Table 2 Dosimetric indices and their improvement ratios according to the MLC leaf width (2.5 mm vs. 5 mm) and intensity-modulated techniques (IMRT vs. VMAT)

Overall

TVC

91.83 ± 11.56

88.10 ± 15.23

5.68 ± 10.07

0.003

CI

1.94 ± 0.53

2.06 ± 0.81

−2.42 ± 12.25

0.110

GI

9.99 ± 2.13

10.89 ± 2.81

−6.25 ± 18.84

0.023

IMRT

TVC

88.40 ± 15.62

83.55 ± 20.24

8.38 ± 13.66

0.042

CI

2.03 ± 0.67

2.24 ± 1.06

−4.86 ± 13.00

0.119

GI

9.30 ± 2.06

10.98 ± 3.34

−13.79 ± 7.38

0.003

VMAT

TVC

95.26 ± 3.12

92.65 ± 5.48

2.97 ± 3.10

0.005

CI

1.85 ± 0.34

1.88 ± 0.41

0.02 ± 11.48

0.689

GI

10.68 ± 2.04

10.80 ± 2.30

1.27 ± 23.74

0.871