Abstract: Systems and methods are provided for generating X-ray pulses during X-ray imaging. A high voltage of an X-ray tube is automatically switched off. The tube voltage decays and upon reaching a predefined threshold value of the tube voltage or a predefined waiting time after switching off the high voltage, a grating voltage of a grating arranged between an emitter and an anode of the X-ray tube is automatically switched on. No electrons reach the anode from the emitter, and the tube current drops to the value zero.

Abstract: A method for correction of an x-ray image recorded with an x-ray device with an anti-scatter grid for effects of the anti-scatter grid is provided. The anti-scatter grid has a spatially periodically repeating geometrical embodiment, and a calibration image recorded without an imaging object is used. The calibration image and the x-ray image are transformed by a transformation into the position frequency space. In the position frequency space, adaptation parameters describing changes of the calibration image optimizing a measure of matching between the x-ray image and the calibration image are established. For correction, the adapted calibration image is subtracted from the x-ray image, and the x-ray image is transformed back into the position space again using an inverse of the transformation.

Abstract: A method is provided for determining a navigation image displaying features of a region of interest of a patient, (e.g., used during a medical intervention). The method includes determining a first subtraction image by recording a first X-ray image with an X-ray device and subtracting a mask image. The method also includes determining a second subtraction image by recording a second X-ray image with the X-ray device and by subtracting the mask image or a further mask image. Additionally, the navigation image is determined by superimposing the first and the second subtraction image. At least one of the subtraction images is preprocessed before the superimposition by transfer from a gray-value space into a color space that is different from a color space of the other subtraction image. The navigation image is determined in color and/or the dynamics of at least one of the subtraction images are compressed.

Abstract: A method and apparatus for determining an x-ray image data record of a target location subjected to a movement using an x-ray device. A number of basic images of the target location are recorded using a basic exposure time in each case and the x-ray image data record corresponding to an x-ray image with a longer exposure time is determined by combining basic images registered with one another. At least one quality value assigned hereto and relating to the movement in the target location during the recording is determined for each basic image and the contribution of a basic image to the x-ray image data record is determined as a function of the quality value.

Abstract: An X-ray projection of a region of examination and an associated X-ray parameter are received via an interface, the X-ray projection including X-ray intensities in a first pixel set. The X-ray parameter relates to at least one X-ray voltage from an X-ray source. Scattered radiation intensity is determined in a second pixel set, the second pixel set being a subset of the first pixel set. A first calculation of first exposure parameters in the second pixel set then occurs, each of the first exposure parameters in a pixel of the second pixel set being based on the X-ray intensity in the pixel and the scattered radiation intensity in the pixel. Furthermore, a second calculation of a scalar second exposure parameter occurs based on the first exposure parameters and an adjustment of the X-ray parameter is performed by comparing the scalar second exposure parameter with a reference value.

Abstract: An X-ray projection of a region of examination and an associated X-ray parameter are received via an interface, the X-ray projection including X-ray intensities in a first pixel set. The X-ray parameter relates to at least one X-ray voltage from an X-ray source. Scattered radiation intensity is determined in a second pixel set, the second pixel set being a subset of the first pixel set. A first calculation of first exposure parameters in the second pixel set then occurs, each of the first exposure parameters in a pixel of the second pixel set being based on the X-ray intensity in the pixel and the scattered radiation intensity in the pixel. Furthermore, a second calculation of a scalar second exposure parameter occurs based on the first exposure parameters and an adjustment of the X-ray parameter is performed by comparing the scalar second exposure parameter with a reference value.

Abstract: An X-ray projection of a region of examination and an associated X-ray parameter are received via an interface, the X-ray projection including X-ray intensities in a first pixel set. The X-ray parameter relates to at least one X-ray voltage from an X-ray source. Scattered radiation intensity is determined in a second pixel set, the second pixel set being a subset of the first pixel set. A first calculation of first exposure parameters in the second pixel set then occurs, each of the first exposure parameters in a pixel of the second pixel set being based on the X-ray intensity in the pixel and the scattered radiation intensity in the pixel. Furthermore, a second calculation of a scalar second exposure parameter occurs based on the first exposure parameters and an adjustment of the X-ray parameter is performed by comparing the scalar second exposure parameter with a reference value.

Abstract: Systems and methods are provided for generating X-ray pulses during X-ray imaging. A high voltage of an X-ray tube is automatically switched off. The tube voltage decays and upon reaching a predefined threshold value of the tube voltage or a predefined waiting time after switching off the high voltage, a grating voltage of a grating arranged between an emitter and an anode of the X-ray tube is automatically switched on. No electrons reach the anode from the emitter, and the tube current drops to the value zero.

Abstract: A medical instrument is provided for use with a phase contrast imaging. The medical instrument includes at least one component, which has a strong small angle scattering of x-rays. Furthermore, a corresponding x-ray recording system with phase contrast imaging for recording an examination object may include such a medical instrument.

Abstract: A method for correction of an x-ray image recorded with an x-ray device with an anti-scatter grid for effects of the anti-scatter grid is provided. The anti-scatter grid has a spatially periodically repeating geometrical embodiment, and a calibration image recorded without an imaging object is used. The calibration image and the x-ray image are transformed by a transformation into the position frequency space. In the position frequency space, adaptation parameters describing changes of the calibration image optimizing a measure of matching between the x-ray image and the calibration image are established. For correction, the adapted calibration image is subtracted from the x-ray image, and the x-ray image is transformed back into the position space again using an inverse of the transformation.

