Table 3: The average volume of the prostate (CTV), rectal wall, and the bladder with and without the rectal retractor (range).

With retractor (cm3)Without retractor (cm3)Volume difference (cm3)

Prostate45 (24–67)45 (28–81)0
Rectal wall46 (37–58)35 (25–57)11 (+31%)
Bladder156 (60–371)144 (47–353)12 (+8%)