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4D Target Volumes
Target Delineation using 4DCT Datasets
Helical CT Dataset
x
y
GTV
PTV = GTV + 10 mm S/I,
5 mm A/P,
5 mm L/R
4DCT Datasets
GTV 0%
(Inspiration)
GTV 50%
(Expiration)
Fused GTV (ITV)
PTV = Fused GTV + 5 mm
Symmetric Margin
x
z
x
y