Table 1
Definition of volumes in radiotherapy.
| Gross tumour volume
(GTV) | The gross, palpable, or visible/clinically demonstrable location and extent of the malignant growth |
| Clinical target volume
(CTV) | Anatomical concept-defines a tissue volume that contains a GTV and/or subclinical microscopic malignant disease, which has to be eliminated. |
| Planning target volume
(PTV) | Geometrical concept-selects appropriate beam sizes and arrangements, while taking into account all the possible geometrical variations and inaccuracies. |
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