Is half-invasive for the amount of radiation and for the frequent use of contrast media.
The beam of x-rays used is flat and wide as a sheet perpendicular to the long axis of the body, the three-dimensional image to be reconstructed by a computer corresponds to a cross-section body top few millimeters.
If you hit this picture, you can get a two-dimensional figure which is reproduced on a film, so the body can be analyzed, layer by layer, to that portion of its axis that contains the body structures that are to be analyzed.

The patient is lying on a bed that slides slowly inside a cylinder, here a collimated beam of x-ray fan, having passed through the body, is collected by special detectors that convert it into a signal which in turn will elettricoanalogico digitized by a converter, a computer will turn everything into images.

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