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Figure 8. Volume rendering 3D images with two different transfer functions. (a) A linear ramp transfer function giving high opacity (up to 50%) to all voxels inside the bile duct. (b) Rendered with lower opacity (12%) and a transfer function emphasising attenuation values in a narrow intermediate interval, corresponding to the border between the bile duct lumen and surrounding tissue. A surgically verified stone is observed in the distal bile duct.

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