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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