Table 2 Averaged results and comparison of dosimetric parameters using dac-VMAT and sapf-VMAT. Each value was calculated based on the data from 20 patients and was expressed as mean ± standard deviation (SD)
Structures | Dosimetric Parameters | dac-VMAT | sapf-VMAT | p-value |
|---|---|---|---|---|
Whole Brain PTV | V30Gy (%) | 94.67 ± 0.25 | 94.79 ± 0.13 | p = 0.358 |
D2% (Gy) | 33.04 ± 0.32 | 33.12 ± 0.34 | p = 0.842 | |
D98% (Gy) | 26.11 ± 0.06 | 25.84 ± 0.03 | p = 0.401 | |
HI | 0.22 ± 0.02 | 0.23 ± 0.01 | p = 0.435 | |
Hippocampus | D100% (Gy) | 9.23 ± 0.13 ** | 7.86 ± 0.08 ** | p < 0.001 |
Dmax (Gy) | 16.33 ± 0.63 ** | 13.23 ± 0.46 ** | p < 0.001 | |
Dmean (Gy) | 10.85 ± 0.21 ** | 9.16 ± 0.10 ** | p < 0.001 | |
Left Optic Nerve | Dmax (Gy) | 30.80 ± 0.66 | 31.23 ± 0.48 | p = 0.791 |
Right Optic Nerve | Dmax (Gy) | 30.82 ± 0.55 | 30.51 ± 0.61 | p = 0.567 |
Optic Chiasm | Dmax (Gy) | 32.36 ± 0.26 | 32.48 ± 0.25 | p = 0.939 |
Left Eye | Dmax (Gy) | 16.83 ± 0.75 | 17.12 ± 0.47 | p = 0.481 |
Dmean (Gy) | 10.46 ± 0.56 * | 9.34 ± 0.32 * | p = 0.026 | |
Right Eye | Dmax (Gy) | 17.26 ± 0.63 | 17.21 ± 0.26 | p = 0.991 |
Dmean (Gy) | 10.36 ± 0.46 * | 9.07 ± 0.33 * | p = 0.042 | |
Left Lens | Dmax (Gy) | 7.32 ± 0.54 | 7.33 ± 0.25 | p = 0.679 |
Right Lens | Dmax (Gy) | 7.53 ± 0.44 | 7.12 ± 0.41 | p = 0.985 |
Total MU | 919.69 ± 130.95 | 1085.58 ± 153.57 | p = 0.053 | |
Beam-on time (minute) | 3.14 ± 0.11 | 3.04 ± 0.22 | p = 0.446 | |
Delivery time (minute) | 3.41 ± 0.11 | 3.62 ± 0.22 | p = 0.437 | |