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Table 2 Dosimetric and anthropometric characteristics* of ipsilateral lung and heart (n = 818)

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 Total n = 242 IBR+ n = 80 IBR- n = 162 P-value¶ Total n = 576 IBR+ n = 82 IBR- n = 494 P-value¶
Ipsilateral lung         
  Volume, cm3 1431.2 [330.2] 1458.6 [318.8] 1417.0 [335.8] 0.36 1369.6 [362.2] 1382.6 [407.7] 1367.4 [354.5] 0.72
  Mean dose, Gy 8.9 [3.8] 8.9 [5.2] 8.9 [2.8] 0.96 14.3 [2.1] 13.8 [2.3] 14.3 [2.1] 0.05
  Minimum dose, Gy 0.3 [1.0] 0.4 [1.7] 0.2 [0.1] 0.11 0.2 [0.1] 0.3 [0.2] 0.2 [0.1] <0.001
  Maximum dose, Gy 51.6 [1.3] 52.0 [1.3] 51.4 [1.3] 0.002 51.8 [1.1] 51.5 [1.5] 51.8 [1.1] 0.06
  V20Gy, % 16.4 [6.1] 15.8 [6.0] 16.7 [6.2] 0.30 28.7 [5.3] 28.1 [5.7] 28.8 [5.2] 0.22
Heart n = 118 n = 35 n = 83   n = 309 n = 37 n = 272  
  Volume, cm3 512.2 [135] 515.9 [115.5] 510.6 [143.0] 0.85 532.2 [117.8] 572.9 [143.1] 526.6 [112.4] 0.024
  Mean dose, Gy 3.3 [1.9] 3.0 [0.9] 3.4 [2.1] 0.32 3.5 [1.5] 3.8 [1.2] 3.5 [1.5] 0.29
  Minimum dose, Gy 0.2 [0.1] 0.2 [0.1] 0.2 [0.1] 0.25 0.3 [0.2] 0.3 [0.02] 0.3 [0.01] 0.27
  Maximum dose, Gy 48.5 [5.5] 48.7 [5.6] 48.4 [5.4] 0.81 47.4 [7.2] 48.5 [5.2] 47.3 [7.5] 0.35
  V25Gy, % 3.7 [2.4] 3.1 [1.7] 4.0 [2.7] 0.07 3.8 [2.6] 3.8 [2.1] 3.8 [2.7] 1.0
  1. *All numbers in the rows indicate mean values [standard deviation].
  2. V20Gy indicates volume of the ipsilateral lung irradiated with 20 Gy; V25Gy, volume of heart irradiated with 25 Gy.
  3. ‡Calculated for left-sided plans only.
  4. ¶Student’s independent t-test.