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.