Patent ID: 9042624
Filing Date: 2015-05-26
Classification: G06T

Abstract:
1. A method of reducing artifacts resulting from unrecorded, stochastically distributed movements of a radiation source and/or a radiation detector and/or an object during a scanning of the object, wherein the artifacts occur when a three-dimensional image dataset is reconstructed from two-dimensional projection images acquired from mutually different projection directions by way of an image acquisition arrangement having the radiation source and the radiation detector, and wherein geometric parameters describing an acquisition geometry for each projection image are taken into account during the reconstruction of the three-dimensional image dataset, the method which comprises performing the following correction steps: subjecting the projection images to a first filter for determining a set of filtered first intermediate images; subjecting the projection images to a second filter combining a ramp filter and the first filter, reconstructing a three-dimensional reconstruction dataset from the projection images after filtering by the second filter, and applying a forward projection in the projection directions and determining a set of second intermediate images; comparing a respective first intermediate image with a second intermediate image, for determining displacement information for each projection direction; and adjusting the geometric parameters in dependence on the displacement information.