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Table 1 Summary of plan quality. Prostate values are shown as the median, with the minimum and maximum values in parentheses

From: Quality assurance of non-coplanar, volumetric-modulated arc therapy employing a C-arm linear accelerator, featuring continuous patient couch rotation

Criteria Trajectory
1 2 3 4 5 6 7
C-shaped phantom
 PTV D95% (Gy) ≥ 50 Gy (100%) 50.0 50.0 50.1 50.2 50.0 50.0 50.0
 PTV Dmax (Gy) ≤ 55 Gy (110%) 54.9 54.9 55.0 54.9 55.0 54.9 55.0
 Core D2cc (Gy) ≤ 30 Gy (60%) 29.6 29.7 30.0 29.2 28.9 29.4 28.7
Prostate (n = 5)
 PTV Dmean (Gy) >  75.2 Gy (99%) 76.0 [76.0–76.0] 76.0 [76.0–76.0] 76.0 [76.0–76.0] 76.0 [76.0–76.0] 76.0 [76.0–76.0] 76.0 [76.0–76.0] 76.0 [76.0–76.4]
D95% (Gy) >  68.4 Gy (90%) 71.6 [71.2–72.7] 71.5 [71.3–72.7] 71.4 [71.1–72.9] 71.7 [71.6–72.5] 72.5 [71.9–73.1] 71.3 [70.0–72.9] 71.8 [71.1–72.9]
V90% (%) >  95% 99.8 [99.2–100.0] 99.8 [99.4–100.0] 99.7 [99.2–99.9] 99.8 [99.6–100.0] 99.9 [99.7–100.0] 99.1 [98.3–99.9] 99.7 [99.2–100.0]
Dmax (Gy) ≤ 83.6 Gy (110%) 80.6 [78.7–82.1] 80.9 [79.1–81.6] 81.0 [80.4–81.8] 80.7 [80.4–81.5] 81.1 [79.5–83.0] 81.5 [79.8–81.8] 81.0 [80.6–83.6]
 Bladder wall V40Gy (%) <  65% 22.0 [11.8–31.4] 22.9 [11.8–28.8] 21.2 [13.3–32.5] 22.0 [11.5–27.7] 24.9 [11.8–29.6] 26.0 [13.2–30.5] 25.3 [13.7–32.0]
V70Gy (%) <  35% 12.1 [5.5–17.0] 12.1 [5.6–17.5] 11.3 [5.6–17.0] 12.1 [5.5–16.7] 12.3 [5.7–17.0] 12.2 [6.1–16.9] 12.2 [6.0–16.6]
 Rectal wall V40Gy (%) <  65% 40.3 [27.6–41.0] 40.4 [28.5–42.0] 40.3 [27.6–43.9] 39.3 [29.2–41.6] 37.0 [29.9–42.7] 40.7 [28.1–43.3] 40.9 [28.8–43.1]
V60Gy (%) <  35% 24.8 [12.5–26.0] 23.8 [12.1–26.8] 23.7 [12.5–26.7] 23.6 [13.7–25.8] 21.2 [13.1–24.8] 24.7 [12.3–25.5] 23.6 [12.9–25.9]
V70Gy (%) <  25% 9.2 [3.7–13.6] 9.5 [3.4–14.0] 9.6 [2.7–14.2] 9.2 [4.0–11.8] 11.6 [4.6–11.7] 9.1 [3.3–12.1] 11.4 [3.7–12.4]
V76Gy (%) <  1% 0.0
[0.0–0.0]
0.0
[0.0–0.0]
0.0
[0.0–0.0]
0.0
[0.0–0.0]
0.0
[0.0–0.0]
0.0
[0.0–0.0]
0.0
[0.0–0.0]
  1. Abbreviations: Dxx%(cc) dose covering xx% (cc) of the volume, Dmax maximum dose, Vyy Gy volume receiving yy Gy, Vyy% volume receiving yy % isodose, PTV planning target volume