Abstract: To allow safe treatment of a patient, in particular a puncture or biopsy using a needle, a 2D sectional image of an implant plane and a further 2D sectional image of an orthogonal plane are generated from a 3D image data record of a region to be examined. The two planes are hereby oriented such that the needle is on the one hand located within the implant plane and on the other hand is oriented in a perpendicular manner in respect of the orthogonal plane. The parallel display of the 2D images allows the doctor to acquire the relative position of the needle in relation to the region to be examined in a simple and intuitive manner.

Abstract: The invention relates to a method and a device for determination of an optimum direction of projection or position for recording a number of two-dimensional projection images of an object of interest, with the two-dimensional projection images being recorded by rotation or translation of an imaging system around the object. Inventively the process is as follows: a) estimating a position of the object at a point in time; b) determining at least one optimum imaging view from which the optimum direction of projection and/or position is produced, for the position estimated under a) with the aid of previously determined measurement. Preferably the measurement is expressed as a function of a transformation which is described by a spatial object-imaging system relationship.

Abstract: A three-dimensional volume data record contains a vascular tree. A two-dimensional projection image is an image of an actual fill state, to which the vascular tree is filled with a contrast agent at an acquisition time. The volume data record and the projection image are registered in relation to one another by means of the set of imaging parameters. A computation facility determines an expected target fill state, which describes which parts of the vascular tree should be filled with contrast agent at acquisition time in the three-dimensional volume data record. The computation facility determines the set of imaging parameters based on the target fill state and the projection image.

Abstract: The invention relates to a method for displaying 3D structures in 2D projection images, with which the 3D structures are present as individual volumetric gray scale values, such as are supplied in particular as a result of volumetric scans with a number of sectional planes of medical tomographs, with which changes to the direction of the surface standards of the 3D structures in respect of the observation direction of the 2D projection images are characterized by the changes in the properties of the illustrated 3D structures. Methods of this type are used to display so-called vascular trees or vascular structures from a 3D data record for instance.

Abstract: The invention relates to a method for determining a probability distribution with local three-dimensional resolution for a substance in a vascular system. An acquisition time is assigned to a group of x-ray images showing a presence distribution with local 2D resolution for a substance in the vascular system at the acquisition time. A first preliminary presence probability distribution is determined using the x-ray images assigned to the acquisition time and a volume data set of the vascular system. A second preliminary presence probability distribution is determined using the presence probability distribution for the preceding acquisition time and a migration probability distribution with the substance migrating from first vascular locations to second vascular locations. A high individual probability to vascular locations is assigned if both preliminary presence probability distributions have a high probability value for the respective vascular location.

Abstract: The invention relates to a method for operating an x-ray diagnostics device having an x-ray source, an x-ray image detector and an image system for generating a subtraction angiography sequence, in which a subtraction angiography sequence of low resolution individual images containing moving structures is created, registration of the individual images one with another is performed, and the images in the subtraction angiography sequence are used to compute a high resolution image.

Abstract: The invention relates to a method for operating an X-ray diagnostic device with an X-ray source and an X-ray image detector with a sequence of images of low resolution single pictures with systems of coordinates that are different from each other being created, a harmonization of systems of coordinates of images being carried out, and finally a high resolution image being calculated from the images.

Abstract: A computer receives a volume data set describing a vascular system with local three-dimensional resolution and a temporal sequence of groups of x-ray images. An acquisition time is assigned to each group of x-ray images comprising at least one x-ray image. Each x-ray image shows an actual presence distribution with local two-dimensional resolution for a substance in the vascular system, as defined at the respective acquisition time. The computer uses an initial presence distribution with local three-dimensional resolution for the substance, as defined for a start time, to determine further presence distributions with local three-dimensional resolution for the substance automatically for determination times by iterative resolution of fluid dynamics movement equations, which are per se location-independent. It automatically corrects the further presence distributions, if their respective determination time corresponds to one of the acquisition times, based on the temporally corresponding group of x-ray images.

Abstract: The invention relates to a method and an apparatus for reconstructing a three-dimensional image volume from two-dimensional projection images of a subject which have been taken from different projection directions by rotating the recording system around the subject, wherein the grayscale values of the voxels of the image volume are calculated by back projection of the projection images. The invention is characterized in that prior to back projection at least one projection image is modified in such a way that it corresponds to a projection image taken with a virtual detector whose axes are aligned parallel to the rotational axis of the recording system.

Abstract: The invention relates to a method, which assists the doctor in orientation in 2D fluoroscopy images. The invention relates to a method for contour visualization of regions of interest in fluoroscopy images by: firstly generating a 3D raw data set comprising at least one region of interest in which the contour of the at least one region of interest is visible, secondly generating a segmented 3D data set from the 3D raw data set in which the contour in at least one region of interest is clearly delimited, thirdly generating a 2D fluoroscopy image which contains the at least one region of interest, fourthly generating a 2D projection from the segmented 3D data set which is congruent with the 2D fluoroscopy image, fifthly determining the optionally approximated contour of the at least one region of interest in the 2D projection, and finally overlaying the contour with the 2D fluoroscopy image.

