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Table 4 Average dose-volumetric parameters of sum plans

From: The effect of extremely narrow MLC leaf width on the plan quality of VMAT for prostate cancer

  Original plan Shifted plan p
Boost target volume
D1% (Gy) 83.00 ± 0.39 82.55 ± 0.34 <0.001
Mean dose (Gy) 81.45 ± 0.32 81.12 ± 0.28 0.001
D99% (Gy) 77.98 ± 0.44 78.11 ± 0.37 0.014
D95% (Gy) 79.76 ± 0.33 79.68 ± 0.29 0.411
Primary target volume
Mean dose (Gy) 77.33 ± 2.22 77.04 ± 2.25 0.681
D99% (Gy) 55.11 ± 4.17 55.01 ± 4.23 0.267
D95% (Gy) 59.42 ± 6.27 59.16 ± 6.32 0.896
Rectal wall
V70Gy (%) 10.56 ± 3.08 10.38 ± 3.08 0.856
V47Gy (%) 32.40 ± 10.04 31.21 ± 9.51 0.700
D50% (Gy) 32.18 ± 11.35 31.22 ± 11.43 0.791
Mean dose (Gy) 36.68 ± 7.05 36.06 ± 6.97 0.783
Bladder
V70Gy (%) 6.44 ± 4.42 6.37 ± 4.36 0.958
V47Gy (%) 14.35 ± 8.62 14.19 ± 8.51 0.954
D50% (Gy) 12.58 ± 10.11 12.39 ± 10.00 0.952
Mean dose (Gy) 20.62 ± 9.52 20.43 ± 9.46 0.949
Right femoral head
D50% (Gy) 15.09 ± 2.31 14.88 ± 2.39 0.786
Maximum dose (Gy) 27.51 ± 4.10 27.54 ± 4.44 0.981
Left femoral head
D50% (Gy) 15.01 ± 3.55 14.79 ± 3.51 0.846
Maximum dose (Gy) 26.68 ± 3.62 27.34 ± 4.65 0.618
Whole body including target volume
V81Gy (cc) 60.92 ± 14.85 48.96 ± 11.68 0.007
Body – primary target volume
V81Gy (cc) 0.12 ± 0.13 0.07 ± 0.08 0.083
V72.9Gy (cc) 19.23 ± 4.74 18.77 ± 4.59 0.074
V64.8Gy (cc) 43.53 ± 9.61 43.08 ± 9.65 0.290
V50.4Gy (cc) 117.78 ± 23.83 117.06 ± 24.26 0.222
V45.36Gy (cc) 163.60 ± 31.56 163.02 ± 32.28 0.359
V40.32Gy (cc) 226.73 ± 42.88 226.39 ± 44.16 0.707
V8.1Gy (cc) 2963.81 ± 366.10 2979.18 ± 366.93 0.072
  1. Abbreviations: D n%  Dose received by at least n% volume of the target volume, V nGy the percent volume of a structure irradiated by at least n Gy