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Table 3 Dosimetric and anthropometric characteristics* of clinical target volume and rib cage (n = 788)

From: No difference in dose distribution in organs at risk in postmastectomy radiotherapy with or without breast implant reconstruction

 

Chest wall

Chest wall plus lymph nodes

Characteristics

IBR+ n = 59

IBR- n = 162

P-value¶

IBR+ n = 73

IBR- n = 73

P-value¶

CTV

      

  Volume, cm3

629.4 [283.4]

458.4 [273.6]

<0.001

1074.7 [263.0]

787.9 [289.0]

<0.001

  Mean dose, Gy

50.2 [0.9]

50.7 [4.1]

0.31

50.4 [0.6]

50.4 [0.6]

0.97

  V95%, % a

91.2 [5.3]

91.4 [8.4]

0.83

93.7 [3.2]

93.3 [4.4]

0.43

  V95%, cm3b

572.2 [248.9]

417.0 [252.1]

<0.001

1006.7 [251.6]

733.9 [270.0]

<0.001

  V105%, % a

10.8 [8.2]

15.3 [12.1]

0.009

11.8 [6.6]

12.9 [6.1]

0.17

  V105%, cm3b

61.0 [37.9]

65.8 [56.6]

0.55

128.7 [79.6]

104.8 [68.6]

0.007

Rib cage

      

  Transverse diameter, cm

23.5 [1.2]

23.5 [1.5]

0.70

24.2 [1.6]

23.4 [1.5]

<0.001

  Anterioposterior diameter, cm

9.5 [1.5]

10.3 [1.5]

<0.001

9.8 [1.3]

10.3 [1.5]

0.006

  Ipsilateral internal diameter, cm

14.2 [1.3]

15.5 [1.6]

<0.001

14.6 [1.4]

15.3 [1.6]

<0.001

  Chest wall index

2.5 [0.5]

2.3 [0.4]

<0.001

2.5 [0.4]

2.3 [0.4]

<0.001

  1. *All numbers in the rows indicate mean values [standard deviation].
  2. Radiotherapy plans of patients with temporary expanders containing magnetic ports (n = 30) were excluded from the analyses.
  3. CTV indicates clinical target volume; V95% and V105%, volume irradiated with 95% and 105% of isodose.
  4. aRelative volume assessment.
  5. bAbsolute volume assessment.
  6. ¶Student's independent t-test.
  7. †Measured at mammillary level tomography slide.