Skip to main content

Table 2 Results of dosimetric comparisons for OARs from DVH (\( \overline{x}\pm S \))

From: Dosimetric comparison of helical tomotherapy, VMAT, fixed-field IMRT and 3D-conformal radiotherapy for stage I-II nasal natural killer T-cell lymphoma

Parameters

HT

VMAT

IMRT

3D-CRT

p-Value

HT VS. VMAT

HT VS. IMRT

HT VS. 3D-CRT

VMAT VS. IMRT

VMAT VS. 3D-CRT

IMRT VS. 3D-CRT

Optic chiasm

Dmax (Gy)

48.48 ± 1.52

47.13 ± 1.33

46.50 ± 1.17

48.13 ± 0.94

0.016

0.020

0.761

0.174

0.340

0.162

Dmean (Gy)

38.01 ± 2.95

37.75 ± 2.44

37.77 ± 1.57

40.75 ± 1.60

0.880

0.908

0.210

0.984

0.108

0.046

Left optic nerve

Dmax (Gy)

49.43 ± 2.42

46.62 ± 3.12

47.01 ± 3.31

46.87 ± 3.37

0.007

0.033

0.053

0.264

0.724

0.834

Dmean (Gy)

45.56 ± 2.86

41.81 ± 3.59

38.01 ± 3.66

36.92 ± 4.98

0.002

0.000

0.012

0.007

0.049

0.609

Right optic nerve

Dmax (Gy)

50.32 ± 0.75

48.02 ± 1.02

48.23 ± 1.09

49.08 ± 1.22

0.002

0.018

0.281

0.774

0.300

0.272

Dmean (Gy)

45.95 ± 1.83

42.02 ± 2.23

37.85 ± 2.73

36.70 ± 4.39

0.001

0.002

0.024

0.058

0.152

0.570

Left eye

Dmax (Gy)

45.74 ± 2.81

45.39 ± 4.24

44.15 ± 3.79

51.35 ± 3.12

0.859

0.329

0.003

0.264

0.005

0.000

Dmean (Gy)

21.36 ± 2.23

22.43 ± 2.64

15.15 ± 2.17

22.01 ± 5.09

0.550

0.008

0.881

0.001

0.914

0.072

Right eye

Dmax (Gy)

44.90 ± 2.17

43.56 ± 2.31

39.78 ± 4.19

49.71 ± 3.45

0.213

0.090

0.084

0.116

0.007

0.000

Dmean (Gy)

20.49 ± 2.12

19.94 ± 2.37

13.34 ± 2.34

19.45 ± 5.10

0.745

0.005

0.805

0.000

0.881

0.070

Left lens

Dmax (Gy)

8.00 ± 1.09

10.90 ± 1.15

7.75 ± 0.70

15.27 ± 6.30

0.043

0.815

0.303

0.001

0.511

0.254

Dmean (Gy)

5.41 ± 0.67

8.93 ± 0.72

6.39 ± 0.52

11.40 ± 6.65

0.002

0.228

0.404

0.000

0.719

0.460

Right lens

Dmax (Gy)

7.43 ± 0.89

9.33 ± 0.44

7.00 ± 0.49

13.92 ± 6.53

0.118

0.693

0.373

0.000

0.488

0.301

Dmean (Gy)

4.83 ± 0.41

8.05 ± 0.46

5.92 ± 0.46

10.98 ± 6.54

0.000

0.083

0.382

0.000

0.662

0.450

Spinal cord

Dmax (Gy)

18.94 ± 4.76

21.67 ± 5.46

19.02 ± 4.30

19.65 ± 5.36

0.236

0.968

0.806

0.086

0.615

0.852

Dmean (Gy)

2.70 ± 0.76

2.43 ± 0.67

2.20 ± 0.63

2.23 ± 0.51

0.363

0.060

0.191

0.024

0.438

0.895

Brainstem

Dmax (Gy)

30.60 ± 4.41

38.46 ± 1.70

35.56 ± 1.73

33.74 ± 4.21

0.044

0.168

0.090

0.000

0.189

0.601

Dmean (Gy)

19.15 ± 3.27

25.98 ± 1.48

25.24 ± 1.62

20.72 ± 3.05

0.097

0.081

0.652

0.471

0.191

0.181

Left parotid

Dmax (Gy)

29.48 ± 4.46

26.34 ± 5.31

25.78 ± 4.60

34.16 ± 6.78

0.031

0.010

0.212

0.622

0.015

0.039

Dmean (Gy)

14.51 ± 3.02

11.51 ± 2.97

10.87 ± 2.72

13.66 ± 4.05

0.007

0.000

0.577

0.230

0.256

0.133

Right parotid

Dmax (Gy)

25.27 ± 4.77

22.38 ± 5.59

23.68 ± 5.51

28.48 ± 7.38

0.031

0.232

0.454

0.095

0.110

0.156

Dmean (Gy)

12.20 ± 4.06

11.08 ± 3.53

10.31 ± 3.14

13.14 ± 4.63

0.372

0.280

0.578

0.243

0.220

0.144