Abstract: In an X-ray imaging procedure, an input image and an input mask image are generated on the basis of first and second detector data of an X-ray flat panel detector. By applying noise suppression, a mask signal image and a signal image are generated on the basis thereof. By calculating the difference between the signal image and the mask signal image, a subtraction image is generated. The subtraction image is scaled so that a number of pixels is increased in a first image direction. A results image is generated in which the scaled subtraction image and a noise image are added together.

Abstract: A method for alternately displaying graphical representations includes: a) providing a first image that includes a presentation of an anatomical structure of an object of interest; b) providing a second image that reproduces a spatial and/or time-related change in the object of interest; c) displaying a graphical representation of the first or second image on a display surface of a display unit; and d) displaying a graphical representation of the respective other image on the display surface of the display unit, wherein acts c) and d) are carried out one after the other and acts b) to d) are carried out repeatedly.

Abstract: A technique for controlling a compensation actuator system for compensating a shadow of an X-ray scattered radiation absorption grid in an X-ray image recorded with a pivotably mounted X-ray device, for example in real time, includes a method with a step of receiving motion state data indicative of a motion state of an X-ray device. The X-ray device is mounted on a pivotable arm. The motion state is assigned to a time of recording of an X-ray image by the X-ray device. A quality measure of the X-ray image with respect to a shadow of an X-ray scattered radiation absorption grid, which is arranged on the detector of the X-ray device, is determined. A control signal for a compensation actuator system for adjusting the position of the X-ray scattered radiation absorption grid is determined depending on the received motion state data and depending on the determined quality measure. Determining the control signal comprises optimizing the quality measure.

Abstract: A computer-implemented method for evaluating an X-ray image includes: segmenting the hollow organ structure in the X-ray image; determining center lines and edge boundaries of the segmented hollow organ structure and ascertaining a diameter of each hollow organ along its center line; ascertaining an image absorption value, describing the increase in absorption due to a contrast agent in the hollow organ compared to surroundings of the hollow organ, along the center line of each hollow organ; ascertaining, for each image absorption value, a theoretical computing absorption value expected when the hollow organ is completely filled with the contrast agent, by using at least the diameter and contrast agent information; determining a filling level along the center line of each hollow organ of the hollow organ structure by comparing the image absorption value with the computing absorption value; and outputting filling level information including the filling levels.

Abstract: A method for operating an X-ray imaging system includes outputting first X-ray beams onto an X-ray detector by an X-ray source for acquisition of a first X-ray capture of an object under examination. The object under examination is arranged between the X-ray source and the X-ray detector and is passed through by the first X-ray beams. The X-ray detector acquires an entry dose of the first X-ray beams after passage through the object under examination. A parameter value of at least one parameter for output of second X-ray beams by the X-ray source for acquisition of a second X-ray capture of the object under examination is ascertained by a control system. The parameter value is ascertained by the control system according to a specified ascertainment method as a function of a foreground substance of a foreground object, a background substance of a background object, and the entry dose.

Abstract: A method for operating an X-ray imaging system includes outputting first X-ray beams onto an X-ray detector by an X-ray source for acquisition of a first X-ray capture of an object under examination. The object under examination is arranged between the X-ray source and the X-ray detector and is passed through by the first X-ray beams. The X-ray detector acquires an entry dose of the first X-ray beams after passage through the object under examination. A parameter value of at least one parameter for output of second X-ray beams by the X-ray source for acquisition of a second X-ray capture of the object under examination is ascertained by a control system. The parameter value is ascertained by the control system according to a specified ascertainment method as a function of a foreground substance of a foreground object, a background substance of a background object, and the entry dose.

Abstract: Detector data is obtained from a flat panel X-ray detector, and an input image representing an object to be mapped is generated based on the detector data. By applying a noise suppression algorithm to the input image, a signal image is generated. The signal image or an image dependent on the signal image is scaled using an interpolation method so that in a first image direction, a number of pixels of the scaled signal image is greater than a corresponding number of pixels of the input image. By forming a difference between the input image and the signal image, a noise image is generated. The noise image is modified by expanding a spatial frequency spectrum of the noise image so that a maximum spatial noise frequency corresponding to the first image direction is increased. A result image is generated by adding the scaled signal image and the modified noise image.

Abstract: A method is for the automatic regulation of radiation doses of a person for an examination with a medical X-ray device, which has a first dose regulation. In an embodiment, the method includes a specification of X-ray parameters of an X-ray examination based upon patient information and a specification of a dose regulation as a function of X-ray parameters as well as a limit value for deterministic radiation damage and/or a guide value for stochastic effective doses.

Abstract: In order to achieve effective cooling, an X-ray emitter with a tube housing having a vacuum is provided. At least one anode is arranged in the tube housing, such that the anode is irradiated by an electron beam generated in a cathode and accelerated through an electrical field. The anode is excited, such that an X-ray deceleration radiation is emitted. The X-ray emitter has a thermoelectric converter (e.g., at least one thermophotovoltaic cell) for generating electrical energy. The thermoelectric converter is arranged, such that the thermoelectric converter may be irradiated at least in part by a heat radiation emanating from the anode.

