Definition of volumes in radiotherapy.
|Gross tumour volume |
|The gross, palpable, or visible/clinically demonstrable location and extent of the malignant growth|
|Clinical target volume|
|Anatomical concept-defines a tissue volume that contains a GTV and/or subclinical microscopic malignant disease, which has to be eliminated.|
|Planning target volume|
|Geometrical concept-selects appropriate beam sizes and arrangements, while taking into account all the possible geometrical variations and inaccuracies.|