Improving Observer Variability in Target Delineation for Gastro-oesophageal Cancer-the Role of 18Ffluoro-2-deoxy-d-glucose Positron Emission Tomography/Computed Tomography

The addition of FDG-PET to computed tomography-based planning for the identification of primary tumour GTV in patients with gastro-oesophageal carcinoma decreases both inter-observer and intra-observer variability.