2016_Imaging for Physicists

Gradient-based auto-segmentation

2. Gradient-based segmentation  Derive a gradient-intensity image:

Plains & Plateaus → Mountain chains & Valleys  Crest detection by applying Watershed Transformation  Cluster analysis

PET image

Line profile

Image gradient

signal intensity

position

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ESTRO Teaching Course Advanced Imaging: PET – Reconstruction, Contouring