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

Universität Des Saarlandes

Tobias Schön

Randolf Hanke

Theobald Fuchs

Steven Oeckl

Michael Maisl

Stefan Kasperl

Alfred K Louis

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 an X-ray computer tomograph and a method for examining a component by means of X-ray computer tomography, the component carries out a movement relative to a radiation source detector unit in at least two degrees of freedom of movement, so at least one trajectory can be produced which spans a three-dimensional space. Since the X-radiation has a three-dimensional radiation geometry, volume data can be rapidly obtained and precisely reconstructed to form a three-dimensional X-ray image. The component can be geometrically measured by means of a geometry detection unit.

X-ray computer tomograph and method for investigating a component by means of X-ray computer tomography

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Nürnberg, Germany

Tobias Schön