Rectum

IMRT

IMPT

p value

Metric

Average

STDEV

Average

STDEV

Dmean (Gy/CGE)

21.0%

5.0%

12.8%

6.1%

<0.0001

D50%

11.4%

4.2%

1.6%

3.1%

<0.0001

D35%

18.1%

5.3%

5.9%

8.1%

<0.0001

D25%

28.2%

6.4%

13.7%

13.8%

0.0007

D15%

44.1%

9.6%

31.2%

19.7%

0.0141

D2cc

77.8%

15.3%

79.3%

15.5%

0.6435