Abstract: An X-ray detector (1) includes a light detection arrangement (3) such as a CMOS photodetector, a scintillator layer (5) such as a CsI:Tl layer, a reflector layer (9) and a light emission layer (7) interposed between the scintillator layer (5) and the reflector layer (9). The light emission layer (7) may include an OLED and may have a thickness of less than 50 ?m. Thereby, a sensitivity and resolution of the X-ray detector may be improved.

Abstract: A detector tile and a detector panel arrangement for providing a seamless detector surface with a continuous pixel array and with a reduced gap appearance includes a detector tile having a flat primary substrate and a surface layer with a circuitry arrangement. The surface layer is arranged on a front side of the primary substrate covering the primary substrate. The circuitry arrangement includes detector pixels providing a pixel array, where a connection opening is provided in the surface layer and the flat primary substrate at least at one edge of the detector tile. The connection opening is leading from the surface layer to the rear of the substrate for guiding electrical connection elements between the front side and a rear of the detector tiles. The connection openings on opposing edges of the detector tile alternate, and the connection openings on adjacent edges of detector tiles alternate.

Abstract: According to an embodiment of the invention, signals coming from a number of pixels or sub-pixels are compared and those signals from pixels or sub-pixels, which are substantially brighter than the other pixels in the comparison, are excluded from contributing to the output signal, to suppress direct detection events in X-ray detectors. For this an X-ray detector apparatus (101) can comprise: —an array (102) of pixel arrangements (303), —each pixel arrangement (303) comprising at least one radiation collection device (311) for converting incident radiation into a collection device signal, —switching arrangements (313, 324, 314, 142; 313, 315, 314, 352, 142; 313, 315, 314; 361) for providing to respectively one output element (141) a signal derived from the collection device signals of a plurality of radiation collection devices (311) of at least one pixel arrangement (303).

Abstract: The present invention relates to a detector tile, a detector panel arrangement, an X-ray detector, an X-ray imaging system, and a method for providing a detector tile for a seamless detector surface with a continuous pixel array. In order to build a large area detector with reduced gap appearance, a detector tile (30) is provided having a flat primary substrate (32) and a surface layer (34) with a circuitry arrangement (36). The surface layer is arranged on a front side (38) of the primary substrate covering the primary substrate. The circuitry arrangement comprises a number of detector pixels (40) providing a pixel array (42), wherein at least one connection opening (44) is provided in the surface layer and the flat primary substrate at least at one edge of the detector tile, which connection opening is leading from the surface layer to the rear of the substrate for guiding electrical connection elements between the front side and the rear of the detector tiles.

Abstract: A tiled detector assembly (1000) and a method for making a tiled radiation detector (1000) is described. The innovative feature of this method is that the xyz misalignment of the detector tiles (304, 304?), the origin of various image artifacts, can be significantly reduced by accurate sizing and alignment of the detector tiles (304, 304?). Consequently, image quality, yield and reliability of as-produced tiled radiation detectors are considerably improved.

Abstract: An x-ray detector and its pixel circuit are described, that allow to cover a large dynamic range with automatic selection of the sensitivity setting in each pixel, thus providing improved signal to noise ratio with all exposure levels. X-ray detectors are required to cover a large dynamic range. The largest exposure determines the required pixel capacitance. However, a large pixel capacitance gives a bad signal to noise ratio with small exposures e.g. in the dark parts of the image. This invention disclosure describes several approaches to provide automatic sensitivity selection in the pixels. This ensures that low signals are stored in a small capacitor or read out with a high sensitivity with corresponding good signal to noise ratio, while larger signals are stored in larger capacitors or are read out with lower sensitivity so that no information is lost.

Abstract: An X-raydetector (1) is proposed comprising a light detection arrangement (3) such as a CMOS photodetector, a scintillator layer (5) such as a CsI:T1 layer, a reflector layer (9) and a light emission layer (7) interposed between the scintillator layer (5) and the reflector layer (9). The light emission layer (7) may comprise an OLED and may be made with a thickness of less than 50 ?m. Thereby, a sensitivity and resolution of the X-raydetector may be improved.

Abstract: The present invention generally refers to computed tomography (CT) based imaging systems and, more particularly, to a fast 3D tomosynthesis scanner apparatus and CT-based method without focal spot motion during continuous tube movement around an object of interest (O) or tissue region (M) to be examined (herein also referred to as “object”), which may advantageously be used in cone-beam volume CT mammography imaging so as to avoid motion artifacts and blurring effects.

Abstract: A tiled detector assembly (1000) and a method for making a tiled radiation detector (1000) is described. The innovative feature of this method is that the xyz misalignment of the detector tiles (304, 304?), the origin of various image artifacts, can be significantly reduced by accurate sizing and alignment of the detector tiles (304, 304?). Consequently, image quality, yield and reliability of as-produced tiled radiation detectors are considerably improved.

Abstract: An x-ray detector and its pixel circuit are described, that allow to cover a large dynamic range with automatic selection of the sensitivity setting in each pixel, thus providing improved signal to noise ratio with all exposure levels. X-ray detectors are required to cover a large dynamic range. The largest exposure determines the required pixel capacitance. However, a large pixel capacitance gives a bad signal to noise ratio with small exposures e.g. in the dark parts of the image. This invention disclosure describes several approaches to provide automatic sensitivity selection in the pixels. This ensures that low signals are stored in a small capacitor or read out with a high sensitivity with corresponding good signal to noise ratio, while larger signals are stored in larger capacitors or are read out with lower sensitivity so that no information is lost.

