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High Quality Content by WIKIPEDIA articles! The mathematical basis for tomographic imaging was laid down by Johann Radon. It is applied in Computed tomography to obtain cross-sectional images of patients. This article applies in general to tomographic reconstruction for all kinds of tomography, but some of the terms and physical descriptions refer directly to X-ray computed tomography. Figure 1: Parallel beam geometry. Each projection is made up of the set of line integrals through the object. The projection of an object at a given angle is made up of a set of line integrals. In X-ray CT, the line integral represents the total attenuation of the beam of x-rays as it travels in a straight line through the object. As mentioned above, the resulting image is a 2D (or 3D) model of the attenuation coefficient. That is, we wish to find the image (x,y). The simplest and easiest way to visualise method of scanning is the system of parallel projection, as used in the first scanners.