Table 2.
Summary of the target volume dosimetry.
| IMRT | VMAT | HT | IMPT-1 | IMPT-2 | P < 0.05 | |
|---|---|---|---|---|---|---|
| D2(Gy) | 13.2 ± 0.1 | 13.1 ± 0.07 | 12.7 ± 0.1 | 13.0 ± 0.4 | 14.74 ± 1.24 | a,b,d,f,g,h,i,j |
| D98(Gy) | 11.8 ± 0.1 | 11.8 ± 0.2 | 12.0 ± 0.1 | 11.9 ± 0.5 | 11.84 ± 0.09 | b,f, g,h,j |
| Dmax(Gy) | 14.1 ± 0.3 | 13.6 ± 0.2 | 13.0 ± 0.1 | 14.6 ± 0.7 | 21.81 ± 3.93 | a,b,c,d,e,f,g,h,i,j |
| Dmean(Gy) | 12.6 ± 0.03 | 12.6 ± 0.007 | 12.5 ± 0.1 | 12.6 ± 0.001 | 12.75 ± 0.14 | b,d,f,g,h,i,j |
| Dmin(Gy) | 8. 4 ± 1.2 | 5.6 ± 2.0 | 10.2 ± 0.4 | 6.6 ± 2.4 | 6.31 ± 1.72 | a,b,c,d,e,f, g,i |
| Target coverage(%) | 96.2 ± 0.4 | 96.2 ± 1.3 | 98.2 ± 0.5 | 96.0 ± 0.8 | 96.36 ± 1.03 | b,f,i |
| CI | 0.86 ± 0.02 | 0.84 ± 0.03 | 0.84 ± 0.03 | 0.84 ± 0.03 | 0.80 ± 0.05 | b,g,j |
| HI | 0.1 2 ± 0.01 | 0.11 ± 0.02 | 0.05 ± 0.01 | 0.10 ± 0.07 | 0.24 ± 0.11 | b,d,f, g,h,i,j |
IMRT, intensity-modulated radiation therapy; VMAT, volumetric-modulated arc therapy; HT, helical tomotherapy; IMPT, intensity-modulated proton therapy; Dx, dose received by x% of the volume; CI, conformity index; HI, homogeneity index; a, IMRT vs VMAT; b, IMRT vs HT; c, IMRT vs PT; d, VMAT vs HT; e, VMAT vs PT; f, HT vs PT; g, IMRT vs IMPT-2; h, VMAT vs IMPT-2; I, HT vs IMPT-2; j, IMPT-1 vs IMPT-2.