Table 2 Two-group analysis in terms of planning target volume (PTV) size. For each group, CI and V12Gy were compared between circular collimator arc (CCA) and dynamic conformal arc (DCA) treatment planning

PTV (cm³)

Sample size (%)

CI comparison

CCA

DCA

CCA

DCA

Minimum

1.26

1.17

1.17

1.15

Maximum

2.42

1.56

1.81

1.45

Mean

1.49

1.34

1.43

1.26

Standard deviation

0.22

0.09

0.14

0.07

p-value

V12Gy (cm³) comparison

CCA

DCA

CCA

DCA

Minimum

0.31

0.32

1.21

1.36

Maximum

1.45

1.34

3.42

3.44

Mean

0.82

0.87

1.93

2.01

Standard deviation

0.28

0.27

0.60

0.54

p-value