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Table 2 Dose-volume histogram parameters: comparison of clinical and Auto-Planning plans

From: Evaluation of an automated knowledge based treatment planning system for head and neck

 

Clinical plan

AutoPlanning

t-test

Mean

StDev

Mean

StDev

 

Conformity index (PTV 70 Gy)

0.93

0.08

0.86

0.07

<0.01

Conformity index (PTV 54 Gy)

0.68

0.04

0.64

0.04

<0.01

Homogeneity index (PTV 70 Gy)

1.091

0.017

1.066

0.015

<0.01

Homogeneity index (PTV 60 Gy)

1.103

0.025

1.098

0.028

0.055

Homogeneity index (PTV 54 Gy)

1.106

0.021

1.107

0.018

0.279

Target coverage (PTV70Gy)

94.9

2.7

97.8

1.7

<0.01

Target coverage (PTV60Gy)

94.2

3.1

97.2

2.3

<0.01

Target coverage (PTV54Gy

93.9

3.0

95.2

2.7

<0.01

Myelon maximal dose (Gy)

42.7

3.6

41.1

2.6

<0.01

Mean ipsilat. parotid dose (Gy)

26.8

7.1

24.9

8.8

<0.01

Mean contralat. parotid dose (Gy)

21.4

5.3

19.4

5.9

<0.01

Mean swallowing muscles dose (Gy)

33.5

8.7

30.4

7.7

<0.01

Mean oral mucosa dose (Gy)

29.2

5.2

27.5

6.0

<0.01

Mean mandibular bones dose (Gy)

34.9

4.4

31.6

6.1

<0.01

Mean dorsal neck tissue dose (Gy)

28.2

5.0

24.8

3.7

<0.01

  1. Abbreviations: PTV planning target volume