Advanced Skills in Modern Radiotherapy 2018

ICRU Guidelines (ICRU50): volume definition • Volumes defined prior/ during treatment planning: ➢ Gross Tumor Volume (GTV) ➢ Clinical Target Volume (CTV) ➢ Planning Target Volume (PTV)

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Organs At Risk (OAR)

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Treated Volume

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Irradiated Volume

• Volumes might be redefined during treatment for adaptive RT