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Palliative Radiation Treatment of Breast Cancer

Definitions

Target Volume

 

 

Target volume definitions in accordance with ICRU
(International Commission on Radiation Units and Measurements)
GTV (=Gross Tumor Volume)

Palpable or visible/identifiable spread of malignant growth.

CTV (=Clinical Target Volume)

Tissue volume containing GTV and subclinical microscopic malignant disease.

ITV (=Internal Target Volume)

Volume containing CTV and an internal margin taking into account internal movements and changes in  CTV.  This is the volume that should receive an optimal dose.

PTV (=Planning Target Volume) Geometric volume containing ITV and one set-up margin taking into account patient movement, patient positioning, and field modeling.

 

 

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