A contraction for picture element, a two-dimensional representation of a volume element (voxel) in the display of the CT or MR image, usually 512 × 512 or 256 × 256 pixels, respectively.
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picture element
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n.
short for 'picture element', the smallest individual component of an electronically produced image. Numerical values are ascribed to each pixel, which describe its position and relative intensity and/or colour. A two-dimensional matrix of pixels produces the final image.
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pix·el (pikґsel) [contraction of pix (short for pictures) + element] a two-dimensional region defining a unit of area on a video display screen.Medical dictionary. 2011.