FUNCTIONAL PRINCIPLE OF COMPUTED TOMOGRAPHY
Computed Tomography makes it possible to create cross-sectional images
of three-dimensional objects using X-rays. In conventional radiography,
the three-dimensional object situated between the X-ray source and
detector is reproduced in the X-ray image on a two-dimensional surface.
The overlapping which occurs thereby means that the position of structures
can be differentiated only when they lie next to each other in the
direction of the X-ray beam, and not behind one another. This, in
turn, means that information about the spatial arrangement and expansion
of structures in the item to be inspected can only be gained to a
limited extent from one single X-ray image.
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