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PTV
GTV
CTV
GTV
CTV
Adaptive radiation therapy: what to consider
• Choice of mesurements:
– Anatomic changes
– Biologic changes
– Dose
• Defining target volumes:
– 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
Do we need adaptive radiotherapy?