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Table 4 Dose volume distribution in small bowel and total bowel in prone and supine position

From: A randomized study of the effect of patient positioning on setup reproducibility and dose distribution to organs at risk in radiotherapy of rectal cancer patients

  Small bowel Total bowel
  Prone Supine Prone Supine   Prone Supine Prone Supine  
Dose- level Mean volume ± SD (cm3) Mean volume ± SD (cm3) Proportion irradiated (%) Proportion irradiated (%) p-value* Mean volume ± SD (cm3) Mean volume ± SD (cm3) Proportion irradiated (%) Proportion irradiated (%) p-value*
V5 250 ± 190 305 ± 238 20 23 0.25 486 ± 278 533 ± 326 18 18 0.49
V10 231 ± 189 272 ± 231 19 20 0.39 433 ± 261 460 ± 299 16 16 0.67
V15 159 ± 162 172 ± 198 13 13 0.75 346 ± 254 304 ± 293 13 10 0.49
V20 117 ± 148 124 ± 174 10 9 0.84 277 ± 242 223 ± 269 10 8 0.45
V25 96 ± 135 109 ± 156 8 8 0.70 243 ± 229 192 ± 227 9 6 0.31
V30 81 ± 119 94 ± 131 7 7 0.64 214 ± 206 165 ± 185 8 6 0.26
V35 71 ± 109 84 ± 117 6 6 0.60 192 ± 187 147 ± 163 7 5 0.25
V40 64 ± 102 76 ± 108 6 6 0.60 180 ± 178 135 ± 149 7 5 0.22
V45 50 ± 89 52 ± 74 4 4 0.90 141 ± 149 98 ± 105 6 3 0.14
  1. *Comparisons of mean volumes to small bowel and total bowel between prone and supine position