Abstract: The invention relates to a collimator employed in X-ray equipment, which collimator comprises three or more perforated collimator plates. The purpose of the collimator is to prevent stray radiation, i.e. radiation scattered from the object under examination, from falling on the film. In a collimator according to the invention the collimator plates are arranged to form two groups. At least one collimator plate is located between the X-ray radiation source and the object under examination, and two or more collimator plates are located between the object and the X-ray film cassette. The holes of the collimator plates are superposed when seen from the focal point of the radiation source. The plate located nearest to the X-ray film casette is longer than the rest. It prevents stray radiation from falling on the film in the X-ray film cassette, when the collimator is moved between its extreme positions during the photography operation.

Abstract: An X-ray intensifying screen is disclosed which is made of material that transforms X-rays into light and a suitable binding agent, the screen comprising a screen member having a surface with a plurality of spaced recesses for channelling the light toward specific areas of the film and to prevent uncontrolled diffusion and scattering of the light generated by the X-rays.

Abstract: An absorption resolution testing device for use in connection with X-ray imaging devices, for example, computer tomography devices includes a vessel containing a liquid which has X-ray radiation absorption values approximately equal to living tissue and a plurality of smaller vessels disposed within the vessel and the liquid. A second liquid is disposed within the smaller vessels and has absorption values which are different from the absorption values of the first liquid in the vessel.

Abstract: An improved ionizing radiation detector functioning in a proportional chamber mode, for use with X-ray tomography systems, is disclosed. The detector includes an elongated housing enclosing a chamber, a high pressure gas of great atomic weight and substantially opaque to x-radiation in the chamber, anodes and cathodes mounted in the chamber enclosed in the gas, and a voltage supply for supplying a positive voltage to the anode and a negative voltage to the cathode. The housing includes a window substantially transparent to x-radiation. The cathodes are plate-type cathodes and the anodes are composed of a plurality of metal wires extending parallel to the beam direction of the radiation to be detected at spaced intervals within a substantially claim, and the anodes and cathodes are parallel to each other. Means are provided to separately detect the voltage pulse on each anode wire.