![Show Menu](styles/mobile-menu.png)
![Page Background](./../common/page-substrates/page0457.png)
When choosing gating threshold
(…size of gating window…)
Acceptable residual motion ?
→
CTV-PTV margin!
Breathing technique
Duty cycle
15%
Duty cycle
30%
Decreased
tumour motion
Increased
delivery time
→
risk of patient
movement due to
discomfort