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CT (+ EUS) are most commonly
used for defining GTV in
oesophageal cancer, but CT is not
able to precisely demonstrate the
proximal and distal margins of
oesophageal tumours in many
cases.
PET-CT enables delineation of the
biologically active tumour volume,
and its depiction of oesophageal
tumours has been shown to
correlate well with patholgy
Standard implementation of PET-CT into the tumour delineation process for radiation
treatment planning remains subject of research and requires further clinical validation