Skip to main content

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)

From: Volumetric modulated arc therapy (VMAT) for hippocampal-avoidance whole brain radiation therapy: planning comparison with Dual-arc and Split-arc partial-field techniques

StructuresDosimetric Parametersdac-VMATsapf-VMATp-value
Whole Brain PTVV30Gy (%)94.67 ± 0.2594.79 ± 0.13p = 0.358
D2% (Gy)33.04 ± 0.3233.12 ± 0.34p = 0.842
D98% (Gy)26.11 ± 0.0625.84 ± 0.03p = 0.401
HI0.22 ± 0.020.23 ± 0.01p = 0.435
HippocampusD100% (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 NerveDmax (Gy)30.80 ± 0.6631.23 ± 0.48p = 0.791
Right Optic NerveDmax (Gy)30.82 ± 0.5530.51 ± 0.61p = 0.567
Optic ChiasmDmax (Gy)32.36 ± 0.2632.48 ± 0.25p = 0.939
Left EyeDmax (Gy)16.83 ± 0.7517.12 ± 0.47p = 0.481
Dmean (Gy)10.46 ± 0.56 *9.34 ± 0.32 *p = 0.026
Right EyeDmax (Gy)17.26 ± 0.6317.21 ± 0.26p = 0.991
Dmean (Gy)10.36 ± 0.46 *9.07 ± 0.33 *p = 0.042
Left LensDmax (Gy)7.32 ± 0.547.33 ± 0.25p = 0.679
Right LensDmax (Gy)7.53 ± 0.447.12 ± 0.41p = 0.985
Total MU919.69 ± 130.951085.58 ± 153.57p = 0.053
Beam-on time (minute)3.14 ± 0.113.04 ± 0.22p = 0.446
Delivery time (minute)3.41 ± 0.113.62 ± 0.22p = 0.437
  1. * p < 0.05;
  2. ** p < 0.005 (paired t-test)