Abstract: A method is disclosed for generating an image. An embodiment of the method includes detecting a first projection data set via a first group of detector units, the first group including a first plurality of first detector units, each having more than a given number of detector elements; detecting a second projection data set via a second group of detector units, the second group including a second plurality of second detector units, each including, at most, the given number of detector elements; reconstructing first image data based on the first projection data set; reconstructing second image data based on the second projection data set; and combining the first image data and the second image data. A non-transitory computer readable medium, a data processing unit, and an imaging device including the data processing unit are also disclosed.

Abstract: A computer program, a system and a method for normalizing medical images from a type of image acquisition device using a machine learning unit are disclosed. An embodiment of the method includes receiving a set of image data with images; decomposing each of the images of the set of images into components by incorporating at least information from different settings of the image acquisition device-specific image processing algorithms; and normalizing each of the components via a machine learning unit by processing at least information from the different settings of the image acquisition device-specific processing algorithms to provide a set of normalized images with a relatively decreased variability score.

Abstract: A method is for creating a synthetic mammogram based upon a dual energy tomosynthesis recording of an examination region. In an embodiment the method includes making a low energy tomosynthesis recording with a first X-ray energy spectrum; making a high energy tomosynthesis recording with a second X-ray energy spectrum of relatively higher energy compared with the first X-ray energy spectrum, wherein the examination region includes a contrast medium distribution; determining a subtraction volume based upon the high energy tomosynthesis recording and the low energy tomosynthesis recording; generating a three-dimensional probability map with a weighting factor per voxel based upon the subtraction volume; and creating a synthetic mammogram based upon the three-dimensional probability map.

Abstract: A method and energy-sensitive CT device are disclosed for motion correction of a computed tomography image. In an embodiment, the method includes: provisioning spectral CT data of an examination region with a moving object, the spectral CT data being recorded with an energy-sensitive CT device and including CT data at at least one energy level, and the at least one energy level of the CT data being adapted to a structure in the moving object; identifying the structure in the CT data at at least one energy level, of the at least one energy level, adapted to the structure; calculating a motion vector field of the structure identified; and motion correcting the spectral CT data by the motion vector field calculated to produce a motion-corrected CT image.

Abstract: An X-ray system, in particular a computed tomography system, for acquiring projection data of an examination subject includes one or more X-ray radiation sources, at least one of the one or more X-ray radiation sources including at least one prefilter, the one or more X-ray radiation sources being configured to generate X-ray radiation including at least two X-ray radiation spectra, the at least one prefilter being configured to at least one of spatially distribute or temporally modify the X-ray radiation, and a one or more photon-counting detectors configured to detect the X-ray radiation passing through the examination subject in an energy-resolved manner according to at least two detection thresholds, and generate projection data based on the detection.

Abstract: An x-ray imaging system includes an x-ray source configured to emit x-ray radiation towards a sample, and a primary detector configured to detect x-ray radiation from the x-ray source passing through the sample. The x-ray imaging system also includes a secondary detector configured to detect x-ray radiation from the x-ray source scattered in the sample, and imaging optics configured to guide x-ray radiation scattered in the sample onto the secondary detector.

Abstract: A method is for calibrating an X-ray measuring facility. The method includes preparing the facility for measurement for a resolution of a plurality of different energy intervals; positioning a test object in a beam path of an X-ray beam; irradiating the test object via the X-ray beam, and during the irradiating, an intensity measurement of the test object appropriately resolved according to the energy intervals is carried out by the facility; determining an absorption function of the test object using the intensity measurement; preparing one of the energy intervals as a reference interval such that the absorption function has a negligible energy dependency over the reference interval; determining a correction function of the absorption function, for at least one further energy interval of the energy intervals, using at least one value of the absorption function in the reference interval; and calibrating the facility using the correction function determined.

Abstract: A method and an X-ray detector are for correcting a spatially resolved photon scan of the X-ray detector. In an embodiment, the X-ray detector includes processing circuitry configured to: generate, from an incident X-ray photon, a signal contribution in a first electrical signal in a spatially resolved manner, a reference value being defined by an absence of X-ray photons; resolve, in relation to the reference value, positive signal contributions of the first electrical signal and negative signal contributions of the first electrical signal; and provide the positive signal contributions resolved and the negative signal contributions resolved for further processing.

Abstract: A method and energy-sensitive CT device are disclosed for motion correction of a computed tomography image. In an embodiment, the method includes: provisioning spectral CT data of an examination region with a moving object, the spectral CT data being recorded with an energy-sensitive CT device and including CT data at at least one energy level, and the at least one energy level of the CT data being adapted to a structure in the moving object; identifying the structure in the CT data at at least one energy level, of the at least one energy level, adapted to the structure; calculating a motion vector field of the structure identified; and motion correcting the spectral CT data by the motion vector field calculated to produce a motion-corrected CT image.

Abstract: A method is for generating CT image data with spectral information from an examination region of a patient. According to an embodiment, the examination region is exposed to polychromatic X-radiation. Data from the examination region, including a first projection measurement data record and at least one second projection measurement data record, is captured via a photon counting detector. At least one second projection measurement data record with reduced resolution is generated based upon the at least one second projection measurement data record. The first and at least one second projection measurement data records are then transmitted to an image generation unit. Finally, the resolution of the first projection measurement data record is transferred onto the at least one second projection measurement data record with reduced resolution and/or an image data record based on the at least one second projection measurement data record with reduced resolution. A system is also disclosed.

Abstract: A method is for calibrating an X-ray measuring facility. The method includes preparing the facility for measurement for a resolution of a plurality of different energy intervals; positioning a test object in a beam path of an X-ray beam; irradiating the test object via the X-ray beam, and during the irradiating, an intensity measurement of the test object appropriately resolved according to the energy intervals is carried out by the facility; determining an absorption function of the test object using the intensity measurement; preparing one of the energy intervals as a reference interval such that the absorption function has a negligible energy dependency over the reference interval; determining a correction function of the absorption function, for at least one further energy interval of the energy intervals, using at least one value of the absorption function in the reference interval; and calibrating the facility using the correction function determined.

Abstract: A method and an X-ray detector are for correcting a spatially resolved photon scan of the X-ray detector. In an embodiment, the X-ray detector includes processing circuitry configured to: generate, from an incident X-ray photon, a signal contribution in a first electrical signal in a spatially resolved manner, a reference value being defined by an absence of X-ray photons; resolve, in relation to the reference value, positive signal contributions of the first electrical signal and negative signal contributions of the first electrical signal; and provide the positive signal contributions resolved and the negative signal contributions resolved for further processing.

Abstract: A method is for imaging a region of interest of an object to be examined based on projection measurement data recorded during a rotational movement of an X-ray source-detector system around the object to be examined in a first angular sector of at least 180° . In an embodiment, the method includes generating first start-image data; selecting partial projection measurement data with a second angular sector from the projection measurement data, the second angular sector being a subregion of the first angular sector; comparing the first start-image data generated, or corrected start-image data, with the partial projection measurement data, and generating first image data based upon the comparing; and artifact correcting the first image data via a trained correction unit, to create the corrected start-image data, the first image data and the corrected start-image data each respectively comprising a substantially complete image of the region of interest.

Abstract: A method for reconstructing image data during CT imaging is described. In the method, a plurality of independent data records of projection measured data are captured. A combined data record is then determined based on the captured data records. In addition, morphological information is determined based on the combined data record. A target data record is also determined based on the captured independent data records. A target image data record is reconstructed based on the target data record and the determined morphological information. An image data determination facility and a computed tomography system are also described.

Abstract: A filter is disclosed for the spectral filtration of X-rays emanating from an X-ray source which cross an object under examination and are detected by an X-ray detector in at least two different spectral regions. After crossing the object under examination, the X-rays have an energy spectrum which displays a characteristic distribution for the anode material of the X-ray source. In an embodiment, the filter is configured to suppress part of the energy spectrum comprising the focal point of the energy spectrum. A corresponding X-ray system and method are also disclosed.

Abstract: An X-ray detector is disclosed, including a detection unit to generate a detection signal for incident X-ray radiation; a signal analysis module to determine a set of count rates for incident X-ray radiation based upon the detection signal and signal analysis parameters for X-ray radiation; and a switchover control unit for switching between first signal analysis parameters and second signal analysis parameters. When an amount of X-ray radiation is incident on the detection module, a first set of count rates is generated for a first time interval based upon first signal analysis parameters and a second set of count rates is generated for a second time interval based upon second signal analysis parameters, different from the first signal analysis parameters. An X-ray imaging system including the detector; a method for determining count rates for X-ray radiation; and a method for calibrating signal analysis parameters are also disclosed.

Abstract: A system and a method are for quantifying blood loss on the basis of contrast-agent based computed tomography imaging of the torso of a patient. To this end, image data of a computed tomograph is firstly read in, in order thereupon to apply an image analysis method for automatically detecting accumulations of blood. A differentiation method is then carried out to differentiate between pathological and physiological accumulations of blood and a quantification algorithm for calculating and outputting a blood loss value for the pathological accumulations of blood.

Abstract: A method for creating a resultant image for a specifiable, virtual x-ray quanta energy distribution includes capturing a first image dataset of the patient, capturing at least one second image dataset of the patient, and specifying a virtual x-ray quanta energy distribution. The method also includes establishing a spatial density distribution of the patient for at least two materials based on the first image dataset and the at least one second image dataset. The method includes creating a third image dataset of the patient based on the specified virtual x-ray quanta energy distribution and the established spatial material density distributions. The third image dataset represents an x-ray attenuation distribution of the patient corresponding to the specified virtual x-ray quanta energy distribution. The method also includes creating the virtual image from the third image dataset.

Abstract: A method is for generating CT image data with spectral information from an examination region of a patient. According to an embodiment, the examination region is exposed to polychromatic X-radiation. Data from the examination region, including a first projection measurement data record and at least one second projection measurement data record, is captured via a photon counting detector. At least one second projection measurement data record with reduced resolution is generated based upon the at least one second projection measurement data record. The first and at least one second projection measurement data records are then transmitted to an image generation unit. Finally, the resolution of the first projection measurement data record is transferred onto the at least one second projection measurement data record with reduced resolution and/or an image data record based on the at least one second projection measurement data record with reduced resolution. A system is also disclosed.

Abstract: An X-ray detector is disclosed, including a detection unit to generate a detection signal for incident X-ray radiation; a signal analysis module to determine a set of count rates for incident X-ray radiation based upon the detection signal and signal analysis parameters for X-ray radiation; and a switchover control unit for switching between first signal analysis parameters and second signal analysis parameters. When an amount of X-ray radiation is incident on the detection module, a first set of count rates is generated for a first time interval based upon first signal analysis parameters and a second set of count rates is generated for a second time interval based upon second signal analysis parameters, different from the first signal analysis parameters. An X-ray imaging system including the detector; a method for determining count rates for X-ray radiation; and a method for calibrating signal analysis parameters are also disclosed.