Abstract: A recording and reconstruction of image data of a predetermined object of an examination object is performed by an x-ray system. The x-ray system determines a number of elliptical cylinders so that the object is arranged entirely in the volumes of the cylinders. Data within each of the cylinders is recorded by the x-ray system. The image data of the object is reconstructed based on the data recorded for each of the cylinders.

Abstract: The embodiments relate to a method, an apparatus, and a computer program for evaluating an x-ray image of a breast produced during a mammography. In order to simplify the evaluation of such an x-ray image in respect of the breast density, a method is proposed to automatically determine the masking risk caused by the mammographically dense tissue and to use this for categorizing, describing, and/or representing the breast density.

Abstract: The embodiments relate to a method, an apparatus, and a computer program for evaluating an x-ray image of a breast produced during a mammography. In order to simplify the evaluation of such an x-ray image in respect of the breast density, a method is proposed to automatically determine the masking risk caused by the mammographically dense tissue and to use this for categorizing, describing, and/or representing the breast density.

Abstract: With a device and an associated method, an ultrasound unit is coupled with a coupling unit to an existing x-ray unit. The ultrasound unit is guided with the aid of controllable elements of a positioning unit of the x-ray unit on a patient for an ultrasound examination. In this manner X-ray recordings and ultrasound recordings of an object can be produced.

Abstract: A method for creating a selective vessel image within a volume section of an examination object using an imaging system is provided. The method includes creating a vessel image of the volume section. The creating of the vessel image includes acquiring imaging data of the volume section within a predetermined time interval using the imaging system, determining a maximum opacity within the time interval on account of a contrast agent administered to the examination object per pixel of the vessel image, and segmenting vessels. The segmenting includes deciding, depending on the maximum opacity of the pixel, whether the respective pixel belongs to the vessel. The method also includes determining a contrast agent arrival time per pixel of the vessel image, and segmenting whether the respective vessel of the vessel image belongs to a vessel of the selective vessel image.

Abstract: A method for the automatic generation of synthetic projections of an examination object from at least one three-dimensional data set acquired by way of a medical imaging system. The three-dimensional data set is used as a basis for determining position information relating to the arrangement of structures of the examination object and at least one synthetic projection based on the position information. We also describe a projection-image-ascertaining facility for the automatic generation of synthetic projections and a computer program product for executing the method.

Abstract: A recording and reconstruction of image data of a predetermined object of an examination object is performed by an x-ray system. The x-ray system determines a number of elliptical cylinders so that the object is arranged entirely in the volumes of the cylinders. Data within each of the cylinders is recorded by the x-ray system. The image data of the object is reconstructed based on the data recorded for each of the cylinders.

Abstract: A method ascertains a time for a fresh calibration for ascertaining up-to-date calibration parameters of an x-ray device. The x-ray device has multiple degrees of freedom of movement for its recording arrangement. X-ray images of a calibration phantom are recorded for recording positions of the recording arrangement and are evaluated to ascertain the calibration parameters allowing ascertainment of geometry parameters. In multiple operating phases, situated between two calibrations, of a further x-ray device of identical design to the x-ray device, a piece of use information describing the accumulated use of the degrees of freedom of movement during the operating phase and a piece of difference information describing the difference in the calibration parameters between the calibrations delimiting the operating phase, is ascertained and used or determining the time for a fresh calibration.

Abstract: A method is provided for the automatic determination of at least one joint load information item concerning a joint of a patient, wherein at least one image data set of the loaded joint is recorded by an imaging apparatus. Several image data sets of the joint, of which at least one is three-dimensional, are recorded in each case for different loading states by the imaging apparatus. By combined evaluation of the image data sets, the at least one joint load information item is determined.

Abstract: The embodiments relate to a method, an apparatus, and a computer program for evaluating an x-ray image of a breast produced during a mammography. In order to simplify the evaluation of such an x-ray image in respect of the breast density, a method is proposed to automatically determine the masking risk caused by the mammographically dense tissue and to use this for categorizing, describing, and/or representing the breast density.

Abstract: An imaging tomosynthesis system, in particular a mammography system, includes a computer system which generates x-ray projections of an examination object from a plurality of projection angles. The system further reconstructs a stack of tomosynthetic slice images, generates at least one overview image of density values of an examination object from the tomosynthetic image data, selects characteristic density values in the stack at at least one plane position, and determines the geometric level of the at least one selected characteristic density value. The overview image is then displayed with a color value correlated to the geometric level of the at least one characteristic density value.

Abstract: A method for creating a selective vessel image within a volume section of an examination object using an imaging system is provided. The method includes creating a vessel image of the volume section. The creating of the vessel image includes acquiring imaging data of the volume section within a predetermined time interval using the imaging system, determining a maximum opacity within the time interval on account of a contrast agent administered to the examination object per pixel of the vessel image, and segmenting vessels. The segmenting includes deciding, depending on the maximum opacity of the pixel, whether the respective pixel belongs to the vessel. The method also includes determining a contrast agent arrival time per pixel of the vessel image, and segmenting whether the respective vessel of the vessel image belongs to a vessel of the selective vessel image.

Abstract: An imaging tomosynthesis system, in particular a mammography system, includes a computer system which generates x-ray projections of an examination object from a plurality of projection angles. The system further reconstructs a stack of tomosynthetic slice images, generates at least one overview image of density values of an examination object from the tomosynthetic image data, selects characteristic density values in the stack at at least one plane position, and determines the geometric level of the at least one selected characteristic density value. The overview image is then displayed with a color value correlated to the geometric level of the at least one characteristic density value.

Abstract: A method for correcting artifacts in an image dataset reconstructed by filtered back projection is proposed. The artifacts are occurred as a result of temporal changes of attenuation values during rotational recording of X-ray projection images with an angular speed. A linear, analytically-derived, filter-type relationship between the attenuation values of the image dataset at a reference point and the real attenuation values is determined from the sum of a respective application of an angle speed-dependent weighting factor, a point spread function and a temporal derivation, evaluated at the reference time. The linear relationship is inverted and the inverted linear relationship is applied to the attenuation values of the image dataset for the correction.

Abstract: A method for calculating perfusion data, such as blood volume or blood flow from 2-D angiography data or DSA sequences, is proposed. An angiography scene is recorded using specific acquisition parameters to generate the 2-D angiography data or DSA sequences with administration of contrast agent based on a multiplicity of individual angiography images. A region of interest is defined suitable for comparison purposes. The volume segments are defined by the region of interest. The time/contrast curve is determined in the volume segments. Perfusion data for calculating the relative perfusion data is ascertained. The perfusion data is compared and the relative perfusion data is calculated. The calculated relative perfusion data is not specified in terms of absolute physical quantities, but is provided simply as ratios, such as left/right or before/after.

Abstract: A method for correcting artifacts in an image dataset reconstructed by filtered back projection is proposed. The artifacts are occurred as a result of temporal changes of attenuation values during rotational recording of X-ray projection images with an angular speed. A linear, analytically-derived, filter-type relationship between the attenuation values of the image dataset at a reference point and the real attenuation values is determined from the sum of a respective application of an angle speed-dependent weighting factor, a point spread function and a temporal derivation, evaluated at the reference time. The linear relationship is inverted and the inverted linear relationship is applied to the attenuation values of the image dataset for the correction.