Abstract: The invention relates to a tomography system (TA) comprising a first (QD1) and a second (QD2) beam source-detector pair for capturing one series (A1, A2) of projection image data sets (PB1, PB2) each from one projection angle (W1, W2) each and a volume image production system (VE) for producing a series (AV) of volume images (VB) of a vascular system (GS) while taking into account first confidence values (VW1) of the first pixel values (PW1) and/or while taking into account second confidence values (VW2) of the second pixel values (PW2). The confidence value (VW1, VW2) of a pixel value (PW1, PW2) depends on a pixel-specific traversing length (L) that a projection beam (PS1, PS2) traverses on a path through parts (Gi) of the vascular system (GS) from the first (Q1) or the second (Q2) beam source to a pixel-specific sensor element (S) of the associated first (D1) or second (D2) detector.

Abstract: The disclosure relates to a device and a method for ascertaining at least one individual fluid-dynamic characteristic parameter of a stenosis in a vascular segment having a plurality of serial stenoses, wherein angiography image data of the vascular segment is received from an angiography recording device, geometry data of the vascular segment is ascertained by an analysis device based on the angiography image data and combined into a segment model. At least one division point located between two of the stenoses respectively is ascertained by a dividing device in the segment model, the segment model is subdivided into subsegment models at each of the at least one division points, and the respective fluid-dynamic characteristic parameter is ascertained by a simulation device for at least one of the subsegment models based on respective geometry data of the subsegment model.

Abstract: The invention relates to a tomography system (TA) comprising a first (QD1) and a second (QD2) beam source-detector pair for capturing one series (A1, A2) of projection image data sets (PB1, PB2) each from one projection angle (W1, W2) each and a volume image production system (VE) for producing a series (AV) of volume images (VB) of a vascular system (GS) while taking into account first confidence values (VW1) of the first pixel values (PW1) and/or while taking into account second confidence values (VW2) of the second pixel values (PW2). The confidence value (VW1, VW2) of a pixel value (PW1, PW2) depends on a pixel-specific traversing length (L) that a projection beam (PS1, PS2) traverses on a path through parts (Gi) of the vascular system (GS) from the first (Q1) or the second (Q2) beam source to a pixel-specific sensor element (S) of the associated first (D1) or second (D2) detector.

Abstract: In an angiographic examination method to implement rotational angiographies, two x-ray projections of the examination subject are acquired from different acquisition angles, the x-ray projections are segmented to generate the outer contours of the examination subject in both x-ray projections, the outer contours of the examination subject are discretized in both x-ray projections, the coordinates of the focal points of the examination subject are calculated from these discrete points in both x-ray projections, the deviations of the coordinates of the focal points of the examination subject are determined, the deviations of the coordinates are evaluated, and the results of the evaluation are emitted as an output.

Abstract: The disclosure relates to a device and a method for ascertaining at least one individual fluid-dynamic characteristic parameter of a stenosis in a vascular segment having a plurality of serial stenoses, wherein angiography image data of the vascular segment is received from an angiography recording device, geometry data of the vascular segment is ascertained by an analysis device based on the angiography image data and combined into a segment model. At least one division point located between two of the stenoses respectively is ascertained by a dividing device in the segment model, the segment model is subdivided into subsegment models at each of the at least one division points, and the respective fluid-dynamic characteristic parameter is ascertained by a simulation device for at least one of the subsegment models based on respective geometry data of the subsegment model.

Abstract: The invention relates to an image system and a method for supporting the navigation of interventional tools when performing imaging controlled minimally invasive interventions within the body of a patient in a predetermined intervention plane, which serves to improve the precision and reliability of interventional accesses that are required for performing a histological tissue sample removal under CT or MRT based image-oriented monitoring, or in the context of tumor therapy or pain therapy. Directional deviations, away from the intervention plane, of the actual course of an interventional tool from a predeterminable desired course are captured and presented for display by registering the shortened represented total length or a shortened represented partial length of this interventional tool in the 2D projection representation of a fluoroscopic radioscopy recording that was recorded in a 2D projection direction running normally relative to the intervention plane.

Abstract: Systems and methods for treating an ischemic stroke are provided. In one aspect, a non-contrast scan is performed on a patient with a C-arm computed tomography (CT) imaging device in an interventional suite. A contrast agent is injected into the patient. A plurality of contrast scans is performed on the patient with the C-arm CT imaging device. Three-dimensional vascular images are reconstructed using the non-contrast scan and the plurality of contrast scans. A location of an ischemic stroke is determined from the reconstructed three-dimensional data sets and calculation of cerebral blood flow, mass transit time, time to peak, or a combination thereof. The ischemic stroke is treated in the interventional suite.

Abstract: A method for guiding nanoparticles to a target location by a magnetic gradient field and/or holding them at the target location is proposed. The magnetic gradient field is generated by a magnet system with at least one magnet. A focus of the magnet system is registered with an X-ray device. At least one three-dimensional image dataset showing the target location is captured by the X-ray device. The position of the target location is determined manually and/or automatically in the image dataset or in an image dataset determined therefrom and is positioned automatically based on the registration of the focus so that the focus coincides with the position of the target location.

Abstract: In an angiographic examination method to implement rotational angiographies, two x-ray projections of the examination subject are acquired from different acquisition angles, the x-ray projections are segmented to generate the outer contours of the examination subject in both x-ray projections, the outer contours of the examination subject are discretized in both x-ray projections, the coordinates of the focal points of the examination subject are calculated from these discrete points in both x-ray projections, the deviations of the coordinates of the focal points of the examination subject are determined, the deviations of the coordinates are evaluated, and the results of the evaluation are emitted as an output.

Abstract: An angiographic method is provided. The method includes: identification of a relevant part in acquired angiography 4D sequences which exhibit a vascular disorder or change; determination of a centerline for the part; ascertainment of lines parallel and surrounding the centerline; specification of perpendicular cross-sections; determination of voxels; ascertainment of bolus curves as a function of time for each voxel; which intersects one of the cross-sections; determination of a time for each voxel; measurement of the true Euclidean distance between voxels at the positions along the centerline and the parallel lines; division of the measured distance by the time difference; determination of second speed components, running transversely, proportional to the relative change in mass for each voxel; and calculation of the blood flow in the relevant part of the vascular system on the basis of the speed components.

Abstract: A method for acquiring a 3D image dataset for an image object based on a plurality of 2D image datasets relating to the image object is proposed. A scattered radiation is taken into account in an acquisition operator used in the method for the optimum reconstruction of the 3D image dataset. The acquisition operator should be as close as possible to the real mapping operator.

Abstract: An imaging method for enhanced visualization of vessels in an examination region of a patient, in particular during an intervention, is proposed. A 3D reconstruction image of the examination region is generated using a preoperatively recorded 3D image dataset of the examination region. At least one current 2D fluorescence image of the examination region is recorded by a fluorescence angiography. The vessels are identified. The 3D image dataset with the image dataset of the 2D fluorescence or ultrasound image is registered based on the result of the identification. The 3D reconstruction image and the 2D image are overplayed. The overlaid images are 3D played back.

Abstract: The invention is directed to a method and a device for separate three-dimensional presentation of arteries and/or veins of a vessel system in a part of the body of a vertebrate by a rotation computer tomography. A masking run of the tomograph is undertaken without contrast media around the part of the body. Then two filling runs with contrast media are executed, with the venous phase of vessel contrasting during the first filling run occurring during the arterial phase of vessel contrasting of the second filling run and vice-versa. The data from the first and second filling run is combined into data sets from the arterial or the venous phases of the vessel contrasting of the filling runs. The data of the masking run is subtracted from the combined data sets to obtain final data sets for a three-dimensional presentation of the arterial or the venous vessel system.

Abstract: An angiographic method is provided. The method includes: identification of a relevant part in acquired angiography 4D sequences which exhibit a vascular disorder or change; determination of a centerline for the part; ascertainment of lines parallel and surrounding the centerline; specification of perpendicular cross-sections; determination of voxels; ascertainment of bolus curves as a function of time for each voxel; which intersects one of the cross-sections; determination of a time for each voxel; measurement of the true Euclidean distance between voxels at the positions along the centerline and the parallel lines; division of the measured distance by the time difference; determination of second speed components, running transversely, proportional to the relative change in mass for each voxel; and calculation of the blood flow in the relevant part of the vascular system on the basis of the speed components.

Abstract: A method is proposed for collimating an off-center sub-object of an examination subject by a collimator of an X-ray diagnostic apparatus. The apparatus has a computed tomography imaging system having a first X-ray source and a computed tomography X-ray detector disposed opposite the first X-ray source having a number of individual detectors and an angiographic imaging system having a second X-ray source offset to the first X-ray source and a flat panel X-ray detector disposed opposite the second X-ray source with matrix shaped pixel elements. A 3D image of the subject is taken by the CT imaging system. The off-center sub-object is selected based on the 3D image. The position of the sub-object is determined for a shooting position of the angiographic imaging system according to the fixed relative disposition between the angiographic imaging system and the CT imaging system. The collimator is adjusted accordingly for collimating the off-center section.

Abstract: An imaging method for representing results of intravascular imaging (IVB) and CFD results of plaques of a vascular vessel tree of a patient and an imaging medical system for execution of the method are proposed. A 3-D image data set of the area under examination is acquired with x-ray beams for the generation of 3-D x-ray images. A 3-D reconstruction image of the area under examination is generated from the 3-D x-ray images. IVB images are generated by intravascular imaging. Larger calcified plaques in the 3-D x-ray images and IVB images are identified for determining orientation points or landmarks. The spatial position of the plaques are correlated and/or registered based on the orientation points or landmarks. The IVB image data and 3-D image data are fused and reproduced.

Abstract: The invention relates to a method and a device for making correction information for correcting a guidance direction of an instrument. Based on a current position of the tip of the instrument and the current guidance direction of the instrument and the position of a target point in an object, a first straight line indicating the current guidance direction and a second straight line defined by the tip of the instrument and the target point in the object are determined. The second straight line intersects the first straight line and indicates the desired guidance direction. Based on the position of the first and second straight lines relative to one another, a digital item of correction information is specified, wherein the correction image has a correction diagram located in a plane in the perspective of the current guidance direction of the instrument.

Abstract: In a method and apparatus for optically-based acquisition of slice images from a vessel of a subject, and for combining the slice images to provide an intuitively recognizable visualization of a pathology in the vessel, slice images of the vessel are acquired during pullback of an optical probe of the optically-based slice imaging system, while simultaneously acquiring an ECG signal from the subject. The slice images and the ECG signal are registered, and slice images acquired at a selected cardiac phase are combined into a scene. The slice images in the scene are subjected to a first data transformation to shift the vessel midpoint in each slice image to the image center of each slice image. After the first data transformation, the slice images in the scene are subjected to a second data transformation to produce the visualization. The second transformation, for example, can be a curved planar reformation to allow the vessel to be shown in longitudinal section.

Abstract: A method for determining a four-dimensional angiography dataset describing the flow of contrast agent over time through a blood vessel system of the body of a patient is provided. Four-dimensional flow information is obtained from two-dimensional images captured in a capture time period in different projection directions using a biplanar x-ray device in an inflow phase and/or an outflow phase of the contrast agent by back projection of the images. A three-dimensional reconstruction dataset is determined from the projection of the images depending on the flow information during a filling phase in which the contrast agent is present evenly distributed in the blood vessel system. The three-dimensional reconstruction dataset is animated in order to determine the angiography dataset. The capture time periods for the inflow phase and/or the outflow phase are determined from images captured of a test bolus.

Abstract: A method and system for intraoperative guidance in an off-pump mitral valve repair procedure is disclosed. A plurality of patient-specific models of the mitral valve are generated, each from pre-operative image data obtained using a separate imaging modality. The pre-operative image data from the separate imaging modalities are fused into a common coordinate system by registering the plurality of patient-specific models. A model of the mitral valve is estimated in real-time in intraoperative image data using a fused physiological prior resulting from the registering of the plurality of patient-specific models.