Brief description of the automatic centering of an object to be examined in a ct a beam fan and ct adapted to this

摘要

P tomodensitometer forming the image of a section of an object by using the results of a calculation by computer of the signals emitted by a line of detectors arranged in the range in front of a source of x-rays. in the centering a program is sent to the computer so that it generates the direction and the length of which it is necessary to move the object to be examined so that it is located inside the measurement field. In order to reduce or cancel the radiation dose received during the course of a centering, a screen placed between the source and the body to be examined is covered by the rays, except those which have to strike the detectors. / p & & p & application to the x-ray fan-beam tomodensitometers of general use. / p