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Palliative radiation therapy for the head/neck region

Definitions

Target volume

 

Definitions of target volumes according to ICRU (International Commission on Radiation Units and Measurements)
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 encompassing the CTV and IM. (ITV = CTV + IM)
PTV (Planning Target Volume) Geometrical concept. Defined to select appropriate beam sizes and beam arrangements, taking into consideration the net effect of all the possible geometrical variations and inaccuracies in order to ensure that the prescribed dose is actually absorbed in the CTV. Its size and shape depend on the CTV but also on the treatment technique used, to compensate for the effects of organ and patient movement, and inaccuracies in beam and patient setup.
OAR (Organ at Risk) Normal tissues whose radiation sensitivity may significantly influence treatment planning and/or prescribed dose.
PRV (Planning Organ at Risk Volume) Includes margin around the OAR to compensate for changes in shape and internal movement and for set-up variation.
TV (Treated Volume) Volume enclosed by an isodose surface.
IV (Irradiated Volume) The volume that receives a dose that is significant in relation to normal tissue tolerance.
CI (Conformity Index) Relationship between TV and PTV (TV/PTV).

 

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