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Summary
• Target definition
– ITV, free breathing
– Exhale – gating
– Mid-ventilation, free breathing
• Dose calculation
– Accurate dose model, also during IMRT/RapidArc
optimization
– In older studies: prescribed dose ≠ actual dose (deviations of
up to 30%!)
• Position verification with cone-beam CT allows
accurate targeting of the tumor (stereotactic body
radiotherapy)