Table 2A. Dosimetric results of IMRT, VMAT and TOMO for planning dosimetric parameters and organs at risk.
| Variable | IMRT | VMAT | TOMO | |||
|---|---|---|---|---|---|---|
| Mean ± SD | ||||||
| Supine | Prone | Supine | Prone | Supine | Prone | |
| D97 (PTV48.89) | 98.62±1.12 | 98.39±0.95 | 99.02±1.16 | 99.47±0.60 | 98.94±1.03 | 99.21±0.71 |
| Hot spot(Gy) | 53.95±0.78 | 53.52±0.93 | 53.33±0.70 | 53.84±0.90 | 49.76±13.65 | 53.50±0.76 |
| CI | 0.81±0.04 | 0.76±0.08 | 0.85±0.04 | 0.80±0.08 | 0.89±0.05 | 0.88±0.13 |
| HI | 1.07±0.02 | 1.06±0.02 | 1.06±0.02 | 1.05±0.01 | 1.04±0.02 | 1.05±0.01 |
| Small bowelDmax (Gy) | 45.32±12.04 | 41.49±9.88 | 45.16±12.04 | 41.54±10.53 | 44.70±11.84 | 39.81±9.08 |
| BladderDmax (Gy) | 50.39±1.95 | 50.00±1.27 | 50.59±2.49 | 50.16±4.43 | 48.36±4.71 | 50.00±3.47 |
| Mean dose (Gy) | 29.30±5.75 | 32.35±5.58 | 26.66±6.77 | 26.77±6.78 | 21.10±5.68 | 22.24±9.63 |
| V30 (%) | 45.81±23.42 | 57.41±31.58 | 39.19±19.73 | 38.87±25.04 | 14.27±11.17 | 31.75±29.50 |
| V34.98 (%) | 28.98±18.67 | 40.67±25.77 | 24.45±15.77 | 28.95±21.85 | 3.90±5.67 | 8.03±12.46 |
| V40 (%) | 17.04±11.65 | 25.37±19.24 | 17.01±11.95 | 19.34±19.46 | 7.07±7.08 | 13.97±19.18 |
| V44.87 (%) | 5.93±6.14 | 9.04±7.52 | 7.53±6.40 | 9.16±8.18 | 3.90±5.67 | 8.03±12.46 |
| V48.07 (%) | 1.70±2.56 | 2.05±2.69 | 2.20±2.86 | 2.70±3.16 | 1.64±3.77 | 1.43±2.72 |
| V50 (%) | 0.83±1.72 | 0.36±0.66 | 0.71±1.40 | 0.92±1.58 | 0.99±2.75 | 3.32±6.32 |
| Femoral headMean dose (Gy) | 27.60±3.91 | 26.05±8.67 | 28.47±4.25 | 28.49±4.71 | 21.38±9.87 | 17.96±10.20 |
| V30 (%) | 37.10±20.65 | 37.38±40.78 | 41.65±31.38 | 38.55±24.51 | 10.08±7.44 | 12.26±10.05 |
| V40 (%) | 3.62±3.36 | 6.98±14.00 | 3.77±4.24 | 5.99±10.52 | 0.43±0.66 | 2.29±5.12 |
D97: the percentage of the prescribed dose covering 97% volume of PTV; IMRT: intensity modulated radiation therapy; PTV48.89: planning target volume 48.89 Gy; SD: standard deviation; VMAT: volumetric modulated radiation therapy; TOMO: helical tomotherapy; Vx: the percentage of organ receiving more or equal to x Gy.