Table 4 Passing rates of Δθ = 90° plans using 3%/3, 3%/2, and 2%/2 mm gamma criteria, along with their Friedman test results.

From: Optimization of collimator angles in dual-arc volumetric modulated arc therapy planning for whole-brain radiotherapy with hippocampus and inner ear sparing

Gamma criteria

Passing rate for VMAT with collimator angles θ1/θ2 (%)

p-value

280°/10°

300°/30°

315°/45°

330°/60°

350°/80°

3%/3 mm

97.6 ± 0.6

98.3 ± 0.6

98.4 ± 0.5

98.5 ± 0.5

97.6 ± 0.6

 < 0.001*

3%/2 mm

95.4 ± 1.0

96.9 ± 1.0

97.1 ± 0.8

97.2 ± 0.8

95.5 ± 1.1

 < 0.001*

2%/2 mm

90.4 ± 2.2

92.7 ± 2.1

92.9 ± 1.8

93.1 ± 1.9

90.4 ± 2.2

 < 0.001*

  1. *Statistically significant (p < 0.05).
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