Imaging for Physicists

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)