Abstract: The invention relates to a method for operating an x-ray diagnostics device having an x-ray source and an x-ray image detector, between which the distance can be adjusted, with an image sequence of low resolution images being provided with a different distance, an adjustment of the coordinates systems of the images being carried out and a high resolution image being calculated from the images. A method for generating high resolution x-ray recordings is achieved here by means of a C-arm system, a so-called C-arm superresolution image.

Abstract: The invention relates to a method and a device for determination of an optimum direction of projection or position for recording a number of two-dimensional projection images of an object of interest, with the two-dimensional projection images being recorded by rotation or translation of an imaging system around the object. Inventively the process is as follows: a) estimating a position of the object at a point in time; b) determining at least one optimum imaging view from which the optimum direction of projection and/or position is produced, for the position estimated under a) with the aid of previously determined measurement. Preferably the measurement is expressed as a function of a transformation which is described by a spatial object-imaging system relationship.

Abstract: A three-dimensional volume data record contains a vascular tree. A two-dimensional projection image is an image of an actual fill state, to which the vascular tree is filled with a contrast agent at an acquisition time. The volume data record and the projection image are registered in relation to one another by means of the set of imaging parameters. A computation facility determines an expected target fill state, which describes which parts of the vascular tree should be filled with contrast agent at acquisition time in the three-dimensional volume data record. The computation facility determines the set of imaging parameters based on the target fill state and the projection image.

Abstract: A computer receives a volume data set describing a vascular system with local three-dimensional resolution and a temporal sequence of groups of x-ray images. An acquisition time is assigned to each group of x-ray images comprising at least one x-ray image. Each x-ray image shows an actual presence distribution with local two-dimensional resolution for a substance in the vascular system, as defined at the respective acquisition time. The computer uses an initial presence distribution with local three-dimensional resolution for the substance, as defined for a start time, to determine further presence distributions with local three-dimensional resolution for the substance automatically for determination times by iterative resolution of fluid dynamics movement equations, which are per se location-independent. It automatically corrects the further presence distributions, if their respective determination time corresponds to one of the acquisition times, based on the temporally corresponding group of x-ray images.

Abstract: The invention relates to a method for determining a probability distribution with local three-dimensional resolution for a substance in a vascular system. An acquisition time is assigned to a group of x-ray images showing a presence distribution with local 2D resolution for a substance in the vascular system at the acquisition time. A first preliminary presence probability distribution is determined using the x-ray images assigned to the acquisition time and a volume data set of the vascular system. A second preliminary presence probability distribution is determined using the presence probability distribution for the preceding acquisition time and a migration probability distribution with the substance migrating from first vascular locations to second vascular locations. A high individual probability to vascular locations is assigned if both preliminary presence probability distributions have a high probability value for the respective vascular location.

Abstract: The invention relates to a method for displaying 3D structures in 2D projection images, with which the 3D structures are present as individual volumetric gray scale values, such as are supplied in particular as a result of volumetric scans with a number of sectional planes of medical tomographs, with which changes to the direction of the surface standards of the 3D structures in respect of the observation direction of the 2D projection images are characterized by the changes in the properties of the illustrated 3D structures. Methods of this type are used to display so-called vascular trees or vascular structures from a 3D data record for instance.

Abstract: The invention relates to a method for operating an x-ray diagnostics device having an x-ray source, an x-ray image detector and an image system for generating a subtraction angiography sequence, in which a subtraction angiography sequence of low resolution individual images containing moving structures is created, registration of the individual images one with another is performed, and the images in the subtraction angiography sequence are used to compute a high resolution image.

Abstract: The invention relates to a method for presenting a number of two- or three-dimensional images from different modalities registered with each other, with points of interest being able to be assigned to an individual image of the modalities and in all images selectable graphics primitives being overlaid on the assigned points of interest so that a visual assignment of points of interest or area of interest between simultaneously displayed two- or three-dimensional images occurs, as well as an imaging system of a workstation for executing the method.

Abstract: The invention relates to a method for operating an X-ray diagnostic device with an X-ray source and an X-ray image detector with a sequence of images of low resolution single pictures with systems of coordinates that are different from each other being created, a harmonization of systems of coordinates of images being carried out, and finally a high resolution image being calculated from the images.

Abstract: The invention relates to a method and a device for displaying a device inserted into a vascular system, in particular a medical instrument, in a 3-D volumetric data set by creating 2-D fluoroscopic images of the device, wherein information is integrated recursively from consecutive 2-D fluoroscopic images of the device into previous information or previous knowledge about the 3-D positions, wherein information is determined from the 3-D volumetric data set as to which 3-D positions are plausible for the device, and that because of the information from the previous information or knowledge and the determinations, the currently possible position of the device is superimposed on the image of the 3-D volumetric data set.