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Comparison of PET-derived ROIs in FDG-positive tumor and lymph node regions between images acquired with RT and diagnostic scan setup. Boxplots present results of four different similarity measures for all patient ROIs. A-D: Dice similarity index (DSI), relative volume difference (RVD), average symmetric surface distance (ASSD) and the distance of geometric centers (DOGC). E: ROIs in two lesions are shown exemplarily for one patient (#06) on a fused PET/MR image in axial view.
