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PTV pathological lymph nodes
CBCT 1
st
treatment
CBCT 24
th
treatment
PTV (blue)
GTV on 10 CBCT (red)
Anne Ramlov, Radiother Oncol, 2017
Assumption:
Lymph nodes are in a fixed relation to bony anatomy
Bony registration aligns pathological lymph node target
Most often pathological lymph nodes shrink during RT