702-703 / 3581
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
)