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GTV = Gross Tumor Volume
Macroscopic tumor, visible clinically and with imaging
CTV = Clinical Target Volume
Tissue volume that contains a GTV and/or subclinical
microscopic malignant disease, which has to be
eliminated
ITV = Internal target volume
Volume that accounts for internal inter- and intra-
fraction motion and deformation of the CTV
CTV
ITV
GTV
Definitions
(upcoming definitions in the frame of adaptive thinking)
ICRU reports