Table 4 The mechanism of T operator guiding radiotherapy plan optimization.

From: Application research on reducing radiation-induced lung injury with a trigger operator based on overlap volume histogram (OVH) in breast cancer postoperative radiotherapy

CG

Patient NO

1

2

3

4

6

7

8

12

13

14

 

V(d = 3.3 cm)

37

40.62

31.81

34.85

35.49

37.59

32.6

36.95

38.4

33.46

V20

15.6

14.5

13.4

11.6

17.2

16

17.3

18.4

11.4

11.9

TR

0.42

0.37

0.42

0.33

0.48

0.43

0.53

0.5

0.3

0.36

V20(R1)

14

12.4

9

/

12.9

11.4

11.7

12.2

—

10.4

TR1

0.38

0.31

0.28

0.35

0.36

0.3

0.36

0.33

0.3

0.31

V20(R2)

12.4

11.1

—

/

12.6

11.4

/

11.4

10.6

9.6

SG

NO

5

9

10

11

15

16

    
 

V(d = 3 cm)

28.42

27.47

27.54

30.53

33

31.45

    

V20

11.9

10.5

11.4

14.8

11.9

11

    

TR

0.42

0.38

0.41

0.48

0.36

0.35

    

V20(R1)

7.4

5.7

6.5

7.6

8.2

—

    

TR1

0.26

0.21

0.24

0.25

0.25

0.24

    

V20(R2)

7.3

—

6.3

/

/

7.6

    
  1. *R1: first round, R2: second round, —: indicates that the T-value is used as a trigger operator, and the plan was not re-optimized in this round; /: indicates that the V20 value increases after re-optimization and is not included in the statistics.
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