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GEC-ESTRO Recommendations for APBI PTV
Definition After Closed Cavity Surgery
Seven steps for target delineation after closed cavity surgery:
1. CT with radiopaque markers in the
skin scar
and
areola
2. Delineation of
clips
(relevant and irrelevant)
3. Delineation of surgical bed –
whole surgical scar (WS)
inside breast if visible.
4. Delineation of
ImTV (Imaging correlated Target Volume)
regarding distance from skin and chest.
5. Delineation of
ETB (Estimated Tumour Bed)
6. Delineation of
CTV
(Clinical Target Volume) ETB+ margin,
excluding 5-10mm from skin and chest wall. CTV must
include relevant clips, relevant WS, and ImTV.
7. Delineation of
PTV
(Planning Target Volume) if needed in
big breasts or bad defined ETB