The conventional X-ray technique provides summation images because of the 3-D object located between the X-ray source and the detector being reproduced two-dimensionally. This means that the structures, which in the radiation path are not positioned next to each other but one after the other, cannot be differentiated .

In contrast thereto the computerized tomography generates a cross-section image of the object under inspection free of superimposed structure. Thanks to the representation free of superimposed structure, areas or details ., which in case of conventional radioscopy are hidden behind object edges of complicated geometry or which are difficult to recognize, can be displayed without any problem. Beyond this, it is possible to display and measure position, shape, size and density distribution of internal details.