Table 5.
Dosimetric parameters for planning target volume (PTV) boost coverage (with boost)
| Variable | Technique |
||||
|---|---|---|---|---|---|
| Conv + E | FIF + E | HT-SIB | TD-3DCRT with HT Boost | TD-IMRT with HT Boost | |
| Left PTV | |||||
| Max. (Gy) | 69.16 (2.15) | 68.79 (2.17) |
64.73 (0.49) | 68.45 (2.87) | 68.89 (2.25) |
| Min. (Gy) | 48.41 (16.93) | 47.50 (18.33) |
54.23 (2.73) | 49.76 (20.85) | 45.21 (19.88) |
| Mean (Gy) | 64.33 (0.83) | 63.61 (1.17) |
62.45 (0.76) | 63.53 (0.36) | 64.48 (0.51) |
| V90 (%) | 98.72 (1.32) | 98.00 (2.13) |
99.79 (0.30) | 99.52 (0.95) | 99.52 (0.95) |
| V95 (%) | 89.59 (3.13) | 91.10 (4.54) |
98.93 (0.92) | 98.33 (1.75) | 99.34 (1.03) |
| V107 (%) | 0.01 (0.02) | 0.15 (0.30) |
0.00 (0.00) | 0.52 (1.05) | 0.27 (0.54) |
| V110 (%) | 0.00 (0.00) | 0.00 (0.00) |
0.00 (0.00) | 0.10 (0.20) | 0.02 (0.03) |
| Right PTV | |||||
| Max. (Gy) | 69.62 (0.89) | 69.00 (1.39) |
64.66 (0.98) | 67.94 (2.99) | 68.02 (1.67) |
| Min. (Gy) | 52.19 (16.27) | 51.19 (15.68) |
52.39 (5.28) | 56.18 (4.77) | 56.28 (5.36) |
| Mean (Gy) | 65.13 (1.12) | 64.65 (0.74) |
62.41 (0.63) | 63.60 (0.26) | 64.46 (0.42) |
| V90 (%) | 99.59 (0.64) | 99.27 (0.97) |
99.78 (0.23) | 99.13 (0.16) | 99.79 (0.28) |
| V95 (%) | 96.47 (3.70) | 93.86 (4.70) |
98.16 (1.78) | 98.87 (0.24) | 99.20 (0.55) |
| V107 (%) | 0.02 (0.04) | 0.002 (0.004) |
0.12 (0.28) | 0.24 (0.48) | 0.16 (0.41) |
| V110 (%) | 0.00 (0.00) | 0.00 (0.00) | 0.00 (0.00) | 0.08 (0.20) | 0.00 (0.00) |
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., Sunnnyvale, CA); Vx, target volume receiving at least X% of prescription dose.
The values in the table are expressed as mean (standard deviation).