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Texture analysis in a 60-year-old male with high-grade, muscle invasive urothelial cancer (same patient as in Figure 2). (A) Placement of a free-hand polygonal 2D ROI (outlined in blue colour) on the axial DWI b1500 slice containing the maximum viable component of the tumor, avoiding the peripheral 1–2 mm. (B, C and D) Display of the filtered images at spatial scale factors of 2 mm, 4 mm and 6 mm, respectively. DWI, diffusion-weighted imaging; ROI, region of interest
