Table 3 Comparison of OARs’ doses calculated from PVP, HAP and non-enhanced CTs

3D-CRT

Liver V21 (%)

12.77 ± 11.45

12.87 ± 11.53

12.94 ± 11.55

0.000

1.70 ± 1.50

0.000

0.90 ± 1.20

0.000

0.80 ± 0.85

0.000

Liver Dmean (Gy)

8.52 ± 5.00

8.57 ± 5.03

8.61 ± 5.04

0.000

1.02 ± 0.73

0.000

0.51 ± 0.64

0.000

0.52 ± 0.47

0.000

Right kidney D2%(Gy)

13.59 ± 14.36

13.60 ± 14.35

13.69 ± 14.48

0.000

0.56 ± 1.29

0.000

0.33 ± 1.10

0.001

0.23 ± 0.58

0.140

Right kidney Dmean (Gy)

2.87 ± 3.47

2.87 ± 3.47

2.89 ± 3.50

0.201

-0.09 ± 1.01

-

0.18 ± 0.81

-

-0.27 ± 0.53

-

Bowl D2% (Gy)

12.83 ± 8.63

12.84 ± 8.65

12.86 ± 8.72

0.040

-0.31 ± 2.50

0.254

-0.13 ± 2.27

0.074

-0.18 ± 1.13

0.268

Stomach D2% (Gy)

16.42 ± 7.62

16.54 ± 7.66

16.65 ± 7.69

0.000

1.45 ± 2.33

0.003

0.71 ± 1.40

0.004

0.74 ± 1.31

0.001

Spinal cord D2% (Gy)

11.28 ± 6.79

11.31 ± 6.79

11.36 ± 6.81

0.006

0.73 ± 1.38

0.000

0.46 ± 0.88

0.004

0.27 ± 1.06

0.234

IMRT

Liver V21 (%)

25.31 ± 6.90

25.35 ± 6.89

25.39 ± 6.87

0.040

0.38 ± 0.87

0.046

0.19 ± 0.68

0.338

0.19 ± 0.43

0.026

Liver Dmean (Gy)

10.00 ± 4.95

10.05 ± 4.99

10.09 ± 4.99

0.000

0.97 ± 0.77

0.000

0.49 ± 0.74

0.000

0.48 ± 0.46

0.000

Right kidney D2% (Gy)

14.71 ± 14.88

14.71 ± 14.89

14.82 ± 15.02

0.003

0.32 ± 1.22

0.002

0.30 ± 1.21

0.006

0.01 ± 0.50

0.050

Right kidney Dmean (Gy)

3.04 ± 3.12

3.03 ± 3.12

3.06 ± 3.15

0.090

0.02 ± 1.00

-

0.29 ± 0.84

-

-0.27 ± 0.54

-

Bowl D2% (Gy)

10.99 ± 6.88

11.02 ± 6.90

11.09 ± 6.93

0.000

0.90 ± 0.86

0.000

0.65 ± 0.88

0.002

0.26 ± 0.69

0.178

Stomach D2% (Gy)

11.73 ± 6.99

11.80 ± 7.03

11.85 ± 7.07

0.000

0.89 ± 1.90

0.012

0.39 ± 1.23

0.008

0.50 ± 1.28

0.002

Spinal cord D2% (Gy)

9.09 ± 4.50

9.12 ± 4.49

9.17 ± 4.50

0.003

0.99 ± 1.64

0.003

0.57 ± 1.13

0.001

0.42 ± 0.95

0.195

VMAT

Liver V21 (%)

20.71 ± 7.27

20.75 ± 7.27

20.77 ± 7.26

0.017

0.35 ± 0.71

0.018

0.14 ± 0.47

0.355

0.21 ± 0.34

0.005

Liver Dmean (Gy)

10.10 ± 5.24

10.16 ± 5.28

10.20 ± 5.29

0.000

0.97 ± 0.67

0.000

0.45 ± 0.59

0.000

0.52 ± 0.43

0.000

Right kidney D2% (Gy)

14.30 ± 14.80

14.33 ± 14.83

14.41 ± 14.87

0.000

0.68 ± 1.08

0.000

0.38 ± 0.89

0.000

0.31 ± 0.48

0.000

Right kidney Dmean (Gy)

3.34 ± 3.55

3.34 ± 3.55

3.36 ± 3.56

0.187

-0.03 ± 1.03

-

0.14 ± 0.76

-

-0.17 ± 0.41

-

Bowl D2% (Gy)

11.87 ± 7.28

11.90 ± 7.32

11.98 ± 7.35

0.000

0.95 ± 0.87

0.000

0.81 ± 1.02

0.001

0.14 ± 0.94

0.206

Stomach D2% (Gy)

11.53 ± 8.30

11.65 ± 8.47

11.65 ± 8.40

0.000

0.78 ± 1.60

0.001

0.08 ± 1.95

0.031

0.70 ± 1.12

0.000

Spinal cord D2% (Gy)

9.92 ± 3.79

9.93 ± 3.79

9.95 ± 3.80

0.013

0.24 ± 1.18

0.010

0.21 ± 0.56

0.031

0.04 ± 0.77

0.081