![Show Menu](styles/mobile-menu.png)
![Page Background](./../common/page-substrates/page0868.png)
Margin for rectum (PRV) ?
• Planned rectum differs from treated rectum
• In 50% of the cases organ motion moves rectum
closer during treatment
Higher dose
• In 50% of the cases organ motion moves rectum
away during treatment
Lower dose
On average the planning system predicts the rectum
dose correctly
• Therefore no PRV margin is needed