Table 7.
Dosimetric parameters for organs at risk sparing (with boost)
| Variable | Technique |
||||
|---|---|---|---|---|---|
| Conv + E | FIF + E | HT-SIB | TD-3DCRT with HT boost | TD-IMRT with HT boost | |
| Heart | |||||
| Max. (Gy) | 51.35 (3.25) | 47.59 (8.47) | 36.97 (12.06) | 53.01 (7.45) | 46.07 (16.68) |
| Min. (Gy) | 1.97 (0.34) | 0.79 (0.42) | 1.67 (0.36) | 1.43 (0.50) | 1.34 (0.47) |
| Mean (Gy) | 6.07 (1.87) | 4.83 (3.17) | 4.56 (1.07) | 5.06 (2.39) | 4.70 (2.67) |
| V40 | 2.62 (3.84) | 3.74 (5.94) | 0.13 (0.24) | 2.42 (3.80) | 2.46 (4.31) |
| V30 | 3.50 (4.41) | 4.59 (6.85) | 0.73 (1.12) | 3.07 (4.38) | 3.10 (4.97) |
| V20 | 4.47 (4.90) | 5.46 (6.52) | 1.90 (2.40) | 3.76 (4.89) | 3.89 (5.71) |
| V10 | 7.40 (5.25) | 7.41 (8.13) | 5.95 (3.99) | 5.05 (5.78) | 5.16 (6.66) |
| V5 | 30.51 (6.35) | 14.25 (8.78) | 20.33 (6.57) | 16.76 (7.17) | 12.82 (6.66) |
| Total lung | |||||
| Max. (Gy) | 63.09 (3.95) | 62.40 (4.06) | 57.40(3.83) | 64.92 (3.63) | 64.20 (2.48) |
| Min. (Gy) | 0.59 (0.29) | 0.30 (0.16) | 0.83 (0.24) | 0.55 (0.10) | 0.50 (0.09) |
| Mean (Gy) | 9.76 (1.26) | 9.34 (1.34) | 7.24 (0.91) | 8.07 (0.56) | 7.36 (0.96) |
| V40 | 7.73 (1.22) | 8.94 (2.19) | 1.59 (0.88) | 6.43 (1.26) | 5.17 (2.12) |
| V30 | 9.53 (1.22) | 10.98 (2.56) | 4.37 (1.29) | 8.07 (1.31) | 6.80 (2.26) |
| V20 | 12.36 (2.06) | 13.32 (2.89) | 8.38 (1.70) | 10.05 (1.30) | 8.67 (2.29) |
| V10 | 24.60 (5.80) | 22.25 (4.47) | 18.02 (3.51) | 15.97 (1.58) | 14.40 (2.19) |
| V5 | 44.15 (7.97) | 38.48 (6.74) | 36.00 (5.03) | 35.89 (4.74) | 33.91 (4.13) |
3DCRT, three-dimensional conformal radiotherapy; conv, conventional; E, electron boost to tumour bed; FIF, field in field; HT, helical tomotherapy; IMRT, intensity-modulated radiotherapy; max., maximum; min., minimum; SIB, simultaneous integrated boost; 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).