Abstract: In an X-ray apparatus utilizing a fan-shaped X-ray beam the thickness of the beam is determined by a collimator of variable aperture. The X-ray beam irradiates a patient to be examined and is subsequently detected by a detector array. An image of a patient can be formed from detector signals. Using a variable aperture of the collimator, comprising two slats which are pivotable in opposite directions and a collimating side of which is provided with an X-ray absorbing material, the thickness of the X-ray beam can be varied, and hence also the thickness of the slice to be imaged.

Abstract: An integrated radiation detector comprises a number of electrode plates assembled at a mutual distance. The electrode plates comprise slots in which electrically insulating gas-tight strips projecting through all the electrode plates are provided, of which strips one serves as an input window and the remaining strips serve as walls of the detection spaces. For sealing, the strips are interconnected, for example, by means of electrically insulated glued joints. Since the detector need no longer be assembled in a gas-tight housing, connections for the electrodes can be realized in a simple manner. Parts of the electrodes projecting beyond the actual detection space on the side of the input window may serve a collimator for the incident radiation.

Abstract: In devices having several electrical connections passing through a separation wall, feedthrough is realized by means of a flexible printed tape. The printed tape includes a number of electrical conductors, and is enveloped by a polyimide carrier which constitutes with an epoxy glue a very reliable permanent seal in separation walls of both metal and ceramic materials.

Abstract: A radiation detector is assembled using spacers which contact one another through apertures in the electrode plates of the detector, so that the relevant thickness dimension of the dimensionally accurate spacers determines the spacing of the plates. Thickness variations of the plates can be compensated for at a supporting surface of the spacers being provided with depressable raised portions. The plates may be constructed as laminations for collimator beyond which a radiation-sensitive element is arranged, and can also form electrode plates for a gas ionization detector.