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Table 1 Analysis of the CTVs volume contouring pre and post the introduction of guidelines

From: Dosimetric impact of inter-observer variability for 3D conformal radiotherapy and volumetric modulated arc therapy: the rectal tumor target definition case

PRE-Guidelines

Patient

Mean Volume(cm3)

Vmax-Vmin(cm3)

Range[ min; max] (cm3)

Δ (%)

Vmax/Vmin

1

745

336

[656; 992]

45

1.51

2

772

682

[528; 1210]

81

2.08

3

545

494

[380; 874]

91

2.30

4

499

467

[366; 833]

94

2.28

5

540

302

[415; 716]

56

1.73

6

463

248

[330; 578]

54

1.75

7

559

117

[494; 611]

21

1.24

8

722

307

[618; 925]

43

1.50

9

648

480

[486; 966]

74

1.99

10

994

423

[790; 1213]

43

1.54

     Mean

649

380

-

60

1.79

      St Dev

162

147

-

24

0.36

      Median

603

380

-

55

1.74

POST - Guidelines

Patient

Mean Volume ( cm 3 )

Vmax - Vmin ( cm 3 )

Range [ min ; max ] ( cm )

Δ(%)

Vmax / Vmin

1

797

98

[848; 750]

12

1.13

2

666

254

[771; 518]

38

1.49

3

496

136

[565; 429]

27

1.32

4

400

31

[417; 386]

8

1.08

5

483

40

[504; 465]

8

1.09

6

406

153

[483; 331]

38

1.46

7

502

168

[574; 406]

33

1.41

8

608

79

[642; 564]

13

1.14

9

574

132

[635; 503]

23

1.26

10

1019

283

[1174; 891]

28

1.32

      Mean

595

137

-

23

1.27

      St Dev

192

83

-

12

0.15

      Median

538

134

-

25

1.29