Table 3.
The mean values of dosimetric parameters of PTV and OARs for VMAT-FF, HyperArc-FF, and HyperArc-FFF plans
| Structure | Dosimetric parameters | VMAT-FF | HyperArc-FF | HyperArc-FFF | P value* |
|---|---|---|---|---|---|
| PTV | D1% (Gy) | 73.81 ± 1.53 | 73.98 ± 0.86 | 74.45 ± 1.07 | a = n.s., b = n.s. |
| D2% (Gy) | 73.44 ± 1.31 | 73.55 ± 0.85 | 74.12 ± 1.07 | a = n.s., b = n.s. | |
| D98% (Gy) | 64.99 ± 1.56 | 65.09 ± 1.24 | 64.90 ± 1.18 | a = n.s., b = n.s. | |
| D99% (Gy) | 64.07 ± 1.83 | 64.32 ± 1.15 | 63.91 ± 1.23 | a = n.s., b = n.s. | |
| CI | 0.44 ± 0.05 | 0.43 ± 0.06 | 0.42 ± 0.05 | a = n.s., b = n.s. | |
| HI | 0.12 ± 0.04 | 0.12 ± 0.02 | 0.13 ± 0.03 | a = n.s., b = n.s. | |
| Brain | Dmean (Gy) | 17.11 ± 5.25 | 12.63 ± 3.31 | 12.71 ± 3.40 | a = 0.005, b = n.s. |
| Brain stem | D0.1cc (Gy) | 9.28 ± 2.01 | 7.32 ± 1.05 | 7.87 ± 1.27 | a = 0.028, b = n.s. |
| Chiasm | D0.1cc (Gy) | 7.67 ± 2.30 | 6.37 ± 1.08 | 6.71 ± 1.33 | a = n.s., b = n.s. |
| Optic nerve Left | D0.1cc (Gy) | 9.56 ± 4.83 | 8.38 ± 3.82 | 8.47 ± 4.64 | a = n.s., b = n.s. |
| Optic nerve Right | D0.1cc (Gy) | 9.36 ± 4.58 | 8.19 ± 4.56 | 7.12 ± 3.28 | a = n.s., b = n.s. |
| Lens Left | D0.1cc (Gy) | 4.72 ± 1.59 | 4.25 ± 1.57 | 4.14 ± 1.46 | a = n.s., b = n.s. |
| Lens Right | D0.1cc (Gy) | 4.94 ± 2.02 | 4.27 ± 1.59 | 4.25 ± 1.29 | a = n.s., b = n.s. |
Abbreviation: n.s. not significant
*P value corresponds to the paired Wilcoxon signed-rank test: a = VMAT-FF vs HyperArc-FF, b = HyperArc-FF vs HyperArc-FFF