Table 5 DVH parameters comparison of conventional plans and ED plans for key OARs (Mean ± SD)

Head&Neck

Spinal cord

\({\text{D}}_{{\text{0.1}\text{cm}}^{\text{3}}}\) (Gy)

31.53 ± 1.06

31.49 ± 1.41

0.403

Parotids

D_mean (Gy)

21.15 ± 5.42

20.09 ± 5.40

0.086

D_50% (Gy)

15.45 ± 5.80

15.25 ± 5.75

0.002

Brain stem

\({\text{D}}_{{\text{0.1}\text{cm}}^{\text{3}}}\)(Gy)

35.64 ± 13.60

35.77 ± 13.64

0.008

Chest

Double Lung

V_20Gy (%)

7.52 ± 1.90

7.53 ± 1.94

0.818

D_mean (Gy)

3.73 ± 0.72

3.76 ± 0.73

0.114

Lateral lung

D_mean (Gy)

6.63 ± 2.68

6.67 ± 2.70

0.205

Contralateral lung

D_mean (Gy)

0.04 ± 0.03

0.04 ± 0.03

0.089

Heart

V_5Gy (%)

2.93 ± 5.23

2.97 ± 5.27

0.199

D_mean (Gy)

1.17 ± 1.41

1.18 ± 1.42

0.229

Spinal cord

\({\text{D}}_{{\text{0.1}\text{cm}}^{\text{3}}}\) (Gy)

0.32 ± 0.08

0.33 ± 0.08

0.000

Pelvis

Small intestine

\({\text{D}}_{{\text{2}\text{cm}}^{\text{3}}}\) (Gy)

46.50 ± 0.38

46.47 ± 0.41

0.222

D_50% (Gy)

20.07 ± 6.20

20.03 ± 6.17

0.106

Rectum

D_mean (Gy)

35.95 ± 2.56

36.00 ± 2.59

0.085

D_50% (Gy)

40.45 ± 3.65

40.55 ± 3.72

0.014

Bladder

D_mean (Gy)

35.81 ± 3.10

35.75 ± 3.11

0.607

D_50% (Gy)

36.73 ± 4.15

36.75 ± 4.20

0.306

Spinal cord

\({\text{D}}_{{\text{0.1}\text{cm}}^{\text{3}}}\) (Gy)

20.48 ± 3.18

20.48 ± 3.25

0.989