| TomoHelical | TomoDirect | p- value | |
---|---|---|---|---|
 |  | (Mean ± standard deviation) |  | |
Patient number | 9 (Tangential: 6, 3 ports: 3) | Â | ||
PTV* (cc) | 365 ± 319 |  | ||
Modulation factor | 1.8 - 2.0 | Â | ||
Pitch | 0.25 - 0.287 | Â | ||
Field width | 2.5 - 5.02 | Â | ||
Conformity index | 2.21 ± 0.14 | 4.63 ± 0.61 | 0.004 | |
Uniformity index | 1.07 ± 0.04 | 1.06 ± 0.02 | 0.93 | |
D95% | 96 ± 1 | 97 ± 1 | 0.04 | |
Time (sec) | 259 ± 39 | 271 ± 34 | 0.72 | |
Lung | MLD†(Gy) | 6 ± 1 | 3 ± 1 | 0.05 |
 | V5 Gy (%) | 44 ± 8 | 19 ± 6 | 0.02 |
 | V10 Gy (%) | 22 ± 5 | 12 ± 4 | 0.38 |
 | V20 Gy (%) | 6 ± 1 | 6 ± 2 | 0.85 |
 | V30 Gy (%) | 2 ± 1 | 3 ± 1 | 0.65 |
Cord (maximum dose) | 12 ± 3 | 7 ± 8 | 0.11 |