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Functional imaging to assist volume definition
Considering FDG-PET
Advantages -Accuracy in disease delineation
• PET-CT can more closely reflect pathological staging
• Improve inter-observer concordance
• Tumour
• Involved lymph node delineation
• Certainty results in smaller treatment volumes
• Less normal tissue irradiation
• Commonly used for radical radiotherapy planning
• difficulties in distinguishing tumour,
• necrosis,
• atelectasis
• normal tissue boundaries