Difference between a pixel and a voxel

What is the difference between a pixel and a voxel?

A pixel, or picture element, is the smallest element of a 2D digital image that can be individually processed, whereas a voxel, or volume element, is the smallest element of a 3D digital image that can be individually processed. A voxel that is the same length in all three dimensions is called an isotropic voxel.

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