In other words, to obtain a precise statement about the inner and outer geometry of an object to be inspected it is necessary to make X-rays from as many angles as possible. In the case of CT units, the X-ray tubes, the detector and the manipulator are therefore arranged in such a way that X-rays are possible from all directions, 360° at best. On the basis of the X-rays taken at various angles, a cross-sectional
image - the so-called tomogram (reconstruction) - is calculated
later on via a mathematical procedure. |
  Fig. Tomogram |
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