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Table 1 Mean lung volume, dose, V15, and V20 for each lung in the first and second radiotherapy courses, with 2 weeks interval between radiotherapy courses.

From: Toxic risk of stereotactic body radiotherapy and concurrent helical tomotherapy followed by erlotinib for non-small-cell lung cancer treatment - case report

  First course (0-36 Gy) Second course (36-54 Gy)
  Right lung volume, 1167 ml Left lung volume, 1244 ml Right lung volume, 1385 ml Left lung volume, 1490 ml
Mean lung dose (Gy) 10.77 Gy 4.74 Gy 4.63 Gy 1.96 Gy
V15* (%) 27% 2% 13% 0%
V20* (%) 22% 0% 8% 0%
  1. *V15 and V20 are the percentages of lung volume that receive at least 15 and 20 Gy in the ipsilateral and contralateral lungs.