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Modern RT planning in lymphoma incorporates the current concepts of

volume determination as outlined by ICRU Report 83

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It is based on defining a gross tumor volume (GTV) and a clinical target

volume (CTV), that is expanded to a planning target volume (PTV)

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The PTV is then used to define beam coverage

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This approach allows direct comparison with the diagnostic 3D-imaging,

increasing the accuracy with which lymph node volumes are defined

Treatment Volume Principles