Table 3.
Results of the dosimetric comparison between tomotherapy and intensity-modulated radiotherapy (IMRT)
| Volume | Indices | Tomotherapy | IMRT |
|---|---|---|---|
| Planning Target Volume (PTV) |
V95 (%) |
97 |
96.3 |
| D95 (Gy) |
52.4 |
51.7 |
|
| D98(Gy) |
50.6 |
50.9 |
|
| D2 (Gy) |
55.2 |
54.6 |
|
| D_mean (Gy) |
53.8 |
53.4 |
|
| SD* |
1.06 |
0.92 |
|
| DSC† |
0.88 |
0.91 |
|
| HI†† |
0.086 |
0.068 |
|
| Gastrointestinal |
D2 (Gy) |
50.8 |
51.8 |
| V45 (%) |
7.3 |
10.3 |
|
| V20 (%) |
45.6 |
45.3 |
|
| D200cc (Gy) |
41.3 |
46.5 |
|
| Contralateral kidney |
D2 (Gy) |
8.3 |
8.9 |
| EUD§ (Gy) |
3.9 |
3.5 |
|
| Spinal canal |
D2 |
32.5 |
39.1 |
| Healthy tissue | Integral dose (Joules) |
354.1 |
294.7 |
| Integral dose RVRII (Joules) | 321.5 | 259.6 |
* SD=Standard Deviation, †DSC=Dice Similarity Coefficient, †† HI=Homogeneity Index, § EUD= Equivalent Uniform Dose, II RVR= Remaining Volume at Risk.
(Results in bold indicate statistical significance at the p<0.05 level).