Abstract: A method is for calibration of a transformation of at least two X-ray attenuation values (which are determined using different X-ray spectra) for a material, to a value for the density and a value for the atomic number of the material. A first distribution is recorded of first X-ray attenuation values obtained from a calibration phantom using a first X-ray spectrum, and a second distribution is recorded of second X-ray attenuation values obtained from the calibration phantom using a second X-ray spectrum. The recorded X-ray attenuation values are used to produce a density function and to produce an atomic number function. A value for the density and for the atomic number of the calibration sample is determined with the aid of the density function and the atomic number function, and a discrepancy between the determined values and the actual density and atomic number of the calibration sample is found.

Abstract: An image detector is for detecting electromagnetic radiation, in particular X-ray radiation. It includes a carrier layer and a photosensor carried by the carrier layer. Each of the carrier layer and photosensor both have a nonvanishing transparency to the electromagnetic radiation. The image detector includes two or more carrier layers and photosensors carried thereby, arranged one above the other, so that the electromagnetic radiation can pass through them one after the other.

Abstract: An X-ray detector is for a CT device and includes a phosphor layer for generating electromagnetic radiation as a function of the occurrence of X-radiation, and a photodetector layer for detecting the electromagnetic radiation generated by the phosphor layer. The phosphor layer includes ceramic material and the photodetector layer includes organic material. A process is further for producing an X-ray detector, including the steps of producing a phosphor layer from a ceramic material and applying a photodetector layer made from an organic material to the phosphor layer via a spinning, printing or beam/jet process or by sticking it on as a film. It is optionally possible to provide a further process step for polishing the surface of the phosphor layer before applying the photodetector layer.

Abstract: An image detector for an x-ray device includes photosensors which have at least two contacts on which an electrical signal occurs when x-rays are detected. In each case, at least one contact of the photosensors is arranged on its rear side, facing away from the image source. Further, the material used for the photosensors is an organic photodiode material.

Abstract: A current-limiting device contains at least one conductor track including high Tc superconductor material, on a support body. The conductor track is provided with a cover layer including an insulating plastic material, which includes a filler which increases the thermal conductivity. The thickness of the cover layer is greater than the thickness of the conductor track.

Abstract: A current limiting device includes a substrate or carrier body at least partially formed of electrically insulating material. At least one printed conductor configuration formed of high Tc superconductive material is disposed on the substrate or carrier body and has end pieces for establishing contact. The printed conductor configuration has a number of partial conductors which are connected in parallel between their end pieces and have at least approximately the same conductor length. A method for producing the device includes forming the printed conductor configuration by structuring a corresponding layer.

Abstract: The resistive current limiter contains an electrically insulating support body and at least one conductor track structure arranged thereon and having a conductor track made of high-Tc superconductor material. The conductor track has straight and curved conductor track segments. A maximum radii ratio v of 7 (v=ra/ri where ra=external radius, ri=internal radius) is to be maintained for the curved conductor track segments. The conductor track is advantageously patterned from a layer which is made of the high-Tc superconductor material and is applied on the support body.