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Radiation treatment for locoregional recurrence and distant metastases from malignant melanoma

Definitions

Target volume

 

 

Target volume definitions from ICRU
(International Commission on Radiation Units and Measurements)

GTV (= Gross Tumor Volume)

Tumor volume

Palpable or visible/identifiable area of malignant growth.

CTV (= Clinical Target Volume)

Clinical target volume

Tissue volume which contains GTV and/or subclinical microscopic malignant disease.

ITV (= Internal Target Volume)

Target volume

Volume containing CTV and one inner margin taking into account inner movements and revisions of CTV. 

PTV (= Planning Target Volume)

Planning volume

Geometric volume containing ITV and one set-up margin taking into account variation in patient movement, patient positioning, and field modeling.

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