2576-2577 / 3581
•
Planning CT : 50ml air
•
Inter and intrafraction mvts = negligeable
(Tinger et al., IJROBP 1996)
•
Physiological mvts of the rectum ~ 1cm
(Nuyttens et al., IJROBP 2002)
•
Set-up margin ~ 1cm
Guidelines : CTV
PTV
Myerson et al., Sem Rad Oncol, 2003