![Show Menu](styles/mobile-menu.png)
![Page Background](./../common/page-substrates/page1414.jpg)
• CTV: Prechemotherapy GTV (preferably on MRI) with margins
added to accommodate uncertainties in subclinical tumor
extension and quality of imaging, and fusion into simulation CT
• PTV is between 0.5-1 cm, depending on site and immobilization
Radiation volumes