Table 3 Comparison of absolute and relative transit doses measured with EPID and the lung region of an anthropomorphic phantom

Field 1

−1.1

83.3

−1.4

84.9

0.1

87.0

−1.4

86.6

Field 2

−0.8

85.7

2.2

90.3

3.9

87.2

−0.6

86.7

Field 3

−4.0

89.5

−1.4

87.9

0.5

88.8

1.1

88.9

Field 4

0.6

82.2

−0.7

82.4

−1.2

87.3

−5.1

92.2

Field 5

−1.3

83.6

1.0

94.4

−3.3

91.2

3.5

93.8

Field 6

−2.2

79.3

0.2

81.8

0.8

80.4

1.7

87.8

Mean

−1.5

83.9

0.0

86.9

0.1

87.0

−0.1

89.3

SD

1.5

3..4

1.4

4.9

2.4

3.6

3.0

3.0