IMRT

Treatment delivery times : susceptibility to intra-fraction motion

Geometric instability in the pelvic region (prostate, rectal cancer treatment)

Poisson Model:

*

Imaging Acquisition

Image Analysis and adaptation

Treatment delivery

Imaging Acquisition

Image Analysis and adaptation

Treatment delivery

15% stability gain

Imaging Acquisition

Image Analysis and adaptation

Treatment delivery

40% stability gain

Ghilezan et al.

* Ghilezan et al. IJROBP (62) 406-417, 2005: Probability of prostate shift > 3mm with filled rectum is 10% in 1min