Abstract: The present invention generally refers to computed tomography (CT) based imaging systems and, more particularly, to a fast 3D tomosynthesis scanner apparatus and CT-based method without focal spot motion during continuous tube movement around an object of interest (O) or tissue region (M) to be examined (herein also referred to as “object”), which may advantageously be used in cone-beam volume CT mammography imaging so as to avoid motion artifacts and blurring effects. According to the present invention, said 3D tomosynthesis scanner apparatus is adapted to perform a rotational step-and-shoot image acquisition procedure for acquiring a set of 2D projection images during a continuous rotational movement of an X-ray tube (101) in an azi-muthal direction (+?) along an arc segment of a circular trajectory when rotating around said object (O, M) and subjecting these 2D projection images to a 3D reconstruction procedure.

Abstract: According to an embodiment of the invention, signals coming from a number of pixels or sub-pixels are compared and those signals from pixels or sub-pixels, which are substantially brighter than the other pixels in the comparison, are excluded from contributing to the output signal, to suppress direct detection events in X-ray detectors. For this an X-ray detector apparatus (101) can comprise: —an array (102) of pixel arrangements (303), —each pixel arrangement (303) comprising at least one radiation collection device (311) for converting incident radiation into a collection device signal, —switching arrangements (313, 324, 314, 142; 313, 315, 314, 352, 142; 313, 315, 314; 361) for providing to respectively one output element (141) a signal derived from the collection device signals of a plurality of radiation collection devices (311) of at least one pixel arrangement (303).

Abstract: The invention relates to a radiation detector (3) comprising a detector array (5) having a periodical pattern of detector elements (51). Each detector element (51) comprises a sensor element (53) for converting incident radiation into an electrical charge. The sensor elements (53) are spaced at a sensor-center-to-center distance. Over the detector array (5) an imaging radiation-collimating structure (7) is disposed. The imaging radiation-collimating structure has a periodical pattern of radiation absorbing elements, which radiation absorbing elements are being spaced at a collimator center-to-center distance. The radiation detector (3) comprises a combiner for generating combiner-signals from the electrical charges of the sensor elements (53) of groups of an even number of sensor elements adjacent in a direction of the periodicity of the pattern of the radiation absorbing elements.

Abstract: Detector with a partially transparent scintillator substrate According to an exemplary embodiment of the present invention, a flat detector is provided in which an opaque layer between a transparent substrate and a CsI scintillator is arranged. This layer is made partially transparent by opening many small holes in the opaque layer with for example a pulsed laser. This allows for the application of light to the inside of the front end of the flat detector through the opaque layer.

Abstract: An Y-ray detector apparatus comprises an array of detector pixels arranged into a plurality of sub-arrays. The pixels in each sub-array share a common dose sensing output provided to a dose sensing output conductor which extends to a periphery of the pixel array. The dose sensing output conductor for one sub-array of pixels passes through the area occupied by another sub-array of pixels, which can lead to unwanted cross talk. The invention provides a plurality of additional screening electrodes, with a screening electrode substantially adjacent the dose sensing output conductor for each sub-array of pixels. These screening electrodes reduce cross talk between the dose sensing output and other pixel electrodes. In another arrangement, each pixel further comprises a pixel electrode for each pixel formed at an upper region of the array, and the dose sensing output conductors are formed at a lower region of the array.

Abstract: The present invention relates to an X-ray imaging apparatus and a corresponding X-ray imaging method, in particular for X-ray fluoroscopy and for an application where a characteristic feature shall be extracted from acquired X-ray images.

Abstract: A radiation detector comprises an electrode structure, a planarising layer being disposed over the electrode structure and a protective stack which covers the planarising layer. The planarising layer evens out substantial differences between levels of the electrode structure above the substrate on which the electrode structure is disposed. Consequently, cracks, weak spots and other defects in the protective stack are to a large extent avoided. Because the planarising layer covers essentially the entire electrode structure, practically all sources of defects, notably cracks, in the protective stack are avoided.

Abstract: An Y-ray detector apparatus comprises an array of detector pixels arranged into a plurality of sub-arrays. The pixels in each sub-array share a common dose sensing output provided to a dose sensing output conductor which extends to a periphery of the pixel array. The dose sensing output conductor for one sub-array of pixels passes through the area occupied by another sub-array of pixels, which can lead to unwanted cross talk. The invention provides a plurality of additional screening electrodes, with a screening electrode substantially adjacent the dose sensing output conductor for each sub-array of pixels. These screening electrodes reduce cross talk between the dose sensing output and other pixel electrodes. In another arrangement, each pixel further comprises a pixel electrode for each pixel formed at an upper region of the array, and the dose sensing output conductors are formed at a lower regon of the array.

Abstract: A radiation detector comprises an electrode structure, a planarising layer being disposed over the electrode structure and a protective stack which covers the planarising layer. The planarising layer evens out substantial differences between levels of the electrode structure above the substrate on which the electrode structure is disposed. Consequently, cracks, weak spots and other defects in the protective stack are to a large extent avoided. Because the planarising layer covers essentially the entire electrode structure, practically all sources of defects, notably cracks, in the protective stack are avoided.

Abstract: In the manufacturing process of color display tubes with a dotted screen pattern, to form the screen (11), a segmented lens (3) is used for exposing the display window (4) in order to apply a structure of a black matrix layer and a layer with electroluminescent material to it. Principally, a segmented lens (3) gives rise to a phenomenon that is called facet marking; this is a result of the fact that the images of consecutive facets (12) of the lens on the screen (11) are disjunct or partly overlap, giving dark lines (42) or bright lines (44). In present day color display tubes—especially for use as computer monitors—it is getting more and more important to reduce facet marking as far as possible. It is proposed to manufacture the segmented lens (3) according to a new process in which the mold (30) for the manufacture of said segmented lens is significantly changed.