Dose errors

MLC errors (mm)

Gantry Angle errors (˚)

Col Angle errors (˚)

−1%

−3%

−5%

1%

3%

5%

−0.25

−0.5

0.25

0.5

1.5

2.5

1

2

3

1

4

3D Gamma index

100

97.4

93.4

100

98.4

94.3

100

97.4

100

98.0

78.2

66.8

99.9

98.6

95.5

100

100

Average 3D

gamma

PTV

0.45

1.3

1.58

0.44

1.15

1.53

0.52

1

0.49

0.93

1.59

1.60

0.14

0.23

0.31

0.03

0.05

Rt Parotid

0.14

0.32

0.42

0.14

0.28

0.4

0.29

0.43

0.29

0.42

1

1.34

0.22

0.32

0.43

0.02

0.03

Lt Parotid

0.19

0.35

0.45

0.18

0.32

0.41

0.33

044

0.33

0.47

1.09

1.37

0.29

0.41

0.55

0.03

0.04

Cord

0.15

0.42

0.61

0.16

0.38

0.61

0.33

0.57

0.33

0.58

1.28

1.43

0.15

0.24

0.33

0.03

−0.15

%

difference

PTV

D95

−1.06

−3.24

−4.92

0.98

2.96

5.11

−1.36

−2.74

1.23

2.56

7.06

11.33

−0.21

−0.57

−0.93

−0.07

−0.15

Cord

Dmax

−1.4

−3.09

−5.06

1.15

2.71

4.85

−2.15

−4.42

2.18

4.61

14.16

24.94

0.4

0.98

2.14

0.09

0.03

Rt Parotid

D50

−1.03

−3.4

−5.37

1.06

2.75

4.93

−4.7

−9.59

4.54

9.59

31.11

54.5

2.62

6.82

10.68

0.1

−0.15

Lt Parotid

D50

−1.21

−2.72

−4.74

1.08

2.99

4.6

−4.14

−7.81

4.76

9.47

31.4

54

−2.28

−2.7

−3.64

0.42

−0.1