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Table 2 Dosimetric indices of normal structures and PTV50 for 4D dose distributions calculated using the t4Dplan method and the ITV method for the three patients.

From: A 4D IMRT planning method using deformable image registration to improve normal tissue sparing with contemporary delivery techniques

 

Parameters

Patient 1

Patient 2

Patient 3

  

t4DPlan

ITV

t4DPlan

ITV

t4Dplan

ITV

Total lung

V5 (%)

55.4

63.9

32.2

32.7

41.0

42.5

 

V10 (%)

30.2

35.7

24.2

25.4

25.0

26.2

 

V20 (%)

19.1

24.3

20.7

21.7

17.3

18.2

 

V30 (%)

14.8

19.8

18.3

17.6

13.0

13.4

 

Mean (Gy)

13.2

16.3

12.8

12.9

11.3

11.8

Spinal cord

Max (Gy)

30.1

26.3

31.6

32.3

34.0

38.0

Heart

Mean (Gy)

10.8

13.4

23.8

24.2

18.8

19.0

Stomach

V40 (%)

  

8.2

21.4

  
 

V50 (%)

  

2.6

10.6

  
 

Max (Gy)

  

54.1

62.3

  
 

Mean(Gy)

  

19.3

27.3

  

Liver

V30(%)

    

28.3

42.1

 

Mean (Gy)

    

22.8

31.3

PTV50

V63 (%)

98

99.3

96.4

98.0

95.1

97.0

 

CN

0.74

0.57

0.91

0.78

0.81

0.67

 

R63

0.94

0.99

0.94

0.97

0.91

0.94

  1. Abbreviations: R63 = ratio of volume greater than or equal to 63 Gy of 4D dose distribution to AppD; CN = conformity number; Vx = the volume of structures received dose >x Gy; Max = Maximum.