Table 1 Organs at risk constraints and planning target volume (PTV) goals for a short course of radiotherapy (25 gy, 5 gy x 5 fractions) for rectal treatment

PTV

23.75 (95%\(\:{\text{D}}_{\text{p}\text{r}\text{e}}\)^^)

> 99%

26.75 (107% \(\:{\text{D}}_{\text{p}\text{r}\text{e}}\)^^)

< 2 cc; ^< 5 cc

27.50 (110% \(\:{\text{D}}_{\text{p}\text{r}\text{e}}\)^^)

< 0.5 cc

Bladder wall

< 18.3

15 cc

< 30

< 0.015 cc

Small Bowel

< 25

5 cc; *10 cc

Femoral Head

< 30

10 cc