Abstract: In order to estimate a radiation load quantity for an imaging system having a radiation source, a base model is obtained for determining the radiation load quantity depending on a set of input variables, which include at least one radiation-source operating parameter. Measurement data measured for the imaging system is obtained that includes the radiation load quantity for a multiplicity of different values of the at least one radiation-source operating parameter. A refined model is generated by adapting the base model depending on the measurement data. Actual values of the set of input variables are defined for the imaging system. The refined model is used to determine, depending on the actual values of the set of input variables, an estimated value of the radiation load quantity.

Abstract: In an X-ray imaging method, a first time length that corresponds to a time length for a contrast agent to flow from a defined contrast-agent injection location to a defined proximal location of a hollow organ, and a second time length that corresponds to a time length for a contrast agent to flow from the proximal location to a defined distal location of the hollow organ are obtained. During a first acquisition phase, a first sequence of projection images is produced. Each projection image at least partially represents the hollow organ under a different respectively defined projection direction. The first acquisition phase begins the first time length after an injection start time for injecting the contrast agent, and a duration of the first acquisition phase equals the second time length. A time-resolved three-dimensional reconstruction of the hollow organ is produced based on the projection images in the first sequence.

Abstract: In an X-ray imaging method, a first time length that corresponds to a time length for a contrast agent to flow from a defined contrast-agent injection location to a defined proximal location of a hollow organ, and a second time length that corresponds to a time length for a contrast agent to flow from the proximal location to a defined distal location of the hollow organ are obtained. During a first acquisition phase, a first sequence of projection images is produced. Each projection image at least partially represents the hollow organ under a different respectively defined projection direction. The first acquisition phase begins the first time length after an injection start time for injecting the contrast agent, and a duration of the first acquisition phase equals the second time length. A time-resolved three-dimensional reconstruction of the hollow organ is produced based on the projection images in the first sequence.

Abstract: To assess a risk of rupture of a hollow organ, at least one first image is obtained that maps a first expansion state of a balloon catheter disposed in the hollow organ. Based on the at least one first image, a balloon size and an internal balloon pressure of the balloon catheter in the first expansion state are determined. At least one second image is obtained that maps a second expansion state of the balloon catheter disposed in the hollow organ. Based on the at least one second image, the balloon size and the internal balloon pressure in the second expansion state are determined. Based on the internal balloon pressures in the first and second expansion states and the balloon sizes in the first and second expansion states, information is generated for assessing a risk of rupture of the hollow organ.

Abstract: A graphical display is adjusted. A dataset having a map and/or a model of a plurality of anatomical and/or medical objects of an object under examination is acquired. A graphical display of the dataset is visualized by a display. Based on a capturing signal, at least one of the plurality of anatomical and/or medical objects being viewed by a viewer of the graphical display is identified. The capturing signal is provided by a capturing unit embodied to capture a partial area of the graphical display currently being viewed by a viewer and to provide the capturing signal in dependence on the captured partial area. The graphical display of the at least one identified object is adjusted by adjusting a display parameter of the graphical display.

Abstract: Angiographic recordings are to be made more informative. To this end, a method for spatiotemporal fusion of time-resolved angiographic data sets is proposed. Respective 4D reconstructions are obtained from angiographic 3D data sets acquired from contrast agents administered at different sites. In both 4D reconstructions, a common vascular region is identified. For each contrast agent bolus, the corresponding time point or time course in the common vascular region is determined. Finally, the two 4D reconstructions are synchronized and fused.

Abstract: A patient model for mapping a set of pose parameters and a set of shape parameters onto a surface grid is provided. Patient image data that represents a spine of a patient is provided, and a patient-specific set of pose parameters and a patient-specific set of shape parameters are determined based on the patient image data. An initial surface grid that represents the spine in an initial state with spine curvature is calculated. The calculation includes applying the patient model to the patient-specific set of pose parameters and the patient-specific set of shape parameters. A target surface grid that represents the spine of the patient in a target state with a straightened spine is provided. By comparing the target surface grid with the initial surface grid, a displacement field for the spine is determined and, depending on the displacement field, support information is generated and displayed visually.

Abstract: A computer-implemented method and system for providing a trained artificial intelligence determination algorithm for correcting x-ray image data with regard to noise effects, for example for scattered radiation correction of the x-ray image data. The determination algorithm, from input data comprising a recorded image dataset, determines a noise effect dataset describing the noise effects to be used for correction of the x-ray image dataset. A statistical physics model parameterized by model parameters is used to describe the noise effects. The model parameters are able to be determined at least in part using the determination algorithm including receiving of training datasets that include x-ray image sub datasets with assigned, known noise effect sub datasets and/or with at least one assigned, noise-free reference image sub dataset, training the determination algorithm using the training datasets, and providing the trained determination algorithm.

Abstract: A method is provided for reducing artifacts occurring due to vessel overlaps in a four-dimensional angiography dataset acquired with administration of a contrast agent, wherein distribution data relating to a concentration of the contrast agent in the blood circulatory system is generated at the respective time points for a three-dimensional vessel dataset of a blood circulatory system or for a reduced dataset derived therefrom, e.g., by a trained function. A color intensity of a pixel showing a contrast agent filling state contained in a respective projection image of the blood circulatory system is distributed according to the distribution data at the respective time point of the acquired projection image across voxels of the vessel dataset that lie along a ray associated with the pixel in the backprojection.

Abstract: A method for managing a virtual patient model of a patient for a series of treatment and/or examination procedures occurring over time, wherein at least at a first time point at which the patient is described by first patient parameters, the patient model describes at least the surface of the patient at the first time point, wherein at least at a second later time point at which the patient is described by second patient parameters, the patient model is extended by at least one model transformation using the first and second patient parameters for describing at least the surface of the patient at the second time point.

Abstract: The disclosure relates to a method for providing a result dataset, a method for providing a trained function, a provisioning unit, a medical imaging device, and a computer program product. The method for providing the result dataset includes capturing medical image data, wherein the medical image data maps a temporal change in an anatomical object in an examination object in a spatially and temporally resolved manner. The method further includes identifying at least one inhomogeneously deforming region of the anatomical object based on the image data and providing the result dataset based on the image data, wherein the result dataset has a dedicated map and/or at least one deformation parameter of the at least one inhomogeneously deforming region.

Abstract: A method for operating an X-ray facility for recording a three-dimensional (3D) image data set of a target area of a patient is provided. A recording arrangement including an X-ray detector and an X-ray source may be rotated about an axis of rotation for recording two-dimensional projection images based on the image data set. A model instance of a parameterizable patient model that is patient-specific and 3D is determined. Target area information describing the target area is determined in the model instance from default information. At least two at least partially different partial recording areas of the target area are determined from the target area information. The partial recording areas cover the target area along the axis of rotation. One projection image set is recorded for each of the partial recording areas, and the image data set is reconstructed from the projection image sets.

Abstract: A 3D mesh of a person shall be reconstructed based on one single 2D image. For this purpose, 2D vertex projections and 3D vertex projections of the person are predicted based on the single 2D image. An approximated pose is estimated from the 3D vertex projections. The shape and/or pose, i.e. the 3D mesh of the person, is computed from the predicted 2D vertex projections and from the approximated pose by using a pregiven camera model and an articulated 3D mesh model of a human body.

Abstract: Angiographic recordings are to be made more informative. To this end, a method for spatiotemporal fusion of time-resolved angiographic data sets is proposed. Respective 4D reconstructions are obtained from angiographic 3D data sets acquired from contrast agents administered at different sites. In both 4D reconstructions, a common vascular region is identified. For each contrast agent bolus, the corresponding time point or time course in the common vascular region is determined. Finally, the two 4D reconstructions are synchronized and fused.

Abstract: The disclosure relates to a computer-implemented method for determination of a bone cement volume of a bone cement for a percutaneous vertebroplasty, which reduces complications due to the information provided by the method. The computer-implemented method includes: reading in or receiving data about a bone structure of a bone section; determining a bone density distribution of the bone section depending on the data; determining a bone space in the bone section depending on the determined bone density distribution, wherein a bone density of the bone space is less than a predetermined density threshold value; determining a bone space volume of the determined bone space; and determining and outputting the bone cement volume depending on the determined bone space volume.

Abstract: A computer-implemented method for providing a vascular image data record includes receiving a plurality of projection-X-ray images recorded in temporal succession. The plurality of projection-X-ray images at least partially map a common examination region of an examination object. The plurality of projection-X-ray images map a temporal change in the examination region of the examination object. A change image data record is determined in each case based on at least one region of interest of the plurality of projection-X-ray images. The at least one region of interest includes a plurality of image points. The change image data record in each case includes a time-intensity curve for each of the image points. The vascular image data record is generated based on the change image data record, and the vascular image data record is provided.

Abstract: A method for providing at least one procedure parameter includes acquiring at least one intraprocedural projection map that maps a hollow organ of an examination object with at least one medical object positioned in the hollow organ. A trained function is applied to the at least one intraprocedural projection map as input data. At least one parameter of the trained function is adjusted based on a simulation of a virtual positioning of at least one medical training object in a training hollow organ and of hemodynamics in the training hollow organ that are influenced by the at least one medical training object. The at least one procedure parameter is provided as output data of the trained function. The at least one procedure parameter includes a movement specification for the at least one medical object.

Abstract: A method is for determining a three-dimensional image dataset. In an embodiment, the method includes a first X-ray dataset of the examination volume being received, the first X-ray dataset including a two-dimensional first X-ray projection of the examination volume with respect to a first projection direction; and a second X-ray dataset of the examination volume being received, the second X-ray dataset including a second two-dimensional X-ray projection of the examination volume with respect to a second projection direction. Furthermore, a first three-dimensional image dataset of the examination volume is determined based on the two-dimensional first X-ray projection and the two-dimensional second X-ray projection. An effect of overlaps of vessels with respect to the first projection direction or the second projection direction can be reduced as a result of determining the first three-dimensional image dataset based on the first X-ray dataset and the second X-ray dataset.

Abstract: A method for providing a result data set includes: acquiring a medical image data set of an object under examination that maps a change in the object under examination on a time-resolved basis, wherein the change starts and/or ends at different locations and at least partially different points in time within the object under examination. The method further includes identifying a spatiotemporal subregion in the image data set that maps the change in a region of interest of the object under examination, wherein the subregion is delimited spatially by the mapping of the region of interest and temporally by the earliest start and/or the latest end of the change mapped at the locations within the region of interest. The method further includes providing a result data set based on the subregion of the image data set, wherein the result data set maps the region of interest on a time-resolved basis.

Abstract: A method for evaluating image data of a patient showing a target region to be treated with an embolizing agent includes providing a three-dimensional time-resolved image data set of a vascular system portion of the patient. A structural parameter that describes a geometry of at least the vascular system portion and/or a basic information item including dynamic parameters that describe hemodynamics in the vascular system portion is established from the image data set by an analysis algorithm. An embolization information item describing a plurality of embolizing agents that are to be used is provided. An actuation information item describing a suitable composition of the plurality of embolizing agents, for an intervention facility used for carrying out the treatment is established by an establishing algorithm that uses the basic information item and the embolization information item, and the actuation information item is provided to the intervention facility.