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Table 2 Dose–volume histogram results for PTV2RU

From: Dosimetric feasibility of moderately hypofractionated/dose escalated radiation therapy for localised prostate cancer with intensity-modulated proton beam therapy using simultaneous integrated boost (SIB-IMPT) and impact of hydrogel prostate-rectum spacer

  Range Mean ± SD
Volume (cc) 113.2–329.25 194.58 ± 63.04
Dmax (Gy) 73.2–76.5 74.39 ± 0.86
D2% (Gy) 72.7–74.0 73.22–0.31
Dmean (Gy) 71.54–72.06 71.78 ± 0.11
Dmedian (Gy) 71.82–72.14 71.94 ± 0.1
D95% (Gy) 68.85–71.03 69.92 ± 0.59
D98% (Gy) 66.68–70.16 69.0 ± 0.92
PTV95%IDL (%) 96.16–99.95 98.84 ± 1.21
CI 1.02–1.21 1.12 ± 0.06
HI 1.00–1.06 1.04 ± 0.01
  1. RU = range uncertainty, CI = conformity index = VRI/Volume of PTV, HI = dose homogeneity index = D5%/D95%