Journal article

Lung organ-at-risk volumes: A survey of practice and the need for a consistent definition in the 4DCT era

Shalini Vinod, Callie Choong, Philip Vial, Tomas Kron, David Ball

JOURNAL OF MEDICAL IMAGING AND RADIATION ONCOLOGY | WILEY | Published : 2019

Abstract

INTRODUCTION: In the 4DCT era, the definition of lung organ-at-risk (OAR) volumes for dose-volume histogram (DVH) calculation is unclear, introducing potential for variability in practice. We aimed to identify definitions used clinically and evaluate the magnitude of DVH differences between these. METHODS: We surveyed Australian & New Zealand departments about lung radiotherapy protocols including lung OAR volume definition. We used these definitions to calculate lung DVHs on 10 patients prescribed lung IMRT (60-66 Gy/30-33 fractions). We calculated mean lung dose (MLD), V20 and V30 for 'Lungs - PTV', 'Lungs - CTV', 'Lungs - iGTV' (internal GTV in all respiratory phases) and 'Lungs - GTV_EX'..

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