Abstract: A method for operating a computed tomograph is provided, wherein an X-ray penetrates an object from different positions, a deposition of an individual dose is effected in at least one part of the object, and an image signal is generated in the detector by way of a transmitted intensity of the X-ray, wherein exposure-related parameters for the respective different positions are individually set such that with respect to a specific position, the share of the associated individual dose is raised if a raising of the individual dose in the specific position brings about a greater improvement in the image quality than in another position, or the share of the associated individual dose is lowered if a lowering of the individual dose in the specific position brings about a smaller deterioration in the image quality than in another position, in order to lower stochastic risks for mutations and uncontrolled cell growth.

Abstract: A method is provided for determining a navigation image displaying features of a region of interest of a patient, (e.g., used during a medical intervention). The method includes determining a first subtraction image by recording a first X-ray image with an X-ray device and subtracting a mask image. The method also includes determining a second subtraction image by recording a second X-ray image with the X-ray device and by subtracting the mask image or a further mask image. Additionally, the navigation image is determined by superimposing the first and the second subtraction image. At least one of the subtraction images is preprocessed before the superimposition by transfer from a gray-value space into a color space that is different from a color space of the other subtraction image. The navigation image is determined in color and/or the dynamics of at least one of the subtraction images are compressed.

Abstract: X-ray image data of an examination subject is acquired for an acquisition period by an X-ray detector of an X-ray system simultaneously with a decay process of a radioactive material taking place in or on the examination subject. The X-ray image data includes information relating to an X-ray attenuation distribution of the examination subject and information relating to the decay process. Correction image data representing the information relating to the decay process in the X-ray image data for the acquisition period is determined. Corrected X-ray image data for the acquisition period is generated using the X-ray image data and the correction image data.

Abstract: A method to optimally set a position of a form filter in an x-ray image recording apparatus is proposed. The x-ray image recording apparatus has an x-ray radiation source and an x-ray radiation detector. An x-ray image is firstly recorded in a first position of the form filter. A new position of the filter is then calculated and automatically set with the aid of the x-ray image. A new x-ray image is then recorded. With a minimal dose of a patient, the method enables low contrast images to be recorded for a minimal main dose of the patient, in particular in a sequence.

Abstract: A method and apparatus for determining an x-ray image data record of a target location subjected to a movement using an x-ray device. A number of basic images of the target location are recorded using a basic exposure time in each case and the x-ray image data record corresponding to an x-ray image with a longer exposure time is determined by combining basic images registered with one another. At least one quality value assigned hereto and relating to the movement in the target location during the recording is determined for each basic image and the contribution of a basic image to the x-ray image data record is determined as a function of the quality value.

Abstract: An x-ray recording system is disclosed for x-ray imaging of an object under examination by way of direct measurement of an interference pattern, especially for differential, real-time capable phase-contrast imaging. In at least one embodiment, the system includes with at least one x-ray emitter for creating quasi-coherent x-ray radiation; an x-ray image detector, including a detector layer and detector pixels arranged in a matrix; and a diffraction or phase grating, disposed between the object under examination and the x-ray image detector, configured to create an interference pattern, directly detectable in the nth Talbot order by an x-ray image detector with a very high achievable local resolution, which amounts to at least half the wavelength of the interference pattern in accordance with the Nyquist theory arising in the nth Talbot order.

Abstract: An adaptive X-ray filter for varying a local intensity of X-ray radiation includes a first chamber containing a magnetorheological or electrorheological first liquid, a second chamber containing a second liquid that absorbs X-ray radiation, and a flexible membrane that separates the first chamber from the second chamber. Using the flexible membrane, a layer thickness ratio of the first liquid and the second liquid may be varied. A heating apparatus that heats the second liquid is arranged in the adaptive X-ray filter. The second liquid is a liquid metal.

Abstract: A method for operating a computed tomograph is provided, wherein an X-ray penetrates an object from different positions, a deposition of an individual dose is effected in at least one part of the object, and an image signal is generated in the detector by way of a transmitted intensity of the X-ray, wherein exposure-related parameters for the respective different positions are individually set such that with respect to a specific position, the share of the associated individual dose is raised if a raising of the individual dose in the specific position brings about a greater improvement in the image quality than in another position, or the share of the associated individual dose is lowered if a lowering of the individual dose in the specific position brings about a smaller deterioration in the image quality than in another position, in order to lower stochastic risks for mutations and uncontrolled cell growth.

Abstract: A radiation detector, in particular an X-ray radiation detector, in the form of a flat-panel detector, may comprise a scintillator layer applied to a substrate and comprising elongated needles made from a scintillator material forming the scintillator layer, and an actively readable pixel array composed of photodiodes, wherein the thickness of the scintillator layer may be in the range of 900 ?m-2500 ?m, and wherein the angle at which the needles stand relative to the pixel array, starting from 90° in the center of the detector, may decrease with increasing distance from the center of the detector.

Abstract: A buffer on detector elements of an X-ray radiation detector can be used, when acquiring a number of 2D X-ray image data records with the aid of an X-ray angiography system, to acquire 2D image data records at a relatively short interval one after the other with the aid of different X-ray spectra, to allow dual-energy imaging, which may be of particularly good quality.