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Table 2 Summary of the CRT boost treatment

From: Dosimetric comparison of intensity-modulated, conformal, and four-field pelvic radiotherapy boost plans for gynecologic cancer: a retrospective planning study

Structure Parameter All patients Median (Range) Patient 4 Grade 3 Rectal Bleeding Patient 10 Grade 3 Rectal Bleeding
Tumor Dose (Gy) 25.2 (20–30) 20 30
  PTV (cm3) 151 (58–512) 512 393
  CN 0.58 (0.34–0.78) 0.74 0.75
Rectum Volume1 (cm3) 67 (29–147) 61 73
  Overlap with PTV2 (%) 15 (1–56) 41 46
  V50 (cm3) 57 (22–128) 60 63
  V70 (cm3) 45 (16–113) 58 53
Bladder Volume1 (cm3) 183 (49–555) 148 325
  Overlap with PTV2 (%) 11 (4–35) 35 20
  V50% (cm3) 125 (32–187) 148 161
  V70% (cm3) 79 (23–145) 145 106
  1. (1) Rectal and bladder contoured volume before expansion to form the planning risk volume (PRV)
  2. (2) Percentage of the rectum or bladder volume within the PTV
  3. (V50%)The volume receiving ≥ 50% of the prescribed dose
  4. (V70%) The volume receiving ≥ 70% of the prescribed dose
  5. (PTV) Planning target volume
  6. (CN) Conformation Number.