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. 2021 Jan 10;22(2):49–57. doi: 10.1002/acm2.13151

Table 1.

The dosimetric parameters in the original plan and plans with head tilt of ±5°.

(A) Original plan a (B) Plan with head tilt of + 5° (C) Plan with head tilt of − 5° Freidman test Wilcoxon signed rank test with Bonferroni's correction
p‐value

p‐value

(A) vs (B)

p‐value

(A) vs (C)

PTV Maximum dose [Gy] 26.7 ± 17.5 26.7 ± 29.4 26.7 ± 17.7 0.47
D98% [Gy] 24.8 ± 0.2 24.7 ± 0.2 24.7 ± 0.2 0.23
HI [%] 6.5 ± 1.4 7.3 ± 2.0 7.0 ± 1.2 0.49
CI 0.8 ± 0.0 0.8 ± 0.0 0.8 ± 0.0 0.65
Lens Maximum dose [Gy] 10.5 ± 2.0 8.5 ± 2.3 12.2 ± 2.0 <0.05 <0.05 <0.05
Mean dose [Gy] 4.2 ± 0.6 3.6 ± 0.6 4.7 ± 0.6 <0.05 <0.05 <0.05
V5Gy [%] 19.8 ± 11.8 11.4 ± 10.7 30.9 ± 14.0 <0.05 <0.05 <0.05
V10Gy [%] 0.5 ± 0.9 0.2 ± 0.4 4.4 ± 9.1 <0.05 0.30 0.10
Bilateral parotid glands Mean dose [Gy] 7.4 ± 1.8 8.2 ± 2.2 6.8 ± 1.5 <0.05 <0.05 <0.05
Median dose [Gy] 5.6 ± 2.6 6.4 ± 3.0 5.2 ± 2.3 <0.05 <0.05 <0.05
V5Gy [%] 50.9 ± 9.1 53.7 ± 10.0 49.7 ± 8.9 <0.05 <0.05 <0.05
V10Gy [%] 34.5 ± 9.3 37.5 ± 9.7 32.9 ± 8.8 <0.05 <0.05 <0.05

PTV, planning target volume; D98%, the dose to volume of 98%; HI, homogeneity index; CI, conformity index; VXXGy, the volume receiving at least XX Gy.

a

Mean virtual orbitomeatal plane angle: 16 ± 2°.