Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V.

Mahle International Gmbh

Universität Des Saarlandes

Steven Oeckl

Theobald Fuchs

Holger Schnell

Tobias Schön

Ioannis Papadopoulos

Alfred K Louis

Werner Schön

Gustav Müller

Christian Kretzer

Gabriel Herl

Alfred Louis

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&#x2212;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. The determined trajectory functions are transformed to a frequency domain of dimension n and the projection data are evaluated by means of the transformed trajectory functions.

Method and evaluation device for evaluating projection data of an object being examined

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.

Method and evaluation device for determining the position of a structure located in an object to be examined by means of X-ray computer tomography

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Erlangen, Germany

Steven Oeckl