Table 3.
Dosimetric parameters for organ at risk sparing (without boost)
| Variable | Technique |
||||
|---|---|---|---|---|---|
| Conv | FIF | HT-IMRT | TD-3DCRT | TD-IMRT | |
| Heart | |||||
| Max. (Gy) | 49.99 (1.57) | 47.09 (6.01) | 42.88 (6.61) | 50.19 (12.13) | 48.11 (13.50) |
| Min. (Gy) | 2.51 (2.60) | 0.61 (0.21) | 1.57 (0.32) | 0.78 (0.12) | 0.70 (0.11) |
| Mean (Gy) | 5.33 (1.67) | 3.67 (2.59) | 4.68 (0.96) | 3.65 (1.96) | 3.38 (2.04) |
| V40 | 2.39 (2.95) | 2.99 (4.62) | 0.20 (0.32) | 2.49 (2.89) | 2.31 (3.18) |
| V30 | 3.25 (3.37) | 3.84 (5.25) | 1.04 (1.10) | 3.27 (3.36) | 3.08 (3.71) |
| V20 | 4.15 (3.75) | 4.65 (5.74) | 2.77 (1.90) | 4.10 (3.86) | 3.93 (4.26) |
| V10 | 5.79 (4.36) | 5.89 (6.35) | 7.44 (3.57) | 5.41 (4.68) | 5.16 (5.07) |
| V5 | 19.04 (8.51) | 8.17 (7.21) | 19.33 (7.24) | 7.25 (5.90) | 6.81 (6.04) |
| Total lung | |||||
| Max. (Gy) | 51.24 (1.23) | 49.68 (1.5) | 50.16 (2.07) | 53.35 (1.49) | 52.72 (1.26) |
| Min. (Gy) | 0.391 (0.30) | 0.17 (0.13) | 0.93 (0.348) | 0.38 (0.89) | 0.35 (0.07) |
| Mean (Gy) | 6.75 (1.21) | 5.86 (1.81) | 5.99 (0.981) | 5.30 (0.76) | 4.76 (1.06) |
| V40 | 5.51 (1.87) | 5.73 (2.97) | 0.97 (0.72) | 5.18 (1.19) | 4.17 (1.75) |
| V30 | 7.36 (2.02) | 7.98 (3.35) | 3.67 (1.18) | 6.93 (1.33) | 5.91 (1.91) |
| V20 | 9.03 (2.23) | 9.63 (3.66) | 7.25 (1.65) | 8.57 (1.42) | 7.56 (2.02) |
| V10 | 13.52 (3.28) | 12.64 (4.36) | 14.13 (2.44) | 11.33 (1.69) | 10.28 (2.38) |
| V5 | 26.55 (6.93) | 19.09 (6.11) | 26.37 (7.70) | 15.80 (2.20) | 14.34 (2.94) |
3DCRT, three-dimensional conformal radiotherapy; conv, conventional; FIF, field in field; HT, helical tomotherapy; IMRT, intensity-modulated radiotherapy; max., maximum; min., minimum; TD, TomoDirect™ (Accuray Inc., Sunnyvale, CA); Vx, volume of OAR receiving at least x Gy.
The values in the table are expressed as mean (standard deviation).