IGRT 2016 Madrid

Intrafraction motion Negligeable ( Langen KM IJROBP 2001 )

BUT…

1. Amplitude of motion increases with elapsed time ( Ghilezan M, IJROBP 2004 )

How much time between daily image and treatment is acceptable?

2. Correlated with rectal filling

Diet advices and mild laxatives may help : 2-fold reduction of the SD for P motion ( Nijkamp J IJROBP 2008 )