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From GTV to CTV
What should be the margin around the nodal GTV?
Apisarnthanarax S, et al. IJROBP 2005
MDAH Study, 96 nodes with ECE, head and neck cancer
No corellation: nodal size - ECE distance
•
Median ECE: 1.6 mm
• Range: 0.4 – 9 mm
•
96 % nodes: < 5mm