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What is a pixel, a voxel, a matrix?
"A CT image is composed of a square image matrix that ranges in size from 256 X 256 to 1024 X 1024 picture elements or pixels. Since a CT section has a finite thickness, each pixel actually represents a small volume element, or voxel. The size of this voxel depends on the matrix size, the selected field of view (FOV), and the section thickness." (Prokop and Galanski, 2003)
2003 Prokop, M., and M. Galanski. Spiral and Multislice Computed Tomography of the Body, A. J. van der Molen, and C. M. Schaefer-Prokop (eds.), Thieme, New York, pp. 1-1090.