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Table 2 Bladder and small bowel DVH metrics for the prone and supine orientations. (average ± standard deviation)

From: The effect of prone and supine treatment positions for the pre-operative treatment of rectal cancer on organ-at-risk sparing and setup reproducibility using volumetric modulated arc therapy

DVH Metric

Prone

Supine

p value

Bladder mean dose (Gy)

37.1 ± 4.2

37.3 ± 4.1

0.93

Bladder V40 (%)

45.4 ± 16.3

46.0 ± 12.6

0.93

Bladder V30 (%)

65.2 ± 14.4

68.8 ± 18.5

0.67

Small bowel mean dose (Gy)

16.7 ± 6.4

19.8 ± 6.3

0.32

Small bowel V50.4 (cc)

19.7 ± 27.8

10.3 ± 13.9

0.38

Small bowel V45 (cc)

38.9 ± 44.7

37.5 ± 51.6

0.95

Small bowel V30 (cc)

77.6 ± 70.6

104.9 ± 106.1

0.55

Small bowel V20 (cc)

134.5 ± 99.1

201.2 ± 161.7

0.33

Small bowel V15 (cc)

217.2 ± 135.1

260.2 ± 198.7

0.61