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The voxel or sample size is the size of each voxel inside a 3D digital image, the physical dimensions of what is registered inside a VoXel . It can be understood also as the Sampling Distance , and is the inverse of the → Sampling Density .

The word "sample" does not refer, in this image processing context, to the object you are imaging, but to a VoXel !!!

The Ideal Sampling is determined by the Nyquist Rate .

See Sampling Density for more information.