Editing Sampling (signal processing) (section)

=== 3D sampling ===
The process of [[volume rendering]] samples a 3D grid of [[voxel]]s to produce 3D renderings of sliced (tomographic) data. The 3D grid is assumed to represent a continuous region of 3D space. Volume rendering is common in medical imaging, [[X-ray computed tomography]] (CT/CAT), [[magnetic resonance imaging]] (MRI), [[positron emission tomography]] (PET) are some examples. It is also used for [[seismic tomography]] and other applications.

[[File:Bandpass sampling depiction.svg|thumb|right|255px|The top two graphs depict Fourier transforms of two different functions that produce the same results when sampled at a particular rate. The baseband function is sampled faster than its Nyquist rate, and the bandpass function is undersampled, effectively converting it to baseband. The lower graphs indicate how identical spectral results are created by the aliases of the sampling process.]]