Abstract: A high speed multiple section, computed-tomographic X-ray scanner includes a plurality of radiation detectors arranged in two rings. Each detector comprises an elongated scintillator crystal, a small area photodiode positioned at one end of the crystal, and a light reflector positioned at the opposite end of the crystal with the crystal functioning as a light pipe in directing light to the photodiode. An active low pass filter is employed as a preamplifier for current from each photodiode.

Abstract: Disclosed is a target structure for use in an X-ray transmission scanner in which X-rays are generated by directing an electron beam at an X-ray generating target. The structure includes a support bracket having a recessed portion and a support surface formed in the recessed portion. A bolt extends through the bracket and maintains a target member in abuttment with the support surface which positions the target in proper alignment with an electron beam.

Abstract: An electron beam production and control assembly especially suitable for use in producing X-rays in a computed tomography (CT) X-ray scanning system is disclosed herein along with its method of operation. This assembly produces its electron beam within a vacuum-sealed housing chamber which is evacuated of internal gases, except inevitably for small amounts of residual gas. The electron beam is produced by suitable means within the chamber and directed along a path therethrough from the chamber's rearwardmost end to its forwardmost end whereby to impinge on a suitable target for producing the necessary X-rays. Since there is residual gas within the chamber, the electrons of the beam will interact with it and thereby produce positive ions which have the effect of neutralizing the space charge of the electron beam.

Abstract: An electron beam production and control assembly especially suitable for use in producing X-rays in a computed tomography X-ray scanning system is disclosed herein. In this system, an electron beam is ultimately directed onto an X-ray producing target in a converging manner using electromagnetic components to accomplish this. The system also includes an arrangement for neutralizing the converging beam in a controlled manner sufficient to cause it to converge to a greater extent than it otherwise would in the absence of controlled neutralization, whereby to provide ion aided focusing.