Table 2.
Results of dosimetric comparison for PTV from DVH ()
| Parameters | IMRT | TD | VMAT | TH | p-value | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| IMRT vs TD | IMRT vs VMAT | IMRT vs TH | TD vs VMAT | TD vs TH | VMAT vs TH | |||||
| D98% (Gy) | 46.86±0.15 | 48.91±0.06 | 47.72±0.15 | 48.92±0.08 | 0.000 | 0.000 | 0.000 | 0.000 | 0.914 | 0.000 |
| D2% (Gy) | 53.34±0.07 | 52.80±0.09 | 53.33±0.10 | 52.38±0.10 | 0.000 | 0.951 | 0.000 | 0.003 | 0.007 | 0.000 |
| Dmean (Gy) | 51.21±0.09 | 45.84±0.52 | 51.39±0.12 | 46.47±0.49 | 0.000 | 0.165 | 0.000 | 0.000 | 0.036 | 0.000 |
| V95% (%) | 99.96±0.22 | 99.16±0.07 | 98.06±0.23 | 99.30±0.08 | 0.000 | 0.000 | 0.000 | 0.000 | 0.044 | 0.000 |
| Cold spot volume (%) | 1.68±0.16 | 0.53±0.06 | 0.78±0.13 | 0.39±0.06 | 0.000 | 0.000 | 0.000 | 0.103 | 0.011 | 0.021 |
| CI | 0.905±0.004 | 0.830±0.007 | 0.920±0.004 | 0.850±0.008 | 0.000 | 0.003 | 0.000 | 0.000 | 0.004 | 0.000 |
| HI | 0.091±0.002 | 0.058±0.002 | 0.084±0.002 | 0.051±0.002 | 0.000 | 0.010 | 0.000 | 0.000 | 0.025 | 0.000 |
| MUs | 1191.08±32.55 | 3415.33±96.27 | 451.42±19.11 | 3441.42±93.43 | 0.000 | 0.000 | 0.000 | 0.000 | 0.363 | 0.000 |
| Time (s) | 421.66±4.76 | 327.10±6.61 | 189.27±1.29 | 245.46±6.40 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 |
Abbreviations: PTV, planning target volume; DVH, Dose–Volume Histogram; IMRT, intensity-modulated radiotherapy; TD, TomoDirect; VMAT, volumetric modulated arc therapy; TH, TomoHelical; HI, homogeneity index; CI, conformity index; MUs, monitor units.