

1.038

1.039

1.042

1.048

IOH

1.014

1.017

1.020

1.024

1.030

1.036

1.044

IOC

0.948

0.955

0.961

0.966

0.971

0.975

0.978

-1 mm

Gamma pass rate (%)

4%/4 mm

100.0

100.0

100.0

100.0

100.0

100.0

100.0

3%/3 mm

94.6

100.0

100.0

100.0

100.0

100.0

92.9

2%/2 mm

47.6

81.4

100.0

100.0

100.0

79.1

47.0

1%/1 mm

8.2

16.1

40.7

100.0

37.2

16.0

7.4

IOA

1.036

1.029

1.023

1.020

1.022

1.028

1.036

IOH

1.005

1.007

1.009

1.013

1.019

1.026

1.035

IOC

0.962

0.970

0.976

0.982

0.986

0.989

0.992

0

Gamma pass rate (%)

4%/4 mm

100.0

100.0

100.0

100.0

100.0

100.0

100.0

3%/3 mm

100.0

100.0

100.0

100.0

100.0

100.0

100.0

2%/2 mm

55.3

100.0

100.0

100.0

100.0

100.0

55.8

1%/1 mm

0

0.1

100.0

100.0

100.0

0.1

0

IOA

1.030

1.020

1.010

1.000

1.010

1.020

1.030

IOH

1.000

1.000

1.000

1.000

1.010

1.020

1.030

IOC

0.970

0.980

0.990

1.000

1.000

1.000

1.000

+ 1 mm

Gamma pass rate (%)

4%/4 mm

100.0

100.0

100.0

100.0

100.0

100.0

100.0

3%/3 mm

92.8

100.0

100.0

100.0

100.0

100.0

95.0

2%/2 mm

45.7

78.4

100.0

100.0

100.0

82.2

48.5

1%/1 mm

7.1

15.4

36.5

100.0

41.3

16.6

8.4

IOA

1.036

1.029

1.023

1.020

1.023

1.028

1.036

IOH

1.005

1.007

1.010

1.014

1.019

1.027

1.035

IOC

0.962

0.971

0.978

0.984

0.989

0.992

0.995

+ 2 mm

Gamma pass rate (%)

4%/4 mm

100.0

100.0

100.0

100.0

100.0

100.0

100.0

3%/3 mm

75.6

100.0

100.0

100.0

100.0

100.0

81.6

2%/2 mm

44.3

60.7

78.5

100.0

79.9

67.0

49.9

1%/1 mm

10.6

16.3

26.3

35.1

29.8

18.2

12.5

IOA

1.049

1.043

1.039

1.038

1.039

1.042

1.048

IOH

1.015

1.018

1.022

1.026

1.031

1.037

1.045

IOC

0.950

0.958

0.964

0.970

0.976

0.980

0.984

+ 3 mm

Gamma pass rate (%)

4%/4 mm

91.5

100.0

100.0

100.0

100.0

100.0

94.3

3%/3 mm

66.4

80.1

88.1

100.0

89.9

84.4

74.1

2%/2 mm

41.4

51.1

61.7

66.0

64.6

57.6

47.9

1%/1 mm

11.1

14.9

19.5

23.3

23.0

18.2

14.1

IOA

1.060

1.056

1.053

1.051

1.052

1.055

1.059

IOH

1.024

1.028

1.032

1.036

1.041

1.047

1.054

IOC

0.940

0.947

0.954

0.960

0.966

0.970

0.975