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Table 3 Reduction in mean lung dose (Gy) using different PTV definitions.

From: A dosimetric analysis of respiration-gated radiotherapy in patients with stage III lung cancer

  Mean lung dose (Gy) Absolute (Gy) and relative (%) reduction in mean lung dose
Patient PTVroutine PTVall phases vs. PTVroutine PTVgating vs. PTVroutine PTVgating vs. PTVall phases
1 25.2 2.7 (10.7%) 3.6 (14.3%) 0.9 (4.0%)
2 20.6 1.6 (7.8%) 2.4 (11.7%) 0.8 (4.2%)
3 18.9 1.6 (8.5%) 2.2 (11.6%) 0.6 (3.5%)
4 23.0 1.3 (5.7%) 3.0 (13.0%) 1.7 (7.8%)
5 12.8 1.1 (8.6%) 1.5 (11.7%) 0.3 (2.6%)
6 18.7 1.7 (9.1%) 2.5 (13.4%) 0.8 (4.7%)
7 23.1 3.1 (13.4%) 4.2 (18.2%) 1.1 (5.5%)
8 10.4 0.7 (6.7%) 0.7 (6.7%) 0.0 (0.0%)
9 19.3 1.1 (5.7%) 2.7 (14.0%) 1.6 (8.8%)
10 20.2 3.0 (14.9%) 3.8 (18.8%) 0.8 (4.7%)
11 17.2 1.0 (5.8%) 2.1 (12.2%) 1.1 (6.8%)
12 19.5 3.2 (16.4%) 3.3 (16.9%) 0.1 (0.6%)
13 14.2 1.2 (8.5%) 2.4 (16.9%) 1.2 (9.3%)
14 15.7 2.1 (13.4%) 2.6 (16.6%) 0.5 (3.7%)
15 27.8 3.0 (10.8%) 4.7 (16.9%) 1.7 (6.9%)
Mean 19.1 1.9 (9.7%) 2.8 (14.2%) 0.9 (4.9%)
SD 4.6 0.9 (3.4%) 1.0 (3.2%) 0.5 (2.7%)
  1. PTV = planning target volume