This extrusion is essentially how the 3D structure surface is created. It is shown here with just the center plane slabbed, clearly extending into the volume between planes.  This is very different from the 2D situation. In 2D, the contours completely defined the structure, and did so exactly. In 3D, the structure is assumed to extend beyond those contours in the Z dimension.  In the same manner, the dose pixels now become dose voxels.

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