In 1963 and 1964 Allan Cormack published the theoretical foundations of computer tomography in the Journal of Applied Physics. In 1972 the first computed tomographic scanner was built by Godfrey Hounsfield who, together with Allan Cormack, was awarded the Nobel Prize in Physiology or Medicine in 1979. The basic idea of computerised tomography is the illumination of an object by x-rays from numerous different angles.

Our educational x-ray apparatus ( preferred with W tube) allows the illumination of objects by x-rays. The resulting 2D-projections are visualised at the fluorescence screen. These projections have a relatively low intensity. Therefore a camera of high sensitivity has to be used to record the various projections. Such a camera is implemented in the computed tomography module.

By turning an object using the built-in goniometer of the x-ray apparatus, and recording the 2D-projections from each angular step, the computer can reconstruct the object illuminated by x-rays. Our e-learning software visualises the back projection ( necessary for reconstructing the computed tomogram) concurrently with the scanning process. The 3D-model is then displayed on the PC screen.

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