Abstract: In a computer tomography system having an x-ray detector with a detector surface at which sensor pixels, for detection of x-ray radiation, are distributed non-uniformly, and a method for operating such a system, either a pitch factor is selected, and a value range for an extent of a reconstruction field for image data is determined dependent on the distribution of the sensor pixels and dependent on the selected pitch factor, or a value for the extent of the reconstruction field is selected, and a value range for the pitch factor is determined dependent on the distribution of the sensor pixels and dependent on the selected value for the extent of the reconstruction field.

Abstract: A method and an imaging system are disclosed. The method, for determining at least one value of at least one recording parameter for a recording of an X-ray image of a patient positioned on an examination table, uses contactless scanning of at least part of the surface of the patient via at least one electromagnetic sensor, to calculate the three-dimensional contour of the scanned surface without additional exposure to radiation. At least one anatomic landmark of the patient can be identified using the three-dimensional contour, and the position of the anatomic landmark is determinable in the coordinate system of the table. The value of the recording parameter is determinable using the position of the anatomic landmark. The value of the recording parameter is determinable quickly and easily since contactless scanning of surfaces can be achieved quickly and easily in terms of technology.

Abstract: A method is for processing a first image data set including a first image value tuple associated with a volume element of a region of an object to be imaged. In an embodiment, a second image data set is generated based upon the first image data set, including a second image value tuple associated with the volume element, a base material decomposition being capable of being carried based upon the second image data set and based upon a base material set; a starting area and a target area are selected as a function of the base material set, the first image value tuple being located in the starting area; the second image value tuple is ascertained based upon the first image value tuple, the second image value tuple being associated with the first image value tuple via image value tuple imaging and being located in the target area.

Abstract: An X-ray imaging method is for generating contrast-enhanced image data relating to an examination region of an object to be examined. In an embodiment of the method, first contrast-agent influenced measured X-ray projection data with a first X-ray energy spectrum and at least one set of second contrast-agent influenced measured X-ray projection data with a second X-ray energy spectrum are acquired from the examination region. Subsequently, image data assigned to a third X-ray energy spectrum with a third mean energy, based on the first and at least second measured X-ray projection data is reconstructed based on the first and at least second measured X-ray projection data that has been acquired. A mean energy of the first X-ray energy spectrum and a mean energy of the second X-ray energy spectrum are selected as a function of a dimension parameter value of the object that is to be examined.

Abstract: An X-ray system, in particular a computed tomography system, for acquiring projection data of an examination subject is described. In an embodiment, the X-ray system includes an X-ray emitter arrangement including a number of X-ray radiation sources and a number of photon-counting detectors including at least two detection thresholds. In this configuration, the X-ray emitter arrangement is embodied so as to generate X-ray radiation including at least two X-ray radiation spectra. Furthermore, the number of photon-counting detectors are arranged and embodied so as to detect at least the X-ray radiation passing through the examination subject in an energy-resolved manner in the form of projection data. An image reconstruction method is also disclosed.

Abstract: A method, a computer program, a computer program product and a computed tomography system are disclosed. The image data is a spatially three-dimensional reconstruction. At least one value for an image metric of the image data is determined. A motion field for motion compensation of the image data is then determined on the basis of image data as a function of the image metric. Essentially, partial image data is determined, wherein the partial image data corresponds in each case to the spatially three-dimensional reconstruction from scan data of an angular sub-range. The motion field of the image data is determined at the control points via an optimization method as a function of the image metric, so that, thereafter, the partial image data is transformed in accordance with the motion of the motion field. New image data is then produced by merging the partial image data.

Abstract: A method is based on first projection data, recorded during a relative rotational movement between an x-ray source of a CT device and at least one examination object lying partly outside the field of view of the CT device. Contour data of the surface of the examination object is useable to enhance the reconstruction of the incomplete first projection data. The spatial correlation between the first projection data and the contour data is known. The first projection data is expanded by way of the contour data to modified projection data, so that the modified projection data includes information about the contour of the examination object lying outside the field of view of the CT device. In an embodiment of the inventive reconstruction of image data by way of the modified projection data, fewer or no artifacts occur by comparison with reconstruction of image data from just the first image data.

Abstract: A method is for local improvement of the image quality of an imaging X-ray acquisition. In an embodiment, the method includes localizing an imaging region of a structure; selecting an environment of the imaging region; setting an acquisition parameter for the environment of the imaging region, wherein the acquisition parameter for the environment of the imaging region is different from a region outside of the environment of the imaging region; and acquiring an image dataset.

Abstract: A method is disclosed for reconstructing image data of an examination object from measured data, the measured data being captured during a rotating movement of a radiation source of a computed tomography system around the examination object. In at least one embodiment, different iteration images of the examination object are determined successively from the measured data by way of an iterative algorithm, wherein with the iterative algorithm the current iteration image at any one time is high-pass-filtered and weighted as a function of contrast using a variable which contains contrast information relating to the current iteration image at that time.

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 method for the automatic determination of a contrast agent protocol for a contrast agent-enhanced medical imaging method is described. The method includes an overview recording of a region of interest of an object under examination. In addition, an image recording protocol including a plurality of recording parameters is defined on the basis of the overview recording. Furthermore, recording time points are determined for a plurality of z-positions of the region of interest on the basis of the image recording protocol. In addition, the structures acquired with the overview recording are assigned to the recording time points determined. Finally, a contrast agent protocol including the temporal course of a contrast agent injection curve is defined as a function of the acquired structures and the assigned recording time points. A contrast agent protocol determination device is also described, as well as an imaging medicinal device.

Abstract: A method is described for determining the velocity of a fluid in a region to be investigated using an imaging method, preferably computer tomography, of an investigation object. In the method, a plurality of separately spaced sub regions of a region to be investigated, through which sub regions the fluid is flowing, are defined. Time-dependent image data is produced for the plurality of separately spaced sub regions. Moreover, time/density curves are produced with, in each case, a plurality of time-dependent intensity values on the basis of the time-dependent image data for the separately spaced sub regions. Additionally, the time displacement in the time/density curves is determined. Lastly, the fluid velocity is determined on the basis of the time displacement determined in the time/density curves. A fluid velocity determination device is also described. Moreover, a computer tomography system is described.

Abstract: A filter arrangement is described. The filter arrangement includes an inner filter region, covering a cross-sectional area of a fan beam of a first X-ray source, and an outer filter region covering, together with the inner filter region, a larger cross-sectional area of a larger fan beam of a second X-ray source. The inner filter region has a first spectral filter function. The outer filter region is divided into a first subregion having a second spectral filter function and a second subregion having a third different spectral filter function. A computed tomography system is described. A method for producing a filter arrangement for a spectral filtering of X-ray radiation of a CT system having a first X-ray source and a second X-ray source is also presented. A method for reconstructing image data on the basis of projection measurement data is also described.

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 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 recording unit is rotatable about an axis of rotation, and includes an X-ray emitter and detector to detect X-rays from a fan-shaped region. The fan-shaped region is asymmetrical in relation to a vertical to the axis of rotation, running through the X-ray detector wherein the two edges of the fan-shaped region, on rotation, in each case tangentially delimit a first projection region and a second projection region. The second projection region abuts the first projection region. A method includes recording projections of the two projection regions during a full rotation of the recording unit for the reconstruction of a first image of the first projection region in such a way that the projection angle intervals in each case exhibit the same start angle. It further includes reconstructing a second image of the second projection region to merge the two reconstructed projection regions to form one unitary image.

Abstract: A method for the automated determination of an adjusted setting for signal analysis parameters of an x-ray detector is described. With an embodiment of the method, information relating to the dimensions of the object to be examined, the x-ray attenuation in the object to be examined, the nature of the examination and the examination region of the object to be examined is acquired. Signal analysis parameter values are then determined based on the acquired information. A method for automatically setting signal analysis parameters of an x-ray detector is also described. A facility for determining an adjusted setting for signal analysis parameters of an x-ray detector is also described. An x-ray system is also described.

Abstract: A mammography CT system is disclosed which includes an X-ray generator; and a first radiator-detector system. A contrast medium, including an opacifying element including an absorption peak in a first energy range, is useable for tomographic imaging of a female breast of a patient. After filtering, the X-rays with a prespecified tube voltage that form at an anode, are configured to emit an X-ray spectrum having a second energy range, wherein the radiator-detector system is configured to acquire a plurality of circumferential projections around the breast. The first energy range is a part of the second energy range and the second energy range includes an upper limit of less than 70 keV and a lower limit of greater than 20 keV. A corresponding method for generating tomographic mammography CT images is also disclosed.

Abstract: A method is disclosed for determining a multi-energy image via an x-ray device, including an x-ray source and an x-ray detector. The method includes a temporal sequence of individual steps. A first contrast agent-assisted image of an object area is first recorded with a first energy. Then a second contrast agent-assisted image of an object area is recorded with a second energy. A third recording of a third contrast agent-assisted image of the object area is now made with the first energy. By taking the temporal change in the contrast agent signal into account between the first and the third image, a multi-energy image is finally determined by means of the three recordings.

Abstract: A method for selecting a radiation shaping filter is disclosed, which modifies the spatial distribution of the intensity and/or the spectrum of x-rays of an x-ray source of an imaging system. In an embodiment, anatomical measurement data of an object under examination is recorded, from which with the aid of the imaging system image data is created. The radiation shaping filter is selected automatically on the basis of the recorded anatomical measurement data of the object under examination. An imaging system, in which a radiation shaping filter is selected, is further disclosed.