790 / 1311
•
10 GEJ ca undergoing RT
•
6 Radiation Oncologists
•
CT alone vs PET-CT (manual)
•
Median observer overlap
analysis
(bars = Observer Agreement
Index)
•
Plans using PET-CT
reduced
both interobserver and
intraobserver variability
GTV delineation: PET & variability
Vesprini D. et al – Radiother Oncol. – 2010
Inter-observer variability
Intra-observer variability
PET-CT vs CT: 72.7% vs 69.1%
PET-CT vs CT: 78.7% vs 76.1%