Abstract: An X-ray image converter (2) for recording and evaluating information gained from X-ray investigations of persons (3), animals or objects is suggested, which comprises a carrier (4) of a material in which the impinging X-ray radiation causes detectable changes, as well as a method for recording X-ray images, wherein changes in charge carriers on the surface of a carrier (4) are determined for evaluation of the radiation from the object (3) being observed.

Abstract: An apparatus, including a photoconductor (1) for converting X-rays into a charge pattern, and a controllable charging device (3, 9) for charging the surface of the photoconductor to a defined potential. The service life of the charging device is prolonged in that there is provided a measuring device for measuring the potential on the surface of the photoconductor and for controlling the charging device in dependence on the potential.

Abstract: A method of and device for forming X-ray images in which a charge pattern corresponding to the X-ray intensity generated on the surface of a photoconductor is line-wise scanned by a number of probes which detect the charge in respective adjoining scanning zones of the photoconductor containing a plurality of lines eliminates stripes occurring in the line direction in the image. This is accomplished by: a) formation of correction values (K.sub.n (x,y.sub.o)) for the pixels of the image line (y.sub.o) at the edges of the scanning zones of the probes (41), the absolute value and sign of the correction values being such that corrected image values (B.sub.kn (x,y.sub.o)) of the individual probes, resulting from the superposition of the correction values and image values (B.sub.n (x,y.sub.o)), correspond to the corrected image values of the respective neighboring probes; b) formation of intermediate values (Z.sub.

Abstract: An X-ray apparatus, includes a photoconductor for convening X-rays into a charge pattern and a corona charging device for charging the surface of the photoconductor to a defined potential prior to an X-ray exposure. Deposits of dust on the corona charging device, and the associated artefacts in the X-ray image, are avoided in that there is provided a control unit for operating the corona charging device in a charging mode and in a cleaning mode, a first voltage being applied to the corona charging device in the charging mode whereas in the cleaning mode a second voltage is applied thereto which has, at least temporarily, a polarity which opposes that of the first voltage.

Abstract: An imaging belt, a dielectric recording sheet, a charger, a transcript roller, and first and second rollers are arranged in a casing. A latent image corresponding to a radiation transmitted image is formed on the imaging belt. At least a fluorescent layer which is sensitive to a radiation to emit light, and a photosensitive layer sensitive to the light emitted by the fluorescent layer are formed on a flexible substrate to constitute the imaging belt. The imaging belt is looped around the first and second rollers, and is driven to rotate. The dielectric recording sheet is rolled, and the latent image formed on the photosensitive layer of the imaging belt is transcribed onto the dielectric recording sheet. The charger charges the surface of the imaging belt at a high voltage. The transcript roller urges the dielectric recording sheet against the imaging belt. Then, the latent image formed on the imaging belt is transcribed onto the dielectric recording sheet.

Abstract: The contrast of an electrographic image or a region of interest of an electrographic image having low contrast is enhanced by developing the electrographic image with toner using a development electrode which is biased to a potential which has a value near the average potential of the image but outside of the range of values of potential corresponding to image features selected for enhancement. The voltage potential of the electrographic image is measured to determine the average potential in the region of interest. The development electrode bias is set at a potential near the average potential but outside of the range of potentials corresponding to the image features selected for enhancement in the region of interest of the image. When developed with toner, the toner image has enhanced contrast. If the image is a xeroradiographic image, diagnostic capability of low contrast regions can be enhanced.

Abstract: An electrical image signal is produced by an electrographic process including the steps of forming a differential voltage pattern; developing the voltage pattern with a luminescent toner; exciting the developed image to emit radiation; and photoelectrically detecting the emitted radiation to produce an electrical image signal.

Abstract: A plurality of electrometer probes scan the charge pattern of a photoconductor (1), the distance between the electrometer probes (6) and the photoconductor (1) being measured via an alternating voltage applied to the photoconductor (1). The alternating voltage is scanned by the electrometer probes and is filtered out to extract distance measuring signals. The output signals of all electrometer probes (6) are used for determining image values of the X-ray image, the output signals of at least some of the electrometer probes (6) also being used, via a suitable filter (23), for determining the distance measuring signals. An adjusting device adjusts the distance between the electrometer probes (6) and the photoconductor (1) continuously to a reference value, in dependence on the value of the measuring signals, during the scanning operation.

Abstract: A photoconductor for converting incident X-ray radiation into a charge pattern is on carrier constructed so as to be rotationally symmetrical with respect to an axis of rotation. A driving unit rotates the carrier and photoconductor about the axis of rotation. A charge reading unit which, after exposure to X-rays forming an X-ray picture, converts the charge pattern on the surface of the rotating photoconductor into electric picture values. Reduced picture exposure time (with the time for reading the photoconductor remaining equally low) is achieved in that the converter does not rotate during exposure to the X-rays for taking an X-ray picture.

Abstract: The invention relates to a method of producing an X-ray exposure is provided by a photoconductor, which converts X-radiation into a charge pattern, is evenly charged locally before the X-ray exposure, is discharged by the exposure as a function of the intensity of the X-radiation and the surface of which is scanned after the exposure for detecting the charge density, an image value being formed for each image point, corresponding to the discharge at the image point. The measured image values may be falsified by the self-discharge of the photoconductor induced by X-radiation. Since the self-discharge always proceeds in accordance with the same time laws, the self-discharge effects are corrected utilizing the time of the scanning instants, i.e., position in time with respect to the X-ray exposure and the end of the charging of the photoconductor in conjunction with a characteristic discharge function of the photoconductor and a correction factor.

Abstract: A method is disclosed for producing a X-ray image by a photoconductor which converts X-rays into a charge pattern and which is uniformly charged prior to the X-ray exposure and is discharged during the X-ray exposure as a function of the intensity of the X-rays, the surface of the photoconductor being scanned to measure the charge density, for each pixel point there being formed an image value which is dependent on the discharge at the relevant pixel whereby dot-shaped artefacts in the X-ray image may appear.

Abstract: A method and apparatus for producing an X-ray exposure by means of a photoconductor. Photoconductor defect locations which appear as artefacts in the X-ray image are eliminated by subtracting a compensated dark discharge image from the X-ray image.

Abstract: An x-ray electro-photographic recording material is formed of a photo-conductive layer (1) comprised of a selenium-arsenic alloy and positioned on a transparent electrode layer (4), which is positioned on a further layer (3) comprised of an x-ray luminophore and positioned on a reflective surface (2a) of a film carrier layer (2). In usage, with a positive corona charge on the free photo-conductive layer surface (1a) before x-ray exposure, the luminophore-containing layer (3), during x-ray exposure, converts a component (5) of the x-ray radiation (.gamma.) not absorbed by the photo-conductive layer (1) into visible luminescent light (6) which effects an increase of sensitivity in the photo-conductive layer (1). This recording material can be used in x-ray photograph devices.

Abstract: A method of operating a photodetector system. The method impresses a surface charge on a photon detector by establishing an electric potential across the detector, storing the detector in the dark, disconnecting the source of electric potential, and electrically connecting layers in the detector.