Abstract: A computer-implemented method for evaluating an X-ray image includes: segmenting the hollow organ structure in the X-ray image; determining center lines and edge boundaries of the segmented hollow organ structure and ascertaining a diameter of each hollow organ along its center line; ascertaining an image absorption value, describing the increase in absorption due to a contrast agent in the hollow organ compared to surroundings of the hollow organ, along the center line of each hollow organ; ascertaining, for each image absorption value, a theoretical computing absorption value expected when the hollow organ is completely filled with the contrast agent, by using at least the diameter and contrast agent information; determining a filling level along the center line of each hollow organ of the hollow organ structure by comparing the image absorption value with the computing absorption value; and outputting filling level information including the filling levels.

Abstract: Systems and methods for a good x-ray quality with as low a radiation exposure for a patient as possible. The method provides control settings for recording a series of x-ray images by an x-ray device during a flow of contrast agent through a liquid-filled hollow organ of a patient.

Abstract: The disclosure relates to a method for controlling a medical X-ray device. The method includes: acquiring at least one X-ray image of a region of examination of an object undergoing examination by the medical X-ray device, wherein a medical object is arranged in the region of examination; generating an object image based on the at least one X-ray image; and establishing a determinability parameter, for assessing the determinability of the medical object based on the object image. The method is carried out iteratively, beginning with the acquiring of an X-ray image, until a termination condition occurs based on the most recently established determinability parameter. The disclosure furthermore relates to a computer-implemented method for providing a trained function, a computer-implemented method for providing a further trained function, a medical X-ray device, a training unit, a computer program product, and a computer-readable storage medium.

Abstract: A method is provided for operating a medical X-ray device when carrying out an X-ray examination. In order to reduce the duration of the scan for the reliable determination of changes over time in a body region of an examination subject by an X-ray based subtraction method, the method includes recording a plurality of first X-ray images of a body region of an examination subject, wherein the recording of the plurality of first X-ray images ensues at a constant X-ray imaging frequency and a constant X-ray dose for each X-ray image recording.

Abstract: The invention relates to a method (62, 64) for creating x-ray images as well as to an x-ray system. During the creation of an x-ray image, a slit diaphragm (16) is moved in front of an object (24) to be x-rayed, along a path extending between a radiation source (10) and said object (24), in order for the object (24) to be scanned. X-rays emitted by the radiation source (10) are detected by a detector (20) upon penetration of the slit diaphragm (16) and the object (24) to be x-rayed. In order to create an x-ray image using a simplified slot scanning technique, the x-ray image is created without the need for a second slit diaphragm (16) between the object (24) to be x-rayed and the detector (20), and only the radiation of which the intensity (60), detected by the detector (20) during the scan, exceeds a predefined threshold value is processed.

Abstract: Operating a medical image recording device in the context of an image recording routine for a patient is provided. The image recording routine serves an image recording purpose. The image recording device is controlled based on operating parameters implemented by a controller of the image recording device. The operating parameters are identified completely automatically by an identification algorithm from input data describing at least the patient in the form of a patient model and/or the image recording purpose, and from a registration of the patient with a coordinates system of the image recording device. The operating parameters are used to control the image recording device. An examination region that is to be recorded for the patient and the image recording purpose are derived based on the registration.

Abstract: The disclosure relates to a method for controlling a medical X-ray device. The method includes: acquiring at least one X-ray image of a region of examination of an object undergoing examination by the medical X-ray device, wherein a medical object is arranged in the region of examination; generating an object image based on the at least one X-ray image; and establishing a determinability parameter, for assessing the determinability of the medical object based on the object image. The method is carried out iteratively, beginning with the acquiring of an X-ray image, until a termination condition occurs based on the most recently established determinability parameter. The disclosure furthermore relates to a computer-implemented method for providing a trained function, a computer-implemented method for providing a further trained function, a medical X-ray device, a training unit, a computer program product, and a computer-readable storage medium.

Abstract: A method is for the automatic regulation of radiation doses of a person for an examination with a medical X-ray device, which has a first dose regulation. In an embodiment, the method includes a specification of X-ray parameters of an X-ray examination based upon patient information and a specification of a dose regulation as a function of X-ray parameters as well as a limit value for deterministic radiation damage and/or a guide value for stochastic effective doses.

Abstract: The disclosure relates to a method and an imaging device for generating a new roadmap image of a target object. For the method, a first subtraction image is generated from a first mask image and a contrast agent image of the target object. A parameter value of a parameter of the imaging device that affects the acquisition of images by the device is then changed. A third mask image of the target object is acquired automatically by the imaging device using the changed parameter value. From a second examination image subsequently acquired using the changed parameter value, a third subtraction image is generated by subtraction of the third mask image. The new roadmap image is generated using the first subtraction image and the third subtraction image.

Abstract: A method for training a function of an X-ray system that has a positioning mechanism such as a C-arm, a detector, and, in a beam path in front of the detector, an anti-scatter grid. Positioning of the detector at a large number of different positions occurs. The positioning mechanism is deflected and/or distorted. Recording of at least one X-ray photograph in each of the positions then takes place, and the method further includes machine learning of artifacts generated by the anti-scatter grid from all X-ray photographs for the function.

Abstract: A method is provided for operating a medical X-ray device when carrying out an X-ray examination. In order to reduce the duration of the scan for the reliable determination of changes over time in a body region of an examination subject by an X-ray based subtraction method, the method includes recording a plurality of first X-ray images of a body region of an examination subject, wherein the recording of the plurality of first X-ray images ensues at a constant X-ray imaging frequency and a constant X-ray dose for each X-ray image recording.