Table 3. Dose-volumetric comparison of intensity-modulated radiation therapy (IMRT) and RapidArc® [RA; (Varian Medical Systems, Palo Alto, CA)] in patients with primary liver tumour (Group B).
| Variable | Mean±standard deviation |
p–value | |
| IMRT | RA | ||
| Conformity index | 1.1±0.05 | 1.0±0.05 | <0.0001 |
| Mean whole liver dose (Gy) | 23.1±7.4 | 23.7±7.6 | 0.0526 |
| Mean non-target liver dose (Gy) | 16.7±6.7 | 17.4±7.0 | 0.0568 |
| Max spinal cord dose (Gy) | 33.9±7.2 | 27.7±7.2 | 0.0008 |
| V30 Gy of whole liver (%) | 33.3±14.0 | 32.9±14.2 | 0.4597 |
| V30 Gyza of non-target liver (%) | 19.0±11.8 | 18.5±12.3 | 0.4268 |
| V35 Gy of duodenum (%) | 7.1±9.9 | 6.6±8.9 | 0.5518 |
| V35 Gy of stomach (%) | 12.9±15.9 | 9.9±11.8 | 0.0762 |
| V20 Gy of kidney (%) | 11.9±13.7 | 7.3±9.5 | 0.0124 |
| Right kidney (%) | 18.7±25.0 | 12.7±17.3 | 0.0836 |
| Left kidney (%) | 5.0±9.4 | 1.9±4.8 | 0.0848 |
| Monitor unit | 791±138 | 457±77 | <0.0001 |
| Treatment time (s) | 198.6±12.8 | 188.9±0.5 | 0.0359 |
p–values in italics are statistically significant.