Abstract: In a method and an evaluation device for the evaluation of projection data of an object being examined, which are determined along a trajectory in a multiplicity of projection positions relative to a co-ordinate origin, a particular trajectory function is determined for the projection positions, for each of a multiplicity of positions from a reconstruction region of dimension n by establishing an offset (d) and a direction vector at the co-ordinate origin, establishing a hyperplane of dimension n?1 which runs perpendicular to the direction vector and has an offset to the co-ordinate origin, establishing a number of intersection points where the hyperplane intersects the trajectory, establishing a derivative vector of the trajectory according to its trajectory path and calculating the derivative vector in the projection position, and establishing an absolute value of a scalar product between the derivative vector and the position and dividing the absolute value by the number.

Abstract: In a method and an evaluation device for the evaluation of projection data of an object being examined, which are determined along a trajectory in a multiplicity of projection positions relative to a co-ordinate origin, a particular trajectory function is determined for the projection positions, for each of a multiplicity of positions from a reconstruction region of dimension n by establishing an offset (d) and a direction vector at the co-ordinate origin, establishing a hyperplane of dimension n?1 which runs perpendicular to the direction vector and has an offset to the co-ordinate origin, establishing a number of intersection points where the hyperplane intersects the trajectory, establishing a derivative vector of the trajectory according to its trajectory path and calculating the derivative vector in the projection position, and establishing an absolute value of a scalar product between the derivative vector and the position and dividing the absolute value by the number.

Abstract: In a method and an evaluation device for determining the position of a structure located in an object to be investigated by means of X-ray computer tomography, a cutting data record, which images the object in a cutting plane, is determined from a volume data record of the object. The cutting data record is binarized to form a binary data record, in which the structure voxels imaging the structure and the surface voxels imaging an object surface are determined. To determine the position, a distance data record is produced in such a way that a distance value, which characterizes the smallest distance of the respective distance voxel from the surface voxels, is assigned to each distance voxel of the distance data record. The distance voxels corresponding to the structure voxels are then determined and the associated distance values evaluated.

Abstract: In a method and an evaluation device for determining the position of a structure located in an object to be investigated by means of X-ray computer tomography, a cutting data record, which images the object in a cutting plane, is determined from a volume data record of the object. The cutting data record is binarized to form a binary data record, in which the structure voxels imaging the structure and the surface voxels imaging an object surface are determined. To determine the position, a distance data record is produced in such a way that a distance value, which characterizes the smallest distance of the respective distance voxel from the surface voxels, is assigned to each distance voxel of the distance data record. The distance voxels corresponding to the structure voxels are then determined and the associated distance values evaluated.

Abstract: A CT reconstruction of an object including a high-resolution object region of interest may be produced in an artefact-free manner by producing a first projection data set of a first region of the object that encloses the object region of interest and includes at least one projection recording of a first resolution, and a second projection data set of the object region of interest including at least a second projection recording of a second, higher resolution. The first and second projection data sets may be combined, in accordance with a combination rule, so as to obtain a CT reconstruction of the first region of the object having the first resolution and of the object region of interest having the second, higher resolution.

Abstract: An apparatus for evaluating a state of an object includes a means for providing a three-dimensional representation of the object including information about the state to be evaluated. The three-dimensional representation is then subdivided into a plurality of sub-areas that are subsequently evaluated sub-area by sub-area, namely by two-dimensionally examining each sub-area of the plurality of sub-areas, in order to ascertain data about a place in a sub-area at which the state deviates from a default state. A three-dimensional connection analysis using the data about the places from the individual sub-areas provides a three-dimensional description of a three-dimensional place whose state deviates from the default state. By splitting up the three-dimensional representation into several sub-areas that may be analyzed two-dimensionally, powerful image processing algorithms may be employed. The three-dimensionality is then again achieved by means of a connection analysis of the two-dimensional data.