The first scanner CAT by field (1972) was built. The first type of trading by EMI Ltd, England, were produced. With the progress of this system, improving the reconstruction image, the degree of dissociation, and (SNR) has been achieved.

the scanner the first generation of a tube, X-rays, ride on a scanning mechanism, electromechanical which is the output of it to form a beam narrow parallel. The patient lies on a table, the slider is placed so that the round Glide a cup of plastic used (to stabilize the location). The sidelines of the Cup, the plastic on a box, Cube, plastic, filled with water.(Water, UV, X the good pass gives)