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Tomography is imaging by sections or sectioning. A device used in tomography is called a tomograph, while the image produced is a tomogram. The method is used in medicine, archaeology, biology, geophysics, materials science and other sciences. In most cases it is based on the mathematical procedure called tomographic reconstruction. There are many different types of tomography, as listed: (Note that the Greek word tomos conveys the meaning of "a section" or "a cutting"). A tomography of several sections of the body is known as a polytomography.