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PTV
GTV
CTV
GTV
CTV
Adaptive radiation therapy: what to consider
• Choosing measurements:
•
Anatomic changes
•
Biologic changes
•
Dosimetric changes
• Defining target volumes:
•
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
• Logistics and resources