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Table 3 Dose volume relations to organs at risk in patients lying in prone or 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

  Prone Supine
Organs at risk Mean dose ± SD (Gy) Range (Gy) Mean defined volume (cm3) Range (cm3) Mean dose ± SD (Gy) Range (Gy) Mean defined volume (cm3) Range (cm3) p-value*
Small bowel 5.8 ± 5.9 0.4 – 23.2 1451 361 - 2907 6.0 ± 5.2 0.6 - 20.0 1374 793 – 2204 0.85
Total bowel 5.8 ± 4.5 1.1 – 18.9 2977 1718 – 5365 4.8 ± 3.4 0.3 – 13.9 2973 1323 – 5454 0.29
Bladder 33.5 ± 11.7 6.9 – 46.3 211 45 – 647 32.6 ± 10.7 7.1 – 47.3 261 76 – 685 0.74
  1. *Comparisons of mean doses to organs at risk between prone and supine position