A Detector which is non-divisable and of finite size.

A detector pixel is typically; but not necessarily a physical element of a detector consisting of multiple, repetitively arranged detector pixels.

Event based detectors may be interpreted as one-pixel detectors, even if further analysis of their output signal allows further spatial separation of registered signals leading to electronic pixels in their output.

Note that SEM techniques often use one-pixel detectors.

Note that in Electron Backscatter Diffraction (EBSD), which uses two-dimensional detectors, it is common to group N x N neighboring pixels into "superpixels" (in a process called binning) to reduce data size or to improve signal-to-noise ratio.

Semiconductor detectors for backscattered or transmitted electrons are sometimes segmented to achieve certain contrasts. While these segments fall under the definition of detector pixel given here, they are usually not treated as such because they are essentially operated like single pixel detectors.