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Breathing, digestion…
Strategies to account for this motion:
Seppenwoolde et al. IJROBP 2002
Motion control (extracranial)
Features of SABR
Modify respiration/ adaptive interaction Active Breathing Control (ABC)
Breath hold
Gating
planning & treatment
Consider fiducials, e.g. liver
13
Tracking
Adequate expansion of PTV
4D-CT: ITV, MidV, MidP…
planning