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Auto-contouring algorithms improve consistency
• Source to Background ratio (SBR) determines a threshold level,
determined from phantom experiments (FDG-filled spheres in
background)
• 5 observers delineated the tumor manualy (a) and edited an SBR-
based contour if they deemed necessary (b)
• The SBR-based and edited contours show much less variability
Baardwijk et al. 2007; Int J Radiat Oncol Biol
Phys. 68:771-778