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Volumes in ICRU50 - 1993
Clinical Target Volume (CTV)
The CTV is a tissue volume that contains a
demonstrable GTV and/or subclinical,
microscopical malignant disease.
Suspected lymph nodes
Suspected disease around GTV
CTV = GTV (if there) + subclinical disease
Cannot be detected - “subclinical”.
Based on clinical experience.
CTV I - GTV with margin, and CTV II –
lymph nodes