Target Volume Determination 2015

Do we need adaptive radiotherapy?

Adaptive radiation therapy: what to consider

• Choice of mesurements: – Anatomic changes – Biologic changes – Dose • Defining target volumes:

PTV – The pretreatment GTV/CTV – The pretreatment GTV/CTV adapted to changed OARs – The new GTV & the pretreatment CTV – The new GTV/CTV • Delineation method: – Manual – Autopropagation (autosegmentation) • Treatment planning, dose accumulation & reporting • Resources GTV CTV GTV CTV