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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