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Table 3 Dosimetric comparison of organs at risk dose-volume metrics (n = 16) (Avg ± STD and p values)

From: Dosimetric evaluation of VMAT and helical tomotherapy techniques comparing conventional volumes with clinical target volumes based on new ESTRO ACROP post-mastectomy with immediate implant reconstruction contouring guidelines

Metric

HT

HTp

VMATp

χ2

p value

Diff.**

Mean (SD)

Mean (SD)

Mean (SD)

Heart Dmax (Gy)

30.95 (10.37)

28.32 (7.36)

26.76 (8.73)

5.375

0.068

Heart Dmean (Gy)

4.10 (0.86)

4.57 (1.62)

5.65 (1.86)

5.375

0.068

Heart V5

21.2 (9.8)

30 (20.4)

42.7 (24.8)

9.125

0.010*

c > a

LAD Dmax (Gy)

24.92 (14.59)

9.15 (4.13)

19.49 (5.58)

12.250

0.002*

b < a,c

LAD Dmean (Gy)

8.94 (7.85)

4.25 (1.19)

8.33 (1.27)

13.000

0.002*

b < a,c

Ipsilat Lung V5 (%)

39.2 (4.4)

44.8 (9.4)

91.7 (7.3)

24.500

< 0.001*

c > a,b

Ipsilat Lung V20 (%)

14.3 (1.8)

10.8 (3.1)

18.6 (6.3)

21.500

< 0.001*

b < a,c&a < c

Contralat Lung Dmax (Gy)

26.33 (5.36)

23.77 (7.16)

21.56 (5.96)

10.500

0.005*

a > c

Contralat Lung Dmean (Gy)

4.75 (1.36)

5.233 (1.56)

5.485 (1.26)

10.500

0.005*

a < c

Contralat Lung V5 (%)

32.4 (12.2)

35.8 (14.9)

50.1 (18.5)

10.500

0.005*

c > a,b

Contralat breast Dmax (Gy)

22.02 (5.13)

24.28 (3.46)

21.07 (5.19)

2.625

0.269

Contralat breast Dmean (Gy)

5.09 (1.33)

6.17 (1.52)

3.36 (1.46)

21.125

< 0.001*

c < a,b

Implant Dmax (Gy)

53.48 (1.63)

53.79 (1.55)

53.68 (1.01)

0.875

0.646

Implant Dmean (Gy)

50.24 (0.40)

40.88 (2.71)

37.48 (3.33)

27.125

< 0.001*

a > b > c

Liver V20 (cc)

0.2 (0.1)

0.8 (0.4)

0.9 (0.5)

3.714

0.156

Normal tissue V5 (cc)

6817.7 (3285.7)

7125.2 (3364.9)

7794.8 (3813.2)

10.145

0.006*

c > a

  1. Results with statistical significance are shown in bolditalics
  2. Italics is used for general statistical results
  3. χ2, Friedman test; Dmax, max dose; Dmean, mean dose; Vx,volume (%) receiving x dose (Gy) or higher; SD,Standard deviation; Diff, difference
  4. *p < 0.05; **p < 0.02 (0.05/3) Wilcoxon signed